Accession Number : AD0877004

Title :   Study of Effects of Diffused Layers on the Fatigue Strengths of Commercial Titanium Alloys.

Descriptive Note : Final technical rept. 1 May 69-31 Mar 70,

Corporate Author : MARTIN MARIETTA AEROSPACE DENVER CO

Personal Author(s) : Kramer, Irvin R. ; Kumar, A.

Report Date : SEP 1970

Pagination or Media Count : 28

Abstract : Sheet specimens of titanium (6Al-4V) were tested in a constant deflection reverse bending machine, with and without surface alloying. It was observed that the endurance limit was increased from 56 ksi for the bare specimens to 67 ksi for the aluminum coated and diffused specimens. The specimens were tested in the annealed condition. Results obtained previously on the titanium (6Al-4V) was also increased from 77 ksi to 85 ksi by prestressing the surface removal. The testing was done under cyclic tension-compression for these specimens. Prestressing the titanium alloy in the plastic range did not improve the fatigue life. The optimum prestress level was found to be 100 ksi. (Author)

Descriptors :   (*TITANIUM ALLOYS, FATIGUE(MECHANICS)), SHEETS, COATINGS, STRESSES.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE