Transactions of Materials and Heat Treatment

Title：Rheological behavior and microstructure of super alloy GH4698 during deformation

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ClassificationCode：GT316.3

year,vol(issue):pagenumber：2020,45(1):193-199

Abstract：

High temperature compression test was conducted by the thermal simulation test machine, and the rheological behavior of super alloy GH4698 under different deformation temperatures (950-1200 ℃) and strain rates (0.01-10 s-1) was studied. Then, the constitutive equation based on rheological curves and the thermal processing map based on dynamic material model were established respectively, and the microstructure analysis of deformed specimens was conducted by scanning electron microscopy and backscattered electron diffraction (EBSD). The results show that the rheological stress of super alloy GH4698 increases with the decreasing of deformation temperature and the acceleration of strain rate, and super alloy GH4698 displays a better hot working behavior under the deformation temperature of 1000-1200 ℃ and the strain rate of 0.01-0.05 s-1. Furthermore, in high and low power dissipation rate regions, as the power dissipation rate increases, the percentage of dynamic recrystallization increases, the size of average recrystallization grain increases, and the fraction of large angle grain boundary increases.

Funds：

国家科技重大专项基金资助项目(2012ZX04010-081)

左正(1976-)，男，学士，高级工程师 E-mail：zzhm5132@126.com 通讯作者：张文文(1981-)，男，硕士，高级实验师 E-mail：zww@ysu.edu.cn

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