Transactions of Materials and Heat Treatment

Title：Dynamic recrystallization behavior for superalloy FGH4096

Authors： Liu Jianxiao Jiang Chao Zhai Yuewen Zhou Leyu Jin Hong

Unit： Beijing Research Institute of Mechanical and Electrical Technology Co. Ltd. CAM

KeyWords： superalloy FGH4096 thermal compression deformation dynamic recrystallization average grain size high temperature deformation behavior

ClassificationCode：TG166.7

year,vol(issue):pagenumber：2023,48(7):242-248

Abstract：

Aiming at the refinement and homogenization control of the recrystallized microstructure in the vacuum isothermal forging process, the thermal simulation compression tests were conducted on Gleeble3500 thermal simulation tester, and the high temperature deformation behavior of alloy under the conditions of deformation temperature of 1020-1140 ℃, strain rate of 0.001-1 s-1 and strain amount of 60% was analyzed. Then, the dynamic recrystallization volume fraction model and average grain size model of superalloy FGH4096 were constructed, and the evolution laws of dynamic recrystallization microstructure during the thermal deformation process of the alloy was revealed. Furthermore, the optimal process parameters were confirmed, and the control of microstructure was realized by controlling the processing window. The experimental results show that the critical strain of the material decreases with increasing of the deformation temperature and increases with increasing of the strain rate. The grain size of the original structure is Grade 6, when lnZ is in the rang of 70.32-75.57, the dynamic recrystallization percentage is more than 90%. When lnZ is in the range of 72.62-74.93, the grain size of recrystallization average grain size is above Grade 8, resulting in uniform and fine structure.

Funds：

中国机械科学研究总院技术发展基金项目

作者简介：刘剑箫（1992-），女，硕士，工程师 E-mail：woshiliujianxiao@126.com 通信作者：姜超（1979-），男，博士，研究员 E-mail：jiangchao@139.com

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