Research on Chromium-base Alloys Exhibiting High-temperature Strength, Low-temperature Ductility, and Oxidation Resistance PDF Download
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Author: Carl S. Wukusick
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 88
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Book Description
Improvements in ductility, strength, and oxida tion resistance of chromium were obtained by combinations of small amounts of rhenium and reactial additions (yttrium, thorium, and hafnium). Dispersions, formed by reactions be tween 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 oxida tion resistance than single additions. Possible mechanisms are outlined. Two alloys exhibited resistance to nitrification for 100 hours at 2500 F in thick sections. These were a Cr - 10 wt-% Re Y, Th, and Hf alloy and a Cr - 15 volume percent Y2O3 - 1 wt-% Y cermet. Thin sections exhibited less resistance to nitrification.
Author: Carl S. Wukusick
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 88
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Book Description
Improvements in ductility, strength, and oxida tion resistance of chromium were obtained by combinations of small amounts of rhenium and reactial additions (yttrium, thorium, and hafnium). Dispersions, formed by reactions be tween 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 oxida tion resistance than single additions. Possible mechanisms are outlined. Two alloys exhibited resistance to nitrification for 100 hours at 2500 F in thick sections. These were a Cr - 10 wt-% Re Y, Th, and Hf alloy and a Cr - 15 volume percent Y2O3 - 1 wt-% Y cermet. Thin sections exhibited less resistance to nitrification.
Author: William D. Klopp
Publisher:
ISBN:
Category : Chromium alloys
Languages : en
Pages : 36
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Category :
Languages : en
Pages : 564
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Author: Joseph R. Stephens
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Category : Chromium alloys
Languages : en
Pages : 44
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Author: D. J. Maykuth
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ISBN:
Category : Chromium
Languages : en
Pages : 130
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Various alloying additions have been discovered which render unalloyed chromium much less susceptible to low-temperature embrittlement as well as to nitridation in air at elevated temperatures. These include additions of the Group IIIA metals, magnesia, and carbides based on the Groups IVA and VA metals. Of these additions, only the carbides contribute significantly to the hot strengthening of chromium. The combination of selected carbides and solid-solution-strengthening elements such as tungsten, molybdenum, and/or tantalum, has resulted in experimental alloys which retain useful strengths at temperatures through 1316 C (2400 F). These high strengths are achieved at some sacrifice in the low-temperature ductility of chromium. Also, despite the improvements afforded in the oxidation and nitridation resistance of chromium through alloying, no alloys are available which are capable of service in long-time exposures in air above 982 C (1800 F) without suffering some property degradation.
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Category : Aeronautics
Languages : en
Pages : 688
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Category : Science
Languages : en
Pages : 216
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Category : Power resources
Languages : en
Pages : 490
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Category : Nuclear energy
Languages : en
Pages : 1002
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Author:
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Category : Aeronautics
Languages : en
Pages : 840
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