| Expanding the Availability of Lightweight Aluminum Alloy Armor Plate Procured From Detailed Military Specifications |
Jul 2012 |
12 pages |
| Authors:
Kevin Doherty; Richard Squillacioti; Bryan Cheeseman; Brian Placzankis; Denver Gallardy; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
 | For many years, the range of aluminum alloys for armor plate applications obtainable in accordance with detailed military specifications was very limited. However, the development of improved aluminum alloys for aerospace and other applications has provided an opportunity to modernize the Army portfolio for ground vehicle armor applications. While the benefits of offering additional alloy choices to vehicle designers is obvious, the process of creating detailed military specifications for armor ... |
|
| A Study on the Role of Grain-Boundary Engineering in Promoting High-Cycle Fatigue Resistance and Improving Reliability in Metallic Alloys for Propulsion Systems |
30 APR 2005 |
33 pages |
| Authors:
Robert O. Ritchie; Mukul Kumar; CALIFORNIA UNIV BERKELEY DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| High-cycle fatigue, involving the premature initiation and/or rapid propagation of small cracks to failure due to high-frequency (vibratory) loading, remains the principal cause of failures in military gas-turbine propulsion systems. The objective of this study is to examine whether the resistance to high-cycle fatigue failures can be enhanced by grain-boundary engineering, i.e., through the modification of the spatial distribution and topology of the grain boundaries in the microstructure. While grain-boundary ... |
|
| New Welding Consumables and Practice for Highly Portable Field Repair |
20 DEC 2001 |
31 pages |
| Authors:
D. L. Olson; COLORADO SCHOOL OF MINES GOLDEN CENTERFOR WELDING JOINING AND COATINGS RESEARCH
|
| New welding consumables and practice for weld repair and extended service life were investigated. Exothermally assisted arc welding was successfully accomplished with both SMA and self-shielded FCA welding consumables on steels and the optimum range of exothermic additions and welding parameters was determined Metal powder-filled core aluminum wires were produced which, on welding, promote grain refinement in aluminum weld deposits. Grain refinement in aluminum welds is directly related to weldability ... |
|
| Yes--This is Rocket Science: MMCs for Liquid Rocket Engines |
05 JUN 2001 |
49 pages |
| Authors:
J. S. Shelley; R. LeClaire; D. Miracle; J. Nichols; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| The Air Force's Integrated High-Payoff Rocket Propulsion Technologies (IHPRPT) Program has established aggressive goals for both improved performance and reduced cost of rocket engines and components. Achieving these goals relies on developing affordable Metal Matrix Composite (MMC) technologies for application to Liquid Rocket Engines (LREs). Efforts are being conducted on three types of MMCs: Aluminum, Copper, and Nickel matrix material systems. Potential applications include turbopump housings, rotating machinery, and high ... |
|
| Material Choices for Good Load Carriage Design |
MAY 2001 |
4 pages |
| Authors:
Gareth Davies; DEFENCE CLOTHING AND TEXTILES AGENCY ESSEX (UNITED KINGDOM)
|
| The paper discusses the selection of fabrics, webbing, tapes, sewing threads and the issues that surround their choice in the military scenario. How infrared signature is achieved on synthetic materials, so that service personnel are hidden from night sights, is explained. A weldable material has been identified in the UK offering the opportunity to produce waterproof rucksacks. The choice of interface materials to the body is discussed and the new ... |
|
| Carbon Equivalent (Pcm) Limits for Thick Carbon and Low Alloy Steels |
04 APR 2000 |
81 pages |
| Authors:
Jack H. Devletian; OREGON GRADUATE INST BEAVERTON
|
| Experimentally determined preheating/interpass temperatures necessary to prevent hydrogen-assisted cracking of restrained butt welds were established and compared to the best algorithms available to predict such cracking. Weldability tests on large-size plates of ABS & MIL-S-22698 Grades B D and DH-36 as well as ASTM A612 steels were conducted at Electric Boat Corporation using three different plate thicknesses three welding procedures and two levels of diffusible hydrogen. The plate thicknesses were ... |
|
| The Effect of Welding Consumables on Arc Welding Process Control and Weld Metal Structure and Properties |
15 JUN 1998 |
29 pages |
| Authors:
David L. Olson; Robert H. Frost; COLORADO SCHOOL OF MINES GOLDEN CENTERFOR WELDING JOINING AND COATINGS RESEARCH
|
| The effect of welding consumables on arc welding process control and weld metal structure and properties was investigated. The first study demonstrated the potential use of exothermically (thermite) assisting steel arc welding consumables for field repair welding. Both shielded metal arc (SMA) and flux cored arc (FCA) consumables were prepared to allow generation of chemical energy to supplement electrical energy during welding, allowing for welding with smaller or even no ... |
|
| The National Shipbuilding Research Program, Development and Evaluation of Improved Flux-Cored Welding Consumables, Phase 1 |
09 JAN 1998 |
36 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
|
| The objective of NSRP Project #7-95-4 is to evaluate and develop an improved flux-cored wire for use in commercial shipbuilding that can be produced within the U.S. and is comparable or exceeds those available from foreign producers. This report deals with a portion of the first phase consisting of evaluating FCAW wires from U.S. and foreign manufacturers to identify the differences in weldability, arc characteristics and quality. The electrode evaluation ... |
|
| Evaluation of Water-Thinned Preconstruction Primers Containing No Metal Pigments |
DEC 1997 |
141 pages |
| Authors:
Dwight L. Turner; Walter R. Mohn; PETERSON BUILDERS INC STURGEON BAY WI
|
| The primary goal of NSRP Project 3-95-3 was to identify and evaluate water-thinned preconstruction primers (PCP's) which could potentially be used as viable substitutes for conventional PCP's containing powdered zinc and high levels of volatile organic compounds (VOC's). The objectives of this 6-Task 17-month project were to compile a comprehensive list of commercially available water-thinned preconstruction primers (PCP's) which contain little or no hazardous metal and to evaluate the more ... |
|
| Improved Rolled Homogeneous Armor (IRHA) Steel Through Higher Hardness |
APR 97 |
66 pages |
| Authors:
Joseph Prifti; Michael Castro; Richard Squillacioti; Raymond Cellitti; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| An improved rolled homogeneous armor (IRHA) steel with enhanced ballistic performance has been developed. Increases in ballistic performance are attributed to higher hardness levels achieved by IRHA, which maintain adequate toughness and ductility. Through augmentation of a generic chemical composition for standard rolled homogeneous armor (RHA) material, and optimization of heat treatment, greater hardenability, and higher hardness levels were attained. The higher hardenability ensures that through-thickness hardness, with the desired ... |
|
| Optimized Design Parameters for Welded TMCP Steels |
27 FEB 97 |
272 pages |
| Authors:
L. Malik; R. Yee; B. Graville; A. Dinovitzer; FLEET TECHNOLOGY LTD KANATA (ONTARIO)
|
| In this report, data on the static strength, toughness, and fatigue properties of accelerated cooled TMCP steels and their weldments have been compiled from various sources. Potential for advantageous application in ship structure design has been examined. Fabrication characteristics of the TMCP steels, mainly weldability and line heating, are also briefly reviewed. Tensile test data indicates that the yield to tensile ratio of the accelerated cooled TMCP steels tends to ... |
|
| Improved Rolled Homogeneous Armor (IRHA) |
MAR 96 |
39 pages |
| Authors:
R. B. Leavy; DYNAMIC SCIENCE INC ABERDEEN MD
|
| This report describes tests conducted on an enhanced conventional armor steel. The improved rolled homogeneous armor (IRHA) steel was designed to be harder than conventional rolled homogeneous armor (RHA), but maintain the same weight and weldability as RHA. This was accomplished through optimizing the alloy chemistry and heat treatment of the IRHA. The material was tested against a penetrator with a length-to diameter aspect ratio of 5 tungsten alloy slug ... |
|
| Thermoplastic Ribbon-Ply Bonding Model |
JAN 96 |
61 pages |
| Authors:
Jeffrey A. Hinkley; Joseph M. Marchello; Bernadette C. Messier; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| With thermoplastic matrix resins, on-line consolidation of continuous-fiber composite laminates offers the potential of eliminating the post-placement autoclave or oven curing step, thereby simplifying the process and reducing costs. The aim of the present work was to identify key variables in rapid weld-bonding of thermoplastic tow (ribbon) and their relationship to matrix polymer properties and to ribbon microstructure. Theoretical models for viscosity, establishment of ply-ply contact, instantaneous (Velcro) bonding, molecular ... |
|
| Optimum Weld-Metal Strength for High-Strength Steel Structures |
18 DEC 95 |
131 pages |
| Authors:
Robert J. Dexter; Matthew Ferrell; LEHIGH UNIV BETHLEHEM PA CENTER FOR ADVANCED TECHNOLOGY FOR LARGE STRUCTURAL SYSTEMS
|
| This report provides data and analysis to support the acceptance of undermatched welds in high-strength steel in shipbuilding. Wide-plate tensile tests made from HSLA-l00 steel plate (690 MPa minimum yield strength) with transverse groove welds demonstrated that moderately-undermatched joints (actual weld yield strength up to 12 percent less than actual base-plate yield strength) can achieve strength and ductility as high as overmatched welds. Welds undermatched between 18 and 28 percent ... |
|
| Index to Benet Laboratories Technical Reports - 1994 |
AUG 95 |
80 pages |
| Authors:
R. D. Neifeld; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| This is a compilation of technical reports published by Benet Laboratories during 1994. |
|
| Development of High Performance Steels for Bridge Construction |
AUG 95 |
37 pages |
| Authors:
Eric M. Focht; Thomas W. Montemarano; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
|
| High strength steels that are used in bridge construction (ASTM A709) have yield strengths in the 50 to 100 ksi range and allow for carbon levels to reach as high as 0.23 wt.%. For good weldability, the carbon content in HSLA steels used by the Navy is usually restricted to a maximum of 0.10 wt.%. The Navy is working with industry to develop new high performance steels for bridges with ... |
|
| Plastic Flow and Failure in HY100, HY130 and AF1410 Alloy Steels Under High Strain Rate and Impact Loading Conditions |
MAR 95 |
75 pages |
| Authors:
A. M. Rajendran; H. R. Last; R. K. Garrett Jr; ARMY RESEARCH LAB WATERTOWN MA MATERIALS DIRECTORATE
|
| This report presents the results from impact experiments, constitutive/failure modeling, and metallurgical failure analyses for three steels: HY100, HY130, and AF1410. The main objectives of this effort are: (1) to obtain fundamental engineering data in terms of stress-strain curves up to failure at different temperatures and strain rates, (2) to evaluate the observed differences in the macroscopic behaviors through microscopic metallurgical studies, and (3) to describe the flow and failure ... |
|
| Gordon Research Conference on Physical Metallurgy: "Materials by Design" Held in Plymouth, New Hampshire on August 2 - 6, 1993 |
19 JUL 94 |
4 pages |
| Authors:
Jerome B. Cohen; RHODE ISLAND UNIV KINGSTON
|
| The 1993 Physical Metallurgy Gordon Research Conference on 'Materials by Design' was held from 2 to 6 August, 1993 at Plymouth State College South, Plymouth NH, with J.B. Cohen and G.B. Olson of Northwestern University as chairmen. Eleven of the twenty-six speakers were from foreign countries, and the nearly 100 total participants showed a similar distribution. Overall, there was a healthy mixture of scientists and engineers from universities, national laboratories, ... |
|
| The Effects of Alloying Elements on the Strength and Cooling Rate Sensitivity of Ultra-Low Carbon Alloy Steel Weld Metals |
MAR 94 |
60 pages |
| Authors:
M. G. Vassilaros; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
|
| A study was conducted to evaluate the effect of weld cooling rate on the strength of autogenous GTAW deposited weld metal. The basic weld metal composition was based on a low carbon bainite metallurgical system. The weld metal yield strength goal was 130 ksi, needed to surpass the current HY-13O weld metal requirements. Vacuum Induction Melted (VIM) heats of steel were produced and processed into 3/4' thickness plates. The autogenous ... |
|
| The Quantitative Microstructural Characterization of Multipass TIG Ultra Low Carbon Bainitic Steel Weldments and Correlation with Mechanical Properties |
SEP 93 |
98 pages |
| Authors:
Daniel E. Butler; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL ENGINEERING
|
| The U.S. Navy has maintained a continuous research, development and certification program in ULCB steels as a possible replacement for the HY and HSLA steels currently being used in ship construction. The overall aim of this program is to develop a high strength steel with improved weldability. Improved weldability could eliminate the requirement of preheating, (a necessary and costly step required to prevent weld metal cracking in HY steels). The ... |
|
| Steel Structures for Civil Works, General Considerations for Design and Rehabilitation |
AUG 93 |
109 pages |
| Authors:
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
|
| Design, repair, or rehabilitation of structural steel elements for civil works projects may require knowledge in a multitude of specialties such as allowable stresses, finite element analysis, material selection, buckling, welding, corrosion, and fatigue. This report provides additional background, guidance, and references in many of these specialty areas to enhance the capabilities of design engineers. This report contains general considerations for structural design and repair of hydraulic steel structures on ... |
|
| Current Welding Consumables Research in the U. S. Navy |
MAR 93 |
67 pages |
| Authors:
J. J. DeLoach Jr.; G. L. Franke; M. G. Vassilaros; R. J. Wong; R. DeNale; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SURVIVABILITY STRUCTU RES AND MATERIALS DIRECTORATE
|
| One of the thrusts of U.S. Navy research is directed toward providing new and advanced material systems with improved properties, and developing methods and materials to construct current and future generation naval vessels more economically. It focuses on materials of construction, fabrication methods and consumables, and methods to ensure and enhance structural integrity. One specific area in this thrust is that of welding the Navy's high strength steels. Toward this ... |
|
| Factors Influencing the Microstructure and Mechanical Properties of Ultra Low Carbon Bainitic 100 Tungsten Inert Gas Multipass Weldments |
SEP 92 |
65 pages |
| Authors:
Eugene P. McDonald; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The U.S. Navy has maintained a continuous research, development and certification program in HSLA and ULCB steels with the intent of someday totally replacing the HY steels now used in ship construction. A major advantage in using HSLA and ULCB steels is their increase in weldability over the HY steels which now require large amounts of preheating to prevent crack formation in the heat affected zone. Up until the present ... |
|
| Factors Influencing the Microstructural and Mechanical Properties of ULCB Steel Weldments |
DEC 91 |
103 pages |
| Authors:
Paul F. McHale; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The U.S. Navy has maintained a continuous research, development and certification program in High Strength Low Alloy (HSLA) and Ultra Low Carbon Bainitic (ULCB) steels as a replacement for the HY steels used in ship construction. The major benefit of the HSLA and ULCB steels stems from the relative ease of weldability as compared with the HY steels which require large amounts of preheating to prevent weld metal crack formation. ... |
|
| Development of Low-Carbon, Copper-Strengthened HSLA Steel Plate for Naval Ship Construction |
JUN 90 |
23 pages |
| Authors:
Ernest J. Czyryca; DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT
|
| Modern warships designs require an increased utilization of high strength, alloy steel plate for weight reduction, stability, increased payload, and increased mobility. Naval ship structures are subjected to a complex spectrum of loads and service environments, and the structural steels and welding materials used in hull fabrication must demonstrate high fracture toughness for these extreme service conditions. The welding of HY-series hig |
|
| Carbon Equivalence and Weldability of Microalloyed Steels |
25 OCT 89 |
249 pages |
| Authors:
C. D. Lundin; T. P. Gill; C. Y. Qiao; Y. Wang; TENNESSEE UNIV KNOXVILLE WELDING RESEARCH AND ENGINEERING GROUP
|
| This effort sought to determine the validity of carbon equivalent formulae to predict weldability of low carbon microalloyed steels. The HAZ of a range of steels was characterized (HSLA 80-130, HY 130, DQ and AC types) and Yuriokas formula was found to be the most accurate in predicting HAZ hardness. The CE1 carbon equivalent formula was also found to most accurately predict hardenability except that the effect of copper is ... |
|
| Heat Treatment Investigation of 4330 Vanadium-Modified Steel |
AUG 89 |
17 pages |
| Authors:
Charles F. Hickey Jr.; David W. Dix; Mary E. O'Donovan; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| The shear pin material for the T5106 155-mm torsional impact round was originally specified to have been 4340 steel. It was determined by the authors that the required properties of an ultimate shear strength of 150 ksi and Charpy impact value of 20 ft-lb at 40 F were not obtainable in 4340. The decision to employ 4330 vanadium-modified steel as a substitute shear pin material initiated this heat treatment and ... |
|
| Evaluation of the Benefits of HSLA Steels |
MAR 1989 |
182 pages |
| Authors:
NEWPORT NEWS SHIPBUILDING AND DRY DOCK CO VA
|
| Bethlehem Steel proposed to SP-7 to conduct a study to evaluate the benefits of new higher strength low alloy (HSLA) steels. In Phases I and II, we would determine the ability of the new HSLA steels to withstand high welding heat inputs, without using sustained preheat, and have only limited heat zone degradation. Yield points to be attained were 80 ksi through 3 inches thick; 75 ksi through 5 inches ... |
|
| The Effect of Welding Process on the Microstructure of HY-130 Steel Weldments |
DEC 88 |
76 pages |
| Authors:
Teresa M. McNutt; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| HY-130 is a high-strength, low-carbon steel used in the quenched an d tempered condition. It is designed for high performance and marine applications where good weldability is a requirement. Optimum welding parameters are currently under investigation. In this study, 1/2 inch (12.7 mm) HY-130 steel weldments produced by submerged arc welding (SAW) and gas metal arc welding (GMAW) processes are compared by means of a systematic microstructural characterization of the ... |
|
| Stress Relief Cracking in Copper-Precipitation Strengthened HSLA-100 Steel |
DEC 88 |
98 pages |
| Authors:
Steven A. McNutt; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The U.S. Navy is currently developing a new family of high-strength. low-alloy steels which derive a significant portion of their strength from copper precipitation. These highly weldable steels require little or no preheat, resulting in substantial cost savings. The first of these steels, HSLA-80, has been certified for ship construction, but recent studies have indicated some susceptibility to stress relief cracking in weldments. HSLA-100, modification of HSLA-80, is now being ... |
|
| Influence of Process Parameters on Laser Weld Characteristics in Aluminum Alloys |
AUG 88 |
179 pages |
| Authors:
Nagesh Sonti; PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
|
| Multi-kilowatt CO2 lasers are increasingly being used for welding applications due to their capability of producing deep penetration welds at high welding speeds. Although most metals are being successfully welded, laser welding of aluminum alloys is proving to be difficult. Combination of high thermal diffusivity and optical reflectivity to CO2 laser radiation causes difficulty in coupling the laser energy to the material. Much higher laser intensities are required to ensure ... |
|
| Producibility Analysis of the Alternative Antitank Airframe Configuration (AATAC) Flex-Wing |
JUN 1988 |
115 pages |
| Authors:
Sam B. Wood; Richard W. Amos; Barbara J. Robertson; Harold R. Brewer; Susan D. Bowles; ARMY MISSILE COMMAND REDSTONE ARSENAL AL SYSTEMS ENGINEERING AND PRODUCTIONDIRECTORATE
|
| This report documents the results and findings of a two-year producibility analysis performed on the AATAC Flex-Wing. The first year's report analyzed material selection, manufacturing processes, and cost analysis for the wing design, wing clip, center fuselage, and the wing base of the AATAC Flex- Wing. The second year's report isolated its efforts on the wing design only. Material impact, cost analysis, drawing tolerance review, and manufacturing process changes were ... |
|
| Corrosive-Wear of Buoy Chain |
JAN 88 |
34 pages |
| Authors:
Richard R. Brown; Craig A. Kohler; COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT
|
| Five alloy steel chains were exposed to a service environment as buoy chains to determine the best candidate to replace the 1022 steel currently used. The best combination of resistance to material loss, strength and pitting corrosion resistance was shown by the 4340 quenched and tempered steel. In the chafe section the 4340 steel displayed the best resistance to wear even though it was located in rocks and sand. The ... |
|
| Development of a Constitutive Equation for HSLA (High-Strength Low- Alloy)-100 at Cryogenic Temperatures |
DEC 87 |
89 pages |
| Authors:
David M. Bissot; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| HSLA-100 is a 100ksi nominal yield strength steel being developed by the Navy for Naval shipbuilding applications. To assist in ductile and brittle failure modelling of this low carbon steel, tensile tests were conducted at temperatures ranging from 37 C(99 F)to liquid nitrogen(-196 C/-321 F)to determine a constituitive equation for this alloy at low temperature. The Hollomon Power Equation and the Voce Equation are used to describe the true stress/true ... |
|
| Effects of Sulfur Content on the Plain Strain Fracture Toughness of Inertia Welds in 4340 Steel |
SEP 87 |
|
| Authors:
William S. Ricci; Eric B. Kula; James D. Colgate; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
 | The plain strain fracture toughness of post-weld, reheat treated inertia welds in two heats of AISI 4340 steel of equivalent tensile properties, but different sulfur concentrations, was determined. The adverse reorientation of elongated sulfide inclusions in both heats, resultant from the forging stage of the welding cycle, caused reductions in ductility and toughness that were not remedied by reheat treatments. The percent elongation of inertia welded joints was found to ... |
|
| High Strength Steels Produced by Advanced Metallurgical Processes (The National Shipbuilding Research Program) |
AUG 1987 |
31 pages |
| Authors:
I. L. Stern; D. Y. Ku; R. F. Waite; M. Wheatcroft; W. Hanzalek; AMERICAN BUREAU OF SHIPPING PARAMUS NJ
|
| The immediate objective of this investigation was to explore the potential advantages of new high strength (65 to 120 ksi yield) steels produced by advanced steel making and on-line processing techniques for marine applications. A longer term objective is to facilitate the introduction to the shipbuilding industry of the new high strength steels processed by advanced on-line processing techniques with toughness and weldability properties beyond those currently available. The study ... |
|
| Investigation of the Stress Corrosion Cracking Susceptibility of Annealed and Heat Treated Alloy 625 Castings and Forgings in Sea Water |
JUN 87 |
|
| Authors:
Eric M. Jones; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN ENGINEERING
|
| Alloy 625, the nickel based superalloy commonly called Inconel 625, was investigated for its susceptibility to stress corrosion cracking in sea water using the slow strain rate tensile test method. Four microstructures of the alloy commonly found in end products were investigated. Bimetallic couplings with other metals were simulated with a potentiostat at plus and minus one volt with respect to a saturated standard calomel electrode (SCE). Baseline tests were ... |
|
| The Effect of Temperature on the Tensile Properties of HSLA-100 Steel |
JUN 87 |
115 pages |
| Authors:
James E. Hamilton; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| High Strength Low Alloy (HSLA) steels have been shown to posses high strength and toughness. Additionally, these steels can be welded without the normal preheating required by comparable HY-series steels. HSLA-100, 100 Ksi yield strength, contains increased amounts of copper, manganese and nickel over the currently certified HSLA-80. However, prior to use in Naval ship construction knowledge of the steels toughness behavior is necessary. Existing fracture mechanics models are not ... |
|
| Polarization Resistance Measurements of Copper Nickel Alloys in Seawater |
APR 86 |
|
| Authors:
C. M. Hanham; A. M. Quinn; DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)
|
| As a result of problems associated with the brazing of seawater piping systems on Canadian Forces surface ships, it has been proposed that future ships have welded systems. This proposal has necessitated the investigation of the properties and behavior of potential replacement weldable alloys for the nonweldable cast ASTM B61 leaded tin bronze presently used for fittings. In a previous investigation, cast chromium modified 70/30 copper nickel exhibited erosion corrosion ... |
|
| A Review of Titanium Welding Processes |
03 FEB 86 |
|
| Authors:
D. F. Hasson; NAVAL ACADEMY ANNAPOLIS MD DEPT OF MECHANICAL ENGINEERING
|
| The efficient and cost-effective utilization of conventional and advanced titanium alloys in structural applications has required the advanced development of several welding processes. These developments have been prompted to a great extent by the high reactivity of titanium as compared to other commonly-welded structural metals, but also by titanium's unique physical and metallurgical properties. This review discusses the current state-of-the-art of welding processes for titanium, concentrating on arc and beam ... |
|
| Vertical Junction Solar Cells |
20 DEC 85 |
|
| Authors:
SOLAREX CORP GAITHERSBURG MD AEROSPACE DIV
|
| The goal of this program was to develop and evaluate an acceptable coversliding technology for vertical junction solar cells. The technical program was divided into the following sub-tasks: 1.0. to fabricate 80 vertical junction cells of msot recent configuration for evaluation as individual samples and for test module assembly. 2.1. to develop a satisfactory method for coversliding V. J. cells to withstand deep thermal cycle in space. 2.2. to establish ... |
|
| Investigation of Steels for Improved Weldability in Ship Construction |
MAY 84 |
|
| Authors:
L. J. Cuddy; J. S. Lally; L. F. Porter; UNITED STATES STEEL CORP TECHNICAL CENTER MONROEVILLE PA
|
| This is the third and final phase of a multi-year effort aimed at investigating those factors which influence th microstructure in the Heat Affected Zone (HAZ) of economically produced ship plates with high yield strengths when subjected to high heat inputs such as electroslag and submerged arc welding. The Ship STructure Committee has published the first two phases as SSC-298 and SSC-305. |
|
| Investigation of Steels for Improved Weldability in Ship Construction |
MAY 84 |
|
| Authors:
L. J. Cuddy; J. S. Lally; L. F. Porter; UNITED STATES STEEL CORP MONROEVILLE PA
|
| The purpose of Phase III of this contract is to further develop ship plate steels following on the work done in Phase II. As the initial task of Phase III, the microstructures and properties produced in the heat affected zone (HAZ) of Phase II steels were re-evaluated. Addition of titanium to the base steel improved toughness of the HAZ by refining the austenite grain size and by changing transformation products ... |
|
| ESR Steels for Defence - State of the Art. MRL Seminar, held December 14, 1982 |
MAY 1983 |
|
| Authors:
R. J. O'Halloran; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
|
| A seminar was conducted at MRL at which various speakers gave presentations on the state of the art in defence uses of ESR steels. The ESR process was described and the local manufacturing facilities were detailed. The fatigue, fracture, weldability, machining and corrosion properties of ESR steels were outlined, andthe applications of ESR steels to the manufacture of armour and munitions were discussed. |
|
| Hydrogen in HY-130 Weld Metal. |
14 MAY 1979 |
|
| Authors:
Michael D. Hayes ; Daniel Hauser; BATTELLE COLUMBUS LABS OH
|
| This is the final report on a program designed to evaluate the potential for using rare-earth materials to getter hydrogen during welding. The end objective was to reduce the potential for hydrogen embrittlement in HY-130 steel welds. This report briefly summarizes work conducted during the first three years of the program, during which time several varieties of rare-earth containing-electrodes were produced. Cracking problems during drawing were encountered when rare-earth materials ... |
|
| Stress Corrosion Environmental Effects on AF 1410. |
1978 |
|
| Authors:
Victor V. Damiano; FRANKLIN INST RESEARCH LABS PHILADELPHIA PA
|
| AF 1410 plates available from Universal Cyclops through Air Force Materials Laboratory were welded using filler wire fabricated from sheet stock of the same composition as the base plate. The method of welding was cold wire-gas tungsten arc using manual feed. Satisfactory welds having mechanical properties as welded approaching the properties of the base plate in the double austenitized and aged condition were obtained. |
|
| Reliability of Welded Joints and Structures (Selected Articles). |
26 JUL 1977 |
|
| Authors:
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
|
| Contents: Estimation of the Reliability of Welded Joints; Effect of Technological Defects on Service Life and Reliability of Welded Joints; Reliability of Welded Constructions in Work in Corrosive Environments; Elimination of Residual Deformations During the Welding of Sheet Panel Constructions; Elimination of the Deformations of Loss of Stability During Plate Welding with Frames; Improvement in the Weldability of the Material SAP. |
|
| Lockalloy Be-38Al Material Characterization, 1976 Year-End Report, |
10 MAY 1977 |
|
| Authors:
J. F. Sullivan; A. C. Haramis; LOCKHEED-CALIFORNIA CO BURBANK
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| Lockalloy, Be-38Al, is a beryllium-aluminum composite material originally developed by LMSC. The potential use of Lockalloy as a structural material is emphasized for applications on Hypersonic Flight Vehicles or other installations requiring high stiffness to weight ratios, high heat conductivity and/or high specific heat. This year-end report documents the results to date of a testing program to further establish the characteristics of Lockalloy material. The testing was performed by Advanced ... |
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| ONR Tokyo Scientific Bulletin. Volume 2, Number 3. July-September 1977, |
1977 |
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| Authors:
Morton A. Bertin; OFFICE OF NAVAL RESEARCH SCIENTIFIC LIAISON GROUP APO SAN FRANCISCO 96503
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| This publication presents articles covering recent developments in Far Eastern (particularly Japanese) scientific research. The articles are written primarily by members of the staff of ONR Tokyo, with certain reports also being contributed by visiting stateside scientists. |
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| Development Program for Improving Foundry and Repair Welding Techniques for ZE41-type Magnesium Alloy Castings. |
SEP 1976 |
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| Authors:
Jaydev Desai; HITCHCOCK INDUSTRIES INC MINNEAPOLIS MINN
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| This report describes a development program for improved foundry and repair welding techniques for large complex ZE41-type magnesium castings, such as currently specified by the designers of next generation of army aircraft (e.g. the AAH, UTTAS, etc.). This one year program was directed at resolving the weld cracking problem in ZE41 magnesium alloy combiner housing casting for the HLH aircraft, and making it a high quality reproducible part. The results ... |
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Reports by Keyword(s)
WELDABILITY
