Solidification segregation characteristic and homogenization treatment of GH141 superalloy

doi:10.13251/j.issn.0254-6051.2022.05.023

Abstract

Abstract: Segregation characteristics and microstructure of the as-cast GH141 superalloy ingot prepared by vacuum induction melting (VIM) and vacuum arc remelting (VAR) were investigated by means of optical microscope (OM), scanning electron microscope and energy dispersive spectroscopy (EDS). Meanwhile, the effect of homogenization temperature and time on evolution of microstructure, precipitates and segregation of the GH141 superalloy was also studied. The results show that the as-cast GH141 alloy exhibits dendritic segregation, in which Ti and Mo are segregated to the interdendritic regions, while Al, Co and Cr are segregated to the dendrites. The main precipitates are MC, M₆C and M₂₃C₆ carbides in interdendritic regions. With the increase of homogenizing temperature and holding time, dendrite structure is eliminated, carbides are redissolved and segregation elements are gradually distributed evenly by diffusion. It is found that the element segregation is basically eliminated and most of the carbides are redissolved in the GH141 alloy after homogenization at 1190 ℃ for 48 h.

Key words: GH141 alloy, segregation, homogenization, microstructure, carbides

CLC Number:

Xiao Dongping, Zhou Yang, Fu Jianhui, Yang Haodi. Solidification segregation characteristic and homogenization treatment of GH141 superalloy[J]. Heat Treatment of Metals, 2022, 47(5): 141-147.

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