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Title: RESEARCH ON CHROMIUM-BASE ALLOYS EXHIBITING HIGH-TEMPERATURE STRENGTH, LOW- TEMPERATURE DUCTILITY, AND OXIDATION RESISTANCE

Abstract

Improvements in ductility, strength, and oxidation resistance of chromium were obtained by combinations of small amounts of rhenium and reactive metal additions (yttrium, thorium, and hafnium). Dispersions, formed by reactions between impurities and reactive metal additions or by the addition of dispersoid-forming elements, resulted in increased ductility and strength. Combinations of reactive metal additions were more effective in improving ductility and oxidation resistance than single additions. Possible mechanisms are outlined. Two alloys exhibited resistance to nitrification for 100 hours at 3500 deg F in thick sections. These were a Cr-- 10 wt% Re + Y, Th, and Hf alloy and a Cr--15 vol% Y/sub 2/O/sub 3/ --1 wt% Y cermet. Thin sections exhibited less resistance to nitrification. Attempts to form a more protective Al/sub 2/O/ sub 3/ surface layer through additions of Al (up to 5 wt%) to Cr--Re and Cr-W alloys were not successful, and detrimental internal oxidation occurred in all alloys. Experiments aimed at substitution for all or a part of the rhenium in the ductile Cr--35 at.% Re alloy were not successful. Combinations of low rhenium contents and dispersions resulted in an improved combination of strength, oxidation resistance, and ductility. (auth)

Authors:
Publication Date:
Research Org.:
General Electric Co. Advanced Technology Services, Cincinnati
OSTI Identifier:
4639712
Report Number(s):
ASD-TDR-63-493; AD-411116
NSA Number:
NSA-17-036288
DOE Contract Number:  
AF33(657)-8471
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-63
Country of Publication:
United States
Language:
English
Subject:
METALS, CERAMICS, AND OTHER MATERIALS; ALUMINUM OXIDES; CERMETS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CORROSION PROTECTION; DUCTILITY; HAFNIUM ALLOYS; HIGH TEMPERATURE; LAYERS; NITRIDES; OXIDATION; RHENIUM ALLOYS; STABILITY; TEMPERATURE; TENSILE PROPERTIES; THICKNESS; THORIUM ALLOYS; TRACE AMOUNTS; TUNGSTEN ALLOYS; YTTRIUM ALLOYS; YTTRIUM OXIDES

Citation Formats

Wukusick, C S. RESEARCH ON CHROMIUM-BASE ALLOYS EXHIBITING HIGH-TEMPERATURE STRENGTH, LOW- TEMPERATURE DUCTILITY, AND OXIDATION RESISTANCE. United States: N. p., 1963. Web.
Wukusick, C S. RESEARCH ON CHROMIUM-BASE ALLOYS EXHIBITING HIGH-TEMPERATURE STRENGTH, LOW- TEMPERATURE DUCTILITY, AND OXIDATION RESISTANCE. United States.
Wukusick, C S. 1963. "RESEARCH ON CHROMIUM-BASE ALLOYS EXHIBITING HIGH-TEMPERATURE STRENGTH, LOW- TEMPERATURE DUCTILITY, AND OXIDATION RESISTANCE". United States.
@article{osti_4639712,
title = {RESEARCH ON CHROMIUM-BASE ALLOYS EXHIBITING HIGH-TEMPERATURE STRENGTH, LOW- TEMPERATURE DUCTILITY, AND OXIDATION RESISTANCE},
author = {Wukusick, C S},
abstractNote = {Improvements in ductility, strength, and oxidation resistance of chromium were obtained by combinations of small amounts of rhenium and reactive metal additions (yttrium, thorium, and hafnium). Dispersions, formed by reactions between impurities and reactive metal additions or by the addition of dispersoid-forming elements, resulted in increased ductility and strength. Combinations of reactive metal additions were more effective in improving ductility and oxidation resistance than single additions. Possible mechanisms are outlined. Two alloys exhibited resistance to nitrification for 100 hours at 3500 deg F in thick sections. These were a Cr-- 10 wt% Re + Y, Th, and Hf alloy and a Cr--15 vol% Y/sub 2/O/sub 3/ --1 wt% Y cermet. Thin sections exhibited less resistance to nitrification. Attempts to form a more protective Al/sub 2/O/ sub 3/ surface layer through additions of Al (up to 5 wt%) to Cr--Re and Cr-W alloys were not successful, and detrimental internal oxidation occurred in all alloys. Experiments aimed at substitution for all or a part of the rhenium in the ductile Cr--35 at.% Re alloy were not successful. Combinations of low rhenium contents and dispersions resulted in an improved combination of strength, oxidation resistance, and ductility. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/4639712}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1963},
month = {Sat Jun 01 00:00:00 EDT 1963}
}

Technical Report:
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