Accession Number : AD0623567

Title :   ELECTRON MICROSCOPE FRACTURE EXAMINATION TO CHARACTERIZE AND IDENTIFY MODES OF FRACTURE.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Beachem,C. D.

Report Date : 28 SEP 1965

Pagination or Media Count : 124

Abstract : The fine-scale fracture topographies of both monotonic and fatigue fracture surfaces of several steels and aluminum and titanium alloys have been characterized. Some effects of orientation of specimen upon the fatigue crack surface appearance in 2024 T851 were found. Quasicleavage in hydrogen embrittled, 250,000 psi yield strength, maraging steel was discovered. Four overload fracture modes, including a previously unreported mode, were found in a 7075 T6 aluminum alloy by precision matching techniques. A number of failure analyses were made. (Author)

Descriptors :   (*FRACTOGRAPHY, ALLOYS), (*ALUMINUM ALLOYS, FRACTURE(MECHANICS)), (*STEEL, FRACTURE(MECHANICS)), (*TITANIUM ALLOYS, FRACTURE(MECHANICS)), ELECTRON MICROSCOPY, FATIGUE(MECHANICS), SURFACE PROPERTIES, FAILURE(MECHANICS), MICROSTRUCTURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE