Accession Number : AD0709164

Title :   EVALUATION OF HYDROGEN EMBRITTLEMENT MECHANISMS.

Descriptive Note : Technical rept.,

Corporate Author : TRW EQUIPMENT LABS CLEVELAND OHIO MATERIALS TECHNOLOGY DEPT

Personal Author(s) : Barth,C. F. ; Steigerwald,E. A.

Report Date : 01 JUL 1970

Pagination or Media Count : 25

Abstract : The incubation time which precedes the initiation of slow crack growth in the delayed failure of high-strength steel containing hydrogen was reversible with respect to the applied stress. The kinetics of the reversibility process indicated that it was controlled by the diffusion of hydrogen and had an activation energy of approximately 9000 cal/mole. Reversible hydrogen embrittlement studies were also conducted at liquid nitrogen temperatures where diffusional processes should not occur. The previously reported low temperature embrittlement behavior was confirmed indicating a basic interaction between hydrogen and the lattice. The experimental results could be satisfactorily explained by the lattice embrittlement theory proposed by Troiano. (Author)

Descriptors :   (*HYDROGEN EMBRITTLEMENT, THEORY), (*STEEL, HYDROGEN EMBRITTLEMENT), CRACK PROPAGATION, STRESSES, DIFFUSION

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE