C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/35.7
C22F 1/18 (2006.01)
Patent
CA 1094928
METHOD FOR IMPROVING FATIGUE PROPERTIES OF TITANIUM ALLOY ARTICLES ABSTRACT OF THE DISCLOSURE 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 - 1 -
275987
Henricks Robert J.
Ruckle Duane L.
Slack Raymond B.
Swabey Ogilvy Renault
United Technologies Corporation
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