Effect of solution treatment on microstructure of GH99 alloy

doi:10.13251/j.issn.0254-6051.2020.08.034

Abstract

Abstract: Grain size and grain boundary characteristic distribution of the GH99 alloy were analyzed by electron backscattered diffraction (EBSD) at different solution treatment temperatures and time. The results show that the grains of the GH99 alloy gradually become equiaxed after the solution treatment. There are a large number of twin boundaries in the grains, and the most of them are flatter Σ3 grain boundary. The grains grow gradually as the temperature and the time of solution treatment increase, while the grain growth rate is different at different temperatures and time, and the annealing twins grow with the growth of the grains. With the increase of solution treatment temperature and time, the fraction of the Σ3 grain boundary increases firstly and then decreases, while the fraction of Σ9 and Σ27 grain boundaries shows a gradual decreasing trend.

Key words: solution treatment, GH99 alloy, grain size, special boundaries, grain boundary distribution

CLC Number:

TG142

Qin Shengxue, Wang Yan, Zhang Hongbin, Zhou Haiping, Liu Jie. Effect of solution treatment on microstructure of GH99 alloy[J]. Heat Treatment of Metals, 2020, 45(8): 173-178.

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