Accession Number : ADA321190

Title :   Mechanisms for the Hydrogen Environment Embrittlement Resistance of High Strength Alloys.

Descriptive Note : Progress rept. 15 Sep 95-15 Sep 96,

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Gangloff, R. P. ; Scully, J. R. ; Kelly, R. G.

PDF Url : ADA321190

Report Date : JAN 1997

Pagination or Media Count : 253

Abstract : The objectives of this research are to: (1) identify conditions under which high strength beta titanium alloys and Fe-Ni-based superalloys resist environment assisted cracking (EAC) in marine environments; (2) characterize EAC initiation and propagation versus metallurgical, chemical, and mechanical variables that may destabilize the crack tip passive film to promote both dissolution and hydrogen uptake; (3) test the hydrogen embrittlement mechanism; and (4) model EAC by integrating crack chemistry, surface repassivation kinetics, hydrogen uptake to trap sites, and crack tip process zone damage. This report summarizes the results obtained for FY 96 and includes papers published or prepared during the period from September, 1995 to September 1996.

Descriptors :   *HIGH STRENGTH ALLOYS, *FRACTURE(MECHANICS), *HYDROGEN EMBRITTLEMENT, STRESS STRAIN RELATIONS, MICROSTRUCTURE, HYDRIDES, CRACKING(FRACTURING), TRAPPING(CHARGED PARTICLES), CRACK PROPAGATION, FATIGUE(MECHANICS), NICKEL ALLOYS, STRESS CORROSION, OCEAN ENVIRONMENTS, TITANIUM ALLOYS, SUPERALLOYS.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE