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Date of Publication:2015-01-01

Journal:材料工程

Affiliation of Author(s):材料科学与工程学院

Issue:4

Page Number:19-24

ISSN No.:1001-4381

Abstract:Inconel 740 alloy was prepared by electron beam melting (EBM). The microstructure evolution and microhardness variation of the alloy under heat treatment conditions were investigated, the precipitation principle and distribution characteristics of phases during heat treatment process were analyzed. The results indicate that Inconel 740 alloy has a good macrostructure and lower inclusion content, the grain size is about 2mm. The microstructure is austenite with a lot of twin crystals after standard heat treatment, the M23C6 carbides are distributed continuously on the grain boundaries, with G phase and η phase. Lots of spherical and 30nm in size strengthen phase γ' precipitate in the grain. The microhardness of Inconel 740 alloy prepared by electron beam melting with standard heat treatment is about 120 HV0.1 higher than the same alloy that made through traditional method. ©, 2015, Beijing Institute of Aeronautical Materials (BIAM). All right reserved.

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