公开(公告)号：CA1094928A

公开(公告)日：1981-02-03

申请号：CA275987

申请日：1977-04-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： HENRICKS ROBERT J ,  RUCKLE DUANE L ,  SLACK RAYMOND B

IPC: C22F1/18

Abstract: METHOD FOR IMPROVING FATIGUE PROPERTIES OF TITANIUM ALLOY ARTICLES A thermomechanical treatment to improve the fatigue strength of articles made from one of a class of alpha beta titanium alloys. The treatment involves heating the alloy into the beta field, hot deforming the alloy at a temperature within the beta field, rapidly quenching the alloy to room temperature to produce a hexagonal martensite structure and then tempering at an intermediate temperature so as to produce a structure in which discrete equiaxed beta phase particles are present in an acicular alpha matrix. This structure is particularly resistant to the initiation and propagation of fatigue cracks. EH-4422