| Characterization of Materials Degradation due to Corrosion and Fatigue in Aerospace Structures |
13 MAY 1999 |
17 pages |
| Authors:
A. K. Mai; J. M. Yang; K. Ono; CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIEDSCIENCE
|
 | Research was carried out in two related areas: (1) the degradation inthe load carrying capacity of the structural components, and (2) nondestructive evaluation (NDE) for characterization of the degradation. In the first topic, the effect of pitting corrosion on the strength of aircraft grade aluminum alloys was studied through laboratory tensile and fatigue tests and theoretical modeling. The probability of failure in the presence of multiple pits was found to ... |
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| Extra-Low Oxygen Niobium and Titanium to Produce Ultra-Clean Superconductive Nb-Ti Alloy |
1994 |
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| Authors:
K. Ono; Yong H. Kim; T. F. Kumon; T. H. Okabe; R. O. Suzuki; KYOTO UNIV (JAPAN) DEPT OF METALLURGY
|
 | This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: nb-ti materials related terms: calcium oxide addition, deoxidation, residual resistivity, titanium addition, vickers hardness processing: electron beam melting miscellaneous and special technical terms: niobium alloys. |
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| Preparation of Extra Low Oxygen Titanium by the Calcium-Halide Flux Deoxidation Process |
90 |
|
| Authors:
T. H. Okabe; R. O. Suzuki; T. Oishi; K. Ono; KYOTO UNIV (JAPAN) DEPT OF METALLURGY*
|
| Fine titanium powders were produced directly from TiO2 by calciothermic reduction; the advanced methods were examined to obtain extra low oxygen titanium (bellow 100 mass ppm) by calcium halide flux deoxidation; the fine titanium powders obtained about 2000 ppm oxygen and 1000 ppm when reduced by using calcium metal granules and CaH2 powders; titanium wires and small pieces containing several hundreds ppm oxygen were deoxidized down to the level of ... |
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| Oxide Ceramic Fibers by the Sol-Gel Methods |
10 FEB 89 |
79 pages |
| Authors:
J. D. Mackenzie; K. Ono; CALIFORNIA UNIV LOS ANGELES
|
| Sol-gel processing has many advantages over traditional powder based ceramic processing. These advantages include better homogeniety, higher purity and low temperature synthesis. Additionally, the sol-gel process is the only low temperature process available to make high temperature stable oxide fibers. Most of these fibers cannot be formed by drawing via the traditional melt method. This report includes research conducted on the preparation of lanthanum chromite fibers. Lanthanum chromite's high temperature ... |
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| FRACTURE MECHANISM STUDIES OF CARBON FIBER REINFORCED THERMOPLASTIC COMPOSITES BY ACOUSTIC EMISSION |
NOV 88 |
|
| Authors:
J. S. Jeng; K. Ono; J. M. Yang
|
| in this paper, failure mechanisms of thermoplastic matrix composites, i.e., two types of carbon fiber reinforced thermoplastic laminates, c/peek (polyetheretherketone) and c/pps (polyphenylene sulfide), were studied. three- point bending, enf (end-notched flexure), and tensile tests were used. during each test, load and acoustic emission (ae) parameters were recorded. several ae parameters of processed ae events were analyzed to distinguish different fracture modes, such as fiber breakage, delamination, matrix cracking, and ... |
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| AE SOURCE LOCATION AND ORIENTATION DETERMINATION OF TENSILE CRACKS FROM SURFACE OBSERVATION |
JUN 88 |
|
| Authors:
M. Ohtsu; K. Ono
|
| a technique to determine the location and orientation of an acoustic emission (ae) source due to a tensile crack was studied. theoretical ae waveforms from tensile cracks were synthesized on the basis of the generalized theory of ae. numerical experiments were conducted using the waveforms. we considered a source location technique using only surface observations and took into account the effects of velocity anisotropy. the technique is based on the ... |
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| Axial Compression Buckling Test on Structural Element Models for H-2 Rocket Satellite Fairing (Aluminum Surface Plate/Aluminum Honeycomb Sandwich Curved Plates) |
JAN 87 |
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| Authors:
S. Endo; Y. Noguchi; K. Otake; K. Ono; Y. Fukushima; NATIONAL AEROSPACE LAB TOKYO (JAPAN)
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| In order to grasp the complicated buckling behavior peculiar to the honeycomb sandwich structures for satellite fairing, and to obtain the basic materials which are useful for the structural design of fairings, the axial compression buckling test on aluminum honeycomb sandwich curved plates was carried out. The number of specimens was three, and their material composition was the same, but the forms and dimensions were slightly changed. In the test, ... |
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| THE DETECTION OF LONGITUDINAL RAIL FORCE VIA MAGNETOMECHANICAL ACOUSTIC EMISSION |
DEC 85 |
|
| Authors:
M. Shibata; E. Kobayashi; K. Ono
|
| magnetomechanical acoustic emission (mae) is generated in ferromagnetic materials, by the motion of magnetic domains. the intensity of mae is stress-dependent so that nondestructive methods for residual stress determination may be developed. in this report, the authors present the results of mae experiments intended to form the basis for longitudinal rail force detection in railroad rails. mae responses were evaluated of several rail sections 0.3 to 1 m long, area ... |
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| Contributions to the International Acoustic Emission Conference (2nd) |
SEP 85 |
|
| Authors:
C. Johnson; M. Ohtsu; O. Y. Kwon; D. Chellman; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| This report is a compilation of four extended abstracts to be presented at the 2nd International Conference on Acoustic Emission at Lake Tahoe, on 28 October to 1 November 1985. The abstracts included information on the following topics: Discrimination of Fracture Mechanisms via Pattern Recognition Analysis of Acoustic Emission (AE) Signals during Fracture Testing; Acoustic Emission Behavior of Metal Matrix Composites; Burst-type Emission Behavior of Structural Steels; and Acoustic Emission ... |
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| Annual Summary Report for ONR Contract Number N00014-81-K-0011, Investigation from November 1984 to the Present |
SEP 85 |
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| Authors:
K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| This investigation is aimed at studying acoustic emission for applications to residual stress measurements and for the evaluation of structural integrity of engineering structures. Effects of microstructure, composition and prior cold working on magnetomechanical acoustic emission (MAE) have been studied. Magnetization behavior, magnetostriction and Barkhausen noise are affected by stress as well as other parameters. These responses will be measured simultaneously in order to identify the the stress level uniquely. ... |
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| ACOUSTIC EMISSION BEHAVIOR OF AN ADVANCED ALUMINUM ALLOY |
SEP 85 |
|
| Authors:
I. Roman; K. Ono; C. H. Johnson
|
| the present study was carried out in order to understand acoustic emission characteristics of new aluminum alloys for aircraft applications. these alloys contain lithium and have high stiffness and strength at lower density. tensile samples along the extrusion direction were solution heat-treated and aged at 24 and 176 degree c with or without stretching immediately after solution treatment. in all cases, ae signal intensity reached a maximum before yielding and ... |
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| ACOUSTIC EMISSION BEHAVIOR OF METAL MATRIX COMPOSITES |
SEP 85 |
|
| Authors:
C. Johnson; K. Ono; D. Chellman
|
| this paper describes a study in which ae techniques are applied to metal matrix composites in order to characterize deformation and fracture mechanics. this is of benefit in determining mmc suitability in a particular application. (ntiac) |
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| High Frequency Quantitative Analysis of Magnetomechanical Acoustic Emission |
JUN 85 |
|
| Authors:
K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| This report summarizes the results of a research project for development of nondestructive evaluation methods for residual stresses. A method using computerized pattern recognition analysis can successfully estimate the level of residual stress as well as microstructural changes of ferrous materials and components. Keywords: Digital signal analysis. |
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| Acoustic Emission Behavior of Metal Matrix Composites |
85 |
|
| Authors:
C. Johnson; K. Ono; D. Chellman; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| In this study Acoustic Emission techniques are applied to MMC in order to characterize deformation and fracture mechanics. Such information benefits the user of metal matrix composites in determining their suitability in a particular application. (author) |
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| Thermodynamic Properties of Oxygen in the Alpha and Beta Titanium-Oxygen Alloys at 800-1200 C, |
1985 |
|
| Authors:
S. Miyazaki; T. Oishi; K. Ono; KYOTO UNIV (JAPAN) DEPT OF METALLURGY*
|
| The thermodynamic study of solution of oxygen in the alpha and beta titanium was carried out by equilibrating titanium with calcium and magnesium mixed with its respective oxide in a container of steel at temperatures between 1150 and 1600 K. The standard free energy of solution of oxygen in titanium and the oxygen pressure-temperature-composition relationship in the alpha and beta titanium were evaluated using the experimental data. |
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| Contributions to the International Acoustic Emission Symposium (7th) |
SEP 1984 |
|
| Authors:
H. B. Teoh; I. Roman; M. M. Kwan; M. Shibata; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Contents: Magnetomechanical Acoustic Emission - Temperature Effects; Acoustic Emission Characterization of Failure, Mechanisms in Woven Roving Glass- Epoxy Composites; and Fracture Induced Acoustic Emission of A533B Steel - Effects of Test Temperature and Fracture Mechanisms. |
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| Acoustic Emission Waveforms in a Half Space |
SEP 1984 |
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| Authors:
M. Ohtsu; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| A generalized theory of acoustic emission (AE) is developed on the basis of the theory of elastodynamics and dislocation models. Acoustic emission sources are represented as dislocation sources and include both discontinuities of displacement components and tractions. As AE waves are observed at a stress free surface, Green's functions in a half space are obtained. Fortran programs for computing these functions for non-Cauchy solids are used to calculate AE waveforms ... |
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| Analysis of Piezoelectric Disks and Cylinders Using Finite Element Method |
SEP 1984 |
|
| Authors:
M. Ohtsu; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Resonance characteristics of piezoelectric transducer elements were analyzed using the finite element method (FEM). We developed a computer program based on the axisymmetrical element formulation. Using this program, we determined resonance frequencies and vibration modes of cylindrical and disk- shaped elements of BaTiO3, PZT-4 and PZT-5A ceramics. The resonance frequencies were obtained by the FEM analyses for the stress-free boundary condition. Resonance vibration modes were also determined and found to ... |
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| Resonance Analysis of Piezoelectric Transducer Elements |
1984 |
|
| Authors:
M. Ohtsu; K. Ono; CALIFORNIA UNIV LOS ANGELES
|
|
| A Generalized Theory of Acoustic Emission and Green's Functions in a Half Space |
1984 |
|
| Authors:
M. Y. Ohtsu; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
|
| Magnetomechanical Acoustic Emission of Ferromagnetic Materials at Low Magnetization Levels (Type I Behavior) |
84 |
|
| Authors:
M. M. Kwan; K. Ono; M. Shibata; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Magnetomechanical Acoustic Emission (MAE) intensities and waveforms were measured as a function of applied magnetic field for Fe, Ni and a number of Fe-Ni and Fe-Si alloys. MAE behavior has been correlated with various magnetic properties, including magnetic induction, magnetostriction, and rate of magnetic flux change. A direct proportionality was found between the initial saturation level of MAE intensity and magnetostriction. This is consistent with the prediction of a displacement ... |
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| Pattern Recognition Analysis of Magnetomechanical Acoustic Emission Signals |
84 |
|
| Authors:
M. Ohtsu; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| In order to quantify detected signals of magnetomechanical acoustic emission (MAE) for nondestructive testing applications, we employed pattern recognition analysis. MAE waveforms were determined for variously heat-treated A533B steel specimens subjected to several levels of magnetic field and tensile stress. The autoregressive coefficients and envelopes of the MAE waveforms were extracted and utilized for pattern classification on the basis of the weighted nearest neighbor decision rule. The autoregressive coefficients improved ... |
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| A New Method of Acoustic Emission Transducer Calibration |
84 |
|
| Authors:
M. Ohtsu; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| A new method of acoustic emission transducer calibration is developed using numerical solutions of Green's functions in a half space. This method allows transducer calibration without employing elaborate equipment. The calibration curves obtained for six transducers by the present method agree with results obtained by the Nippon Steel Corporation and the National Bureau of Standards. Originator-supplied key words: Waveforms, Lamb's problem reprints. (Author) ANNOTATION: Reprint: A New Method of Acoustic ... |
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| Acoustic Emission Behavior of Nickel during Tensile Deformation |
SEP 1982 |
|
| Authors:
S.-y. S. Hsu; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Commercial 99.6% purity nickel (Ni-200) was studied in detail for its AE behavior. The specimens slowly cooled from high-annealing temperature exhibited much higher AE signal levels than the quenched samples. This was attributed to the existence of solute pinning atmospheres around dislocations. The kinetic study using AE technique quantitatively determined the activation energy of solute diffusion, which was found to be close to the activation energy for the carbon diffusion ... |
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| ACOUSTIC EMISSION BEHAVIOR OF NICKEL DURING TENSILE DEFORMATION |
JUL 82 |
|
| Authors:
S. Y. S. Hsu; K. Ono
|
| commercial 99.6% purity nickel (ni-200) was studied in detail for its ae behavior. the specimens slowly cooled from high annealing temperature exhibited much higher ae signal levels than quenched samples. this is attributed to the existence of solute pinning atmospheres around dislocations. the kinetic study using ae technique quantitatively determined the activtion energy of solute diffusion in nickel. an ae source model, based on the dislocation acceleration and/or deceleration following ... |
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| Model for Fracture Toughness Alteration Due to Cyclic Loading |
MAY 82 |
|
| Authors:
I. Roman; K. Ono
|
| A new model that is capable of predicting and explaining the effect of cyclic loading on the apparent fracture toughness of materials was developed. The model combines macroscopic fracture criteria with the assumption that transient flow properties of material in the cyclic plastic zone can be simulated by those of macroscopic low cycle fatigue specimens, tested in reversed strain control. Little or no changes in the cleavage fracture toughness due ... |
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| MAGNETOMECHANICAL ACOUSTIC EMISSION - A NEW METHOD FOR NON-DESTRUCTIVE STRESS MEASUREMENT |
OCT 81 |
|
| Authors:
M. Shibata; K. Ono
|
| this paper describes a newly found nondestructive testing technique for residual stress measurements, which is called magnetomechanical acoustic emission (mae). it applies to ferromagnetic materials only, but has a greater depth of penetration than other common methods of residual stress analysis, such as x-ray diffraction and acoustic surface wave. previous studies on mae are reviewed, in which effects of metallurgical and magnetic parameters on mae were evaluated. our recent study ... |
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| ANISOTROPIC MECHANICAL AND ACOUSTIC EMISSION BEHAVIOR OF A533B STEELS |
MAR 81 |
|
| Authors:
K. Ono; M. Yamamoto
|
| acoustic emission characteristics of astm a533b steels were determined during tensile and fracture testing. two different heats of thick plates were employed, and the orientation dependence of acoustic emission and mechanical behavior were studied in tensile tests and slow bend charpy fracture tests. the types of acoustic emission signals, acoustic emission event counts, signal levels and amplitude distribution analysis were investigated. three distinct types of acoustic emission signals were identified. ... |
|
| The Effect of Cyclic Loading on the Apparent Cleavage Fracture Toughness of 1Cr-Mo-V Rotor Steel |
81 |
|
| Authors:
I. Roman; K. Ono; A. S. Tetelman
|
| The rotor steel conformed to ASTM A470 Class 8 and was normalized and tempered to give a TYS of 90 ksi and a UTS of 114 ksi. The fatigue crack growth rate and K(sub C) fracture toughness for room temperature tests are shown for specimens of different thicknesses. |
|
| MAGNETOMECHANICAL ACOUSTIC EMISSION (MAE) |
81 |
|
| Authors:
M. Shibata; K. Ono; M. Kwan
|
| this paper discusses magnetomechanical acoustic emission (mae). previous results of mae are reviewed, and characteristics and applications are given. preliminary investigations for practical applications have shown that: (1) asymmetrical magnetization, which is required in most practical applications, provides a similar result to the one using symmetrical magnetization; (2) the depth of penetration is 2 to 3 mm, and is much greater than other methods of residual stress analysis; (3) the ... |
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| THE DIRECTIONAL PROPERTIES OF HSLA STEELS DURING ACOUSTIC EMISSION AND FRACTURE TESTING |
NOV 80 |
|
| Authors:
M. Yamamoto; C. Ouchi; K. Ono
|
| effects of nonmetallic inclusions on the ductility, fracture toughness and ae behavior are well-known. flattened mns inclusions form during hot rolling operation and cause these deleterious effects. our previous studies revealed clear anisotropic ae behavior during tensile testing originating from the particular morphological features of mns inclusions. in the present study, the effects of number, size and shape of manganese sulfide inclusions on the energy absorbed in charpy impact testing ... |
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| ACOUSTIC EMISSION OF PLASTIC FLOW - I. METALS |
NOV 80 |
|
| Authors:
S. Y. S. Hsu; K. Ono
|
| this paper reports the first part of comprehensive study on ae of plastic flow. while a number of theoretical and experimental studies have been conducted, the understanding of dislocation related ae has remained an elusive target. in our study, a theoretical model of continuous ae, previously proposed by ono, has been developed further, including the operation of dislocation sources, unpinning, the distribution of internal stress and the drag term of ... |
|
| ACOUSTIC EMISSION OF PLASTIC FLOW - II. ALLOYS |
NOV 80 |
|
| Authors:
S. Y. S. Hsu; K. Ono
|
| this paper reports the second part of a comprehensive study on acoustic emission (ae) of plastic flow. ae behavior of eight different metallic alloys has been determined with the test temperature and heat treatment as the major variables. the extent of solute segregation is the major factor determining the ae behavior in cu-10 ni, cu-30 ni, cu-10 zn and cu-15 zn alloys. solute concentration had minor effects when solute atoms ... |
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| TEMPERATURE DEPENDENCE OF ANISOTROPIC AE BEHAVIOR OF A533B STEEL |
NOV 80 |
|
| Authors:
K. Okajima; K. Ono
|
| in this study, acoustic emission measurements were performed during tensile tests of astm a533b steel in order to investigate the influence of test temperature and thermal stress at the interface between the matrix and the mns inclusions on the anisotropy of acoustic emission characteristics. several different ae parameters for example rums voltages, event counts, event count rates, and amplitude distributions were employed. test temperature was from -150 deg c to ... |
|
| Superleak-Tight Stainless Steel Hollow O-Ring Seals for Cryogenic Use |
JUL 80 |
|
| Authors:
M. Shinohara; T. Kugo; K. Ono
|
| AISI 304 hollow O-rings either coated with silver or Teflon to a thickness of 0.04 mm were thermally cycled between room temperature and liquid nitrogen temperature. The coated seals were leak tight to the sensitivity limitation of the detector, whereas the uncoated specimens were not leak tight even at room temperature. Comparisons are drawn with lead, indium and brass O- rings. |
|
| magnetomechanical acoustic emission of iron and steels |
JAN 80 |
|
| Authors:
K. Ono; M. Shibata
|
| the motion of magnetic domain walls in ferromagnetic materials produces acoustic emission (ae). this type of ae has been detected during magnetization of a nickel by lord and during elastic loading of iron by higgins and carpenter. recently, kusanagi et. al. also found the intensity of ae due to alternating magnetic fields to depend on applied stress. since this magnetomechanical acoustic emission of mae phenomenon has a potential of performing ... |
|
| Relation Between Brinell Hardness of Titanium and Impurities (O(sub 2), Fe, N and C) |
80 |
|
| Authors:
K. Shimasaki; K. Ono; T. Tsuruno; OSAKA TITANIUM CO LTD AMAGASAKI (JAPAN)*
|
| A manufacturer of titanium sponge, has conducted a set of experiments with the objectives of clarifying the relation between the impurities and the hardness and utilizing the relation for the manufacturing process control of titanium sponge and quality assurance of shipping lots. |
|
| Cooperative Examination of the Influence of Atmospheric Temperature on the Hardness of Titanium Mill Products |
80 |
|
| Authors:
M. Nagai; K. Kashida; K. Ono; Y. Moriguchi; K. Murase; NIPPON STAINLESS STEEL CO LTD JOETSU CITY*
|
| It was confirmed that in titanium mill products also the hardness varied significantly according to temperature variation around the normal room temperature. The variation rate for both H(sub B) and H(sub V) per temperature variation of 10 C was about 2.1. |
|
| Primary Melting of Titanium with Plasma Arc |
80 |
|
| Authors:
T. Fujiwara; K. Kato; K. Ono; H. Yamada; DAIDO STEEL CO LTD NAGOYA (JAPAN)*
|
| Primary melting of titanium with plasma arc was investigated using an experimentally designed and constructed Plasma Progressive Casting (PPC) furnace using a 110 mm dia. water cooled mold and a power source of maximum D.C. 150KW. The apparent densities and the soundness of the PPC ingots melted under various melting conditions; plasma power, feeding rate and type of melting materials, were examined. |
|
| Fundamental Study on the Production of the Nb-Mo Alloys by the Combination of Simultaneous Carbothermic Reduction of the Mixture of Constituent Metal Oxides in Vacuum and Electron Beam Melting |
OCT 79 |
|
| Authors:
Y. Ueda; K. Ono; J. Moriyama
|
| The carbothermic reduction-electron beam melting combination method has made possible to prepare the pure niobium metal. Similar to the carbothermic reduction of niobium in vacuum, simultaneous reduction of niobium alloys from the mixtures of constituent metal oxides is expected to be possible. The mixtures of Nb(sub 2)O(sub 5) and MoO(sub 2) were reduced with carbon in vacuum at about 2200 K, and the Nb-Mo alloys thus obtained were melted in ... |
|
| THE CHARACTERISTICS OF SIGMA PHASE PRECIPITATED IN HK40-ALLOY |
JUN 79 |
|
| Authors:
D. Yamasaki; I. Hirata; T. Morimoto; K. Ono
|
| concerning the sigma phase which has precipitated in hk 40 heat resistant cast steel, a study has been carried out with the object of clarifying its properties, precipitation mechanism and the effect on material strength. the sigma phase precipitating in hk 40 alloy has two types in its shape and chemical composition, i.e. the massive type and the needle type. the two types of sigma have different precipitation mechanism. the ... |
|
| Acoustic Emission Method for Stress and Strain Determination. |
APR 1979 |
|
| Authors:
M. Shibata; K. Ono; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS
|
| Acoustic Emission (AE) was detected during magnetization of a nickel and was also found to depend on applied stress. Varying AE outputs were observed on several ferromagnetic materials under alternating magnetic field. This magnetomechanical AE phenomenon has a potential of performing nondestructive measurements of residual stresses in structures, components and weldments, and we examined systematically effects of applied stress and magnetic field strength in ferritic steels. Several carbon steels, A533B ... |
|
| Fracture and Fatigue Properties of 1Cr-Mo-V Bainitic Turbine Rotor Steels |
MAR 79 |
|
| Authors:
I. Roman; C. A. Rau Jr.; A. S. Tetelman; K. Ono; CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE
|
| The deformation, fracture and fatigue properties of 1Cr-Mo-V turbine rotor steel have been evaluated for a wide range of loading conditions and metallurgical structures controlled by melting and heat treatment practice. The mechanical property differences and corresponding metallurgical differences between older, air-melted steels and newer heats that are vacuum degassed were determined. Current vacuum degassing practice improves the tensile ductility, fracture toughness, and fatigue initiation resistance compared to air-melted material ... |
|
| PLASMA-ARC REMELTING OF STEELS AND SUPERALLOYS |
JAN 79 |
|
| Authors:
T. Fujiwara; K. Kato; K. Ono; H. Yamada
|
| The feature of plasma-arc remelting and the quality of plasma-arc remelted steels and superalloys were investigated by using an originally designed PPC (Plasma Progressive Casting) furnace with water-cooled copper mould of a 110 mm diameter and a maximum 150 kW power source. It was possible to control the solidification structure of the PPC ingot. By selecting a relatively slow melting rate against a given plasma power, the metal pool became ... |
|
| STABILITY OF INCLUSIONS EXTRACTED FROM 18-8 STAINLESS STEEL AND THE EFFECT OF INCLUSIONS ON THE CORROSION RESISTANCE OF THE STEEL |
AUG 78 |
|
| Authors:
K. Ono; T. Kono
|
| Attempts have been made to clarify the chemical and electrochemical properties of inclusions in 18/8 stainless steel. To investigate the electrochemical property of inclusions, a method has been developed for measuring the polarization curve of a few mg weight of inclusions extracted from 18/8 stainless steel. The solubilities in water and 3% NaCl solutions and polarization curves in a 3% NaCl solution of the extracted alpha-MnS and MnSe containing a ... |
|
| an acoustic emission study of the fracture of zinc selenide |
JAN 76 |
|
| Authors:
A. G. Evans; h. nadler; K. Ono
|
| acoustic emission data obtained on coated and uncoated discs of zinc selenide during progression to fracture suggest that final fracture should easily be detected (without significant interference from external sources) by transducers tuned to receive signals at 500 to 700 khz. studies of precursor activity have implications for failure prediction using fracture mechanics, but have not yielded sufficiently definitive spectral results to suggest approaches for consistently detecting precursors by acoustic ... |
|
| acoustic emission characteristics of structural steels (3k3) |
76 |
|
| Authors:
K. Ono; g. huang; H. Hatano
|
| this paper describes acoustic emission behavior of c-mn steels, 4130 steel and sa533b steels during tensile and fracture toughness tests. non- metallic inclusions were found to be the primary source of burst-type emission. (author) |
|
| A Study of Dislocation: Hydrogen Interaction in Titanium Aluminum Alloys via Internal Friction Measurements. |
MAR 1972 |
|
| Authors:
P. P. Tung; A. W. Sommer; K. Ono; NORTH AMERICAN ROCKWELL CORP LOS ANGELES CALIF LOS ANGELES DIV
|
| Hydrogen-dislocation interactions in alpha titanium-aluminum alloys were studied via internal friction measurements in the temperature range 200K to 500K. Employing a series of titanium-aluminum binary alloys (0 %, 1 at. % and 3 at. %Al) these interactions were monitored in terms of observation of a damping peak which centers around 390 K at 10 MHz. The activation energy and attempt frequency of the damping peak in pure titanium were found ... |
|
| Relaxation Processes in Metastable Beta Titanium Alloys. |
SEP 1971 |
|
| Authors:
A. W. Sommer; S. Motokura; K. Ono; O. Buck; NORTH AMERICAN ROCKWELL CORP LOS ANGELES CALIF LOS ANGELES DIV
|
| Extensive observations have been made on an internal friction peak in a series of metastable beta Ti-Mo and -V alloys. The peak was observed at two frequencies (10 to the 4th c/s and 10 to the 7th c/s) in temperature ranges of 120K to 140K and 153K to 210+K respectively depending on alloy compositions as well as frequency. In both alloy systems, the peak strength passed through a maximum with ... |
|
| VANADIUM ALLOY DEVELOPMENT. |
AUG 1971 |
|
| Authors:
A. S. Tetelman; A. J. Ardell; K. Ono; CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE
|
|
Reports by Author
