Microstructure evolution mechanism of nickel-based superalloy GH4698 during hot deformation

doi:10.13251/j.issn.0254-6051.2021.06.043

Abstract

Abstract: Microstructure evolution mechanism of the GH4698 alloy under different deformation conditions was studied by means of thermal simulation. The results show that high temperature and low speed deformation is conducive to dynamic recrystallization, and the initial deformation temperature of fully dynamic recrystallization is higher than 1150 ℃. From the engineering point of view, the initial deformation temperature of the alloy is recommended to be 1200 ℃, and the low speed deformation principle (0.01-0.1 s^-1) is adopted. In order to obtain relatively uniform forging microstructure, the final forging temperature should be higher than 1050 ℃, and the forging process can be completed in multiple heats. After GJB 3782 standard recommended multistage heat treatment, there are a lot of dispersed particles in the grain γ′ nano precipitates play a good role in precipitation strengthening.

Key words: GH4698 alloy, hot deformation, microstructure, properties

CLC Number:

TG335.3

Wang Yan, Gu Yu, Wang Jue, Li Jidong. Microstructure evolution mechanism of nickel-based superalloy GH4698 during hot deformation[J]. Heat Treatment of Metals, 2021, 46(6): 221-224.

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