Transactions of Materials and Heat Treatment

Title：Modeling of dynamic recrystallization for as-cast heat-resistant alloy steel P91

Authors： Li Zhenxiao1 2 Lei Bufang1 2 Fu Jianhua1 2 Deng Kui1 2

Unit： 1.School of Material Science and Engineering Taiyuan University of Science and Technology Taiyuan 030024 China 2. Shanxi Key Laboratory of Metallic Materials Forming Theory and Technology Taiyuan University of Science and Technology Taiyuan 030024 China

KeyWords： as-cast heat-resistant alloy steel P91 true stress-strain curve micro-structure dynamic recrystallization model

ClassificationCode：

year,vol(issue):pagenumber：2016,41(1):121-126

Abstract：

Using the Gleeble-3500 thermal simulation test enginery, a single hot compression was carried out at the deformation temperature ranging 900-1200 ℃ ,the strain rate ranging 0.01-5 s-1 and the deformation degree 60%. So the true stress-strain curves of as-cast heat-resistant alloy steel P91 were obtained. The analysis of the curves shows that the dynamic recrystallization occurs in the process of thermal deformation. The curves are divided into three types, including work hardening,dynamic recovery and recrystallization. Micro-structure analysis was carried out on the sample of thermal deformation. The influences of the deformation temperature and strain rate on the dynamic recrystallization micro-structure were analyzed. On the basis of Avrami equation, using the data of stress,strain and the average grain size, the dynamic recrystallization kinetics model,kinematics model and grain size model were established respectively through the analysis of linear regression，and then the complete dynamic recrystallization model of as-cast heat-resistant alloy steel P91 was obtained.

Funds：

国家自然科学基金重点项目（51135007）；山西省回国留学人员科研资助项目（2015-086）

李振晓（1991-），女，硕士研究生

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