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STRUCTURAL CHANGES IN HIGH-STRENGTH STEEL ASSOCIATED WITH STRESS CORROSION AND ITS RELATIONSHIP TO DELAYED FAILURE.
Quarterly progress rept. no. 2, 28 Sep-28 Dec 64,
BATTELLE MEMORIAL INST COLUMBUS OH
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Microscopic and crystal-structure examinations have been made on AISI 4340 steel heat treated to four strength levels, to provide a basis for investigating changes in these materials during stress-corrosion cracking and hydrogen embrittlement. Preliminary studies on stress-corrosion fracture surface reveal two, and possibly three, morphological characteristics that coincide with specific areas in the fracture. Metal-hydrogen reactions that have been studied suggest different behavior for martensite and ferrite. The net result of the metal-hydrogen reaction was found to be an induced compressive stress in the surface. Author
APPROVED FOR PUBLIC RELEASE