Accession Number:

ADA007427

Title:

Fractography Observations of Fatigue Failures in Titanium Alloys.

Descriptive Note:

Research memo.,

Corporate Author:

GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT

Personal Author(s):

Report Date:

1975-02-01

Pagination or Media Count:

18.0

Abstract:

Fractographic examinations were made on two titanium alloys Ti 6Al 4V and Ti 6Al 2Sn 6V the alloys were subjected to different thermomechanical histories and failed in a constant amplitude fatigue test. Results showed no specific correlation between chemistry of alloy and failure mode however, a clear-cut microstructural dependence of local crack advance was noted. Alpha grain boundaries and alpha-beta interfaces were delineated by the presence of secondary cracks showing their relative weakness. The fracture appearance of these alloys is explained in terms of the localized cyclically work-hardened zone just ahead of the advancing fatigue crack.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE