Effect of melting technologies on microstructure and mechanical properties of GH4145 superalloy
LIU Meng1, LI Ai-min1, ZHANG Huan-huan1, YAN Sen1, ZHAO Peng2, YANG Shu-feng2
1. Technology Center, Avic Shangda Superalloys Co., Ltd., Xingtai 054800, Hebei, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：The effects of different melting technologies and heat treatments on the microstructure, tensile properties and stress rupture notch sensitivity of GH4145 alloy were studied by means of metallographic examination, mechanical properties test and SEM analysis. The results show that after solution and aging treatment, the average grain size of GH4145 alloy bars produced by electroslag remelting is smaller than that produced by vacuum arc remeltig. With the increase of solution temperature, the grain size of the alloy increases, and the turning point temperature of the grain size is 1 100 ℃, which is higher than that of 1 050 ℃ produced by vacuum arc remelting. The average size of γ' strengthening phase of the investigated alloy produced by vacuum arc remelting is smaller than that produced by electroslag remelting, and the tensile strength, yield strength, elongation and reduction of area of the GH4145 alloy are significantly higher than that of the later one. With the increase of solution temperature, the stress rupture life of GH4145 alloy produced by vacuum arc remelting becomes worse and the notch sensitivity is obvious. However, at the same heat treatment, the stress rupture life of GH4145 alloy produced by electroslag remelting is significantly improved, and there is no notch sensitivity.
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2020, Vol. 30 
