Accession Number : AD0785409

Title :   Effects of Microstructural Modification on Titanium Toughness and Fatigue,

Corporate Author : GRUMMAN AIRCRAFT ENGINEERING CORP BETHPAGE N Y RESEARCH DEPT

Personal Author(s) : Kennedy,James

Report Date : AUG 1974

Pagination or Media Count : 13

Abstract : Some effects of microstructure and chemical composition on the toughness and fatigue characteristics of titanium alloys after various heat treatments are described. The present studies were conducted on Ti-6Al-4V and Ti-6Al-6V-2Sn plate and forging in the mill annealed and recrystallized annealed conditions. It was generally observed that fracture toughness (K sub Ic) was improved by recrystallization annealing heat treatments and that lower alpha stabilizing contents (i.e., Al, O, N, C) and grain coarsening were associated with higher K sub Ic values. A similar trend for fatigue crack growth for these materials may have increased sensitivity to differences in microstructure and chemistry at low stress intensities during fatigue loading. (Modified author abstract)

Descriptors :   *Titanium alloys, *Fatigue(Mechanics), Microstructure, Heat treatment, Composition(Property), Aluminum alloys, Vanadium alloys, Tin alloys, Crack propagation, Impurities, Toughness

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE