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:

1965-01-27

Pagination or Media Count:

18.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE