Effect of homogenization treatment on microstructure and mechanical properties of GH5188 alloy

doi:10.13251/j.issn.0254-6051.2023.02.023

Abstract

Abstract: Law of solute element segregation and microstructure evolution during homogenization heat treatment process of GH5188 alloy ingots and the effect of homogenization process on mechanical properties of GH5188 alloy were analyzed by means of JMatPro software, metallurgical microscope, scanning electron microscopy, energy dispersive spectroscopy and high temperature tensile and compression tests. The results show that the main precipitation phases of the GH5188 alloy are M₆C and M₂₃C₆, the important positive segregation elements are W and Cr, and important negative segregation elements are Ni and Co. 1200 ℃×72 h homogenization treatment can reduce original precipitated phases in as-cast ingots, eliminate W, Cr, Ni, Co, et al element segregation and achieve the most suitable uniformity. After homogenization heat treatment process, the mechanical properties of the GH5188 alloy are improved. Under tensile and compression conditions at 1180 ℃, the tensile strength reaches 158 MPa, and the deformation resistance is 244.29 MPa.

Key words: GH5188 alloy, homogenization, segregation, as-cast microstructure, mechanical properties

CLC Number:

TG132.3

Qi Huilin, Jiang Shichuan, Guo Xulong. Effect of homogenization treatment on microstructure and mechanical properties of GH5188 alloy[J]. Heat Treatment of Metals, 2023, 48(2): 150-157.

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