Accession Number : AD0724606

Title :   The Fatigue Properties of Titanium and Titanium Alloys. Part. III. The Effect of Cold Working and Heat Treatment on the Fatigue Strength (Ueber das Dauerschwingverhalten von Titan und Seinen Legierungen. III. Einfluss von Kaltverformung und Waermebehandlung auf die Wechselfestigkeit),

Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s) : Hempel,M.

Report Date : FEB 1971

Pagination or Media Count : 43

Abstract : Increases in strength of sheets, bars and wires made from unalloyed titanium may be achieved by cold rolling or cold drawing. The percentage increase in strength depends on the initial strength of the titanium material and on the degree of cold working. With increases in the degree of working, in the case of unnotched test pieces, the tensile strength increases to a greater extent than the fatigue strength. The notch sensitivity also increases with an increase in the degree of working, while the notch effect factors are also increased with increasing stress concentration factors. Strengthening of unalloyed titanium by drawing or by twisting also leads to an increase in the tensile and fatigue strengths of unnotched test pieces. An improvement in the strength properties of binary, ternary or complex titanium alloys may be obtained by suitable heat treatment. The grain size produced by heat treatment, if it has any effect at all, only marginally influences the fatigue strength of titanium and titanium alloys. (Author)

Descriptors :   (*TITANIUM ALLOYS, FATIGUE(MECHANICS)), (*TITANIUM, FATIGUE(MECHANICS)), HEAT TREATMENT, COLD WORKING, MECHANICAL PROPERTIES, WEST GERMANY

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE