期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 10, 期 3, 页码 299-312出版社
ASM INTERNATIONAL
DOI: 10.1361/105994901770345015
关键词
gas turbine blades; HIP; IN738 alloy; nickel-based superalloys
Rejuvenation of Ni-based superalloy gas turbine blades is widely and successfully employed in order to restore the material microstructure and properties after service at high temperature and stresses. Application of hot isostatic pressing (HIP) and re-heat treatment can restore even a severely overaged blade microstructure to practically as-new condition. However, certain service-induced microstructural changes might affect an alloy's behavior after the rejuvenated blades are returned to service. It was found that advanced service-induced decomposition of primary MC carbides, and the consequent changes of the gamma -matrix chemical composition during the rejuvenation, can cause a considerable acceleration of the aging process in the next service cycle, The paper will discuss the influence of the previous microstructural deterioration on the aging kinetics of rejuvenated gas turbine blades made from IN-738 and conventionally cast GTD-111 alloys.
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