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Effects of Hydrogen on Fatigue Crack Growth of Iron Aluminides

Published online by Cambridge University Press:  22 February 2011

A. Castagna  and
N.S Stoloff
A. Castagna
Affiliation:
Rensselaer Polytechnic Institute, Materials Engineering Department, Troy, NY 12180–3590
N.S Stoloff
Affiliation:
Rensselaer Polytechnic Institute, Materials Engineering Department, Troy, NY 12180–3590
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Abstract

Three Fe-Al alloys, FAP-Y, FA-129, and Fe-35a%Al, containing 16, 28, and 35a%Al, respectively, have been subjected to fatigue crack growth testing in moist air, in oxygen, and in gaseous hydrogen. In each case hydrogen and air were embrittling. Crack growth rates increased significantly as frequency decreased. Fatigue crack growth results have been compared with those for other structural iron-base alloys. Surprisingly, FAP-Y displays the highest crack growth rate of any alloy examined, except at very low levels of stress intensity range. The mechanisms for embrittlement by hydrogen and by moisture in air are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1171
Copyright
Copyright © Materials Research Society 1995

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