Title: Varied heating rate solution heat treatment for superalloy castings
Application Number: 87102762 Application Date: 1987.04.09
Publication Number: 1014071 Publication Date: 1987.10.21
Approval Pub. Date: 1992.07.01 Granted Pub. Date: 1992.07.01
International Classifi-cation: C22F1/10
Applicant(s) Name: United Technologies Corp. Address:
Inventor(s) Name: Earle Arthur Ault
Attorney & Agent: YANG LIQIN WU HONGLIANG
Abstract:
    Methods for heat treating cast, nickel base superalloy articles are described. According to the invention, the articles are heated to progressively higher temperatures greater than the gamma prime solvus temperature and less than the incipient melting temperature. The incipient melting temperature is increased due to homogenization of segregate phases, while at the same time, the gamma prime goes into solution. The rate at which the temperature is increased closely approximates the rate at which the incipient melting temperature increases due to homogenization.
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