Accession Number : AD0462843


Title :   STRUCTURAL CHANGES IN HIGH-STRENGTH STEEL ASSOCIATED WITH STRESS CORROSION AND ITS RELATIONSHIP TO DELAYED FAILURE.


Descriptive Note : Quarterly progress rept. no. 2, 28 Sep-28 Dec 64,


Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH


Personal Author(s) : Phalen, D I ; Vaughan, D A ; Tripler, A B ; Boyd, W K ; Schwartz, C M


Report Date : 27 Jan 1965


Pagination or Media Count : 18


Abstract : 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)


Descriptors :   *STEEL , CORROSION , FRACTOGRAPHY , HYDROGEN EMBRITTLEMENT , X RAY DIFFRACTION , SURFACE PROPERTIES , AUSTENITE , MARTENSITE , CRYSTAL DEFECTS , HYDROGEN , DUCTILITY


Distribution Statement : APPROVED FOR PUBLIC RELEASE