METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

Potential Probe Measurements and Potential Profiles Across Weldments of Corrosion Resistant Nickel-Base Alloys and Special Stainless Steels

Authors: E. Altpeter; U. Heubner; M. Rockel; METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

The full text of this report is not available and therefore is not for sale. This information is provided for reference purposes only.

Potential profiles were measured across weldments (SMAW, GTAM, GMAW, Plasma) of the corrosion-resistant Ni-Cr-Mo alloys 22, C-276, C-4, of the Ni-Cr- Fe-Mo-Cu alloy G-3 as well as of the austenitic steel Cronifer 1925 hMo; after several tests had been made in a high-ohmic electrolyte solution of 90 vol.-% of methanol + 10 vol.-% of 0.001 M HCl the tests were continued in deionized water whose conductivity was adjusted by using ...

Novel ODS Super Alloys Manufacture and Properties

Authors: M. Ruhle; G. Korb; METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

Components of apparatus and engines, subjected to high temperature and reactive media, are normally manufactured out of Fe-Cr-Al or Ni-Cr-Al base alloys; chromium and aluminium predominantly are intended to form protective oxide layers; alloys of these two types do not exhibit sufficient high temperature strength for many applications; strengthening mechanisms have been developed, but most of them lose efficiency above about 1000 C; for increased strength beyond this limit dispersion ...

Creep Strength and Creep Ductility of Welded Heat Resistant Materials in a Carburizing Environment

Authors: U. Heubner; K. Drafahl; J. Henrich; METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

Creep tests were performed on welded and unwelded samples of alloys 800 H, 30, 333, X and 617 in a carburizing CH4/H2 (a(sub c) = 0.8) atmosphere at 750 C (1382 F), 850 C (1562 F) and 1000 C (1832 F); filler metals (FM) used for welding were alloys 65, 625, X and 617; the welding procedures applied included SMAW, GMAW and GTAW; times of testing were up to about ...

Evolution of Microstructure During Mechanical Alloying of Highly Heat Resisting Dispersion Strengthened Ni-Cr-Al-Alloys

Authors: M. Ruehle; Th. Steffens; K. Zoeltzer; METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

If mechanical alloying is carried out for a sufficiently long time under the proper conditions, the resulting powder will be reduced to submicron size and all will be of the same composition. In addition, the particle distribution will be entirely homogeneous. This is preferred for most oxide dispersion strengthened nickel-based superalloys.

The Influence of Iron Pick-Up on the Corrosion Properties of NiCu30Fe/ Steel Clad Materials

Authors: J. R. Bryant; M. B. Rockel; METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

Influence of iron pick-up on the corrosion properties of overlay and butt welds to NiCu30Fe/steel clad materials was investigated by electrochemical tests in aerated artificial seawater (ASTM D1141-75) at 25, 50 and 80 C and by exposure to seawater; NiCu30Fe plates with defined Fe contents between 0 and 14% were used for comparison; when the Fe was distributed homogeneously, no negative influence of the Fe on the pitting resistance was ...

230000 H Creep Properties of Titanium Produced from Electrolytic and Sponge Material and TiAl6V4 Alloy at 20 C,

1985

Authors: K. Drefahl; P. Wincierz; U. Zwicker; P. Delarbre; METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

Creep tests at 20 C have been performed with titanium of commercial purity for 27 years. Logarithmic creep is found up to about 1% creep strain. For higher creep strains up to about 15% the parabolic creep rule is valid. Grain size within the range of 20 up to 3000 microns has no significant influence upon creep resistance. A master curve for the rupture strength based upon the Larson-Miller-method is ...

Pitting, Crevice and Stress Corrosion Resistance of High Cr and Mo Alloy Stainless Steels

Authors: M. B. Rockel; METALLGESELLSCHAFT A G FRANKFURT AM MAIN (GERMANY F R)**

The paper presents new data on the resistance of high alloyed stainless steels of recent development against local corrosion in chloride solutions. The pitting behavior is evaluated by the determination of the pitting potential in artificial sea water. Additionally, the critical pitting temperature (CPT) is determined in the very aggressive ferric chloride solution. In order to check the crevice corrosion resistance the critical crevice corrosion temperature (CCT) is tested in ...