Transactions of Materials and Heat Treatment

Title：Hot deformation and dynamic recrystallization model of as-cast 06Cr18Ni11Ti steel

Authors： Lin Yuan Yuan Wuhua

Unit： College of Materials Science and Engineering Hunan University

KeyWords： 06Cr18Ni11Ti steel hot deformation dynamic recrystallization constitutive equation bipyramid sample

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2024,49(10):230-237

Abstract：

The hot deformation behavior of as-cast 06Cr18Ni11Ti steel was studied by numerical simulation and hot compression experiments, the high-temperature rheological constitutive equation was constructed, and the dynamic recrystallization model was established based on the microstructure and work hardening rate. Then, the obtained model was imported into finite element simulation software Deform, and the hot compression experiment process of bipyramidal specimen was simulated and verified. The results show that the rheological curve is DRX type under the condition of high temperature and low strain rate. At high strain rates (1 s-1) or low temperatures (850 ℃), the rheological curve during hot compression appear to be work hardening, but the dynamic recrystallization phenomenon actually exists. The dynamic recrystallization model was constructed, including the critical strain model, the dynamic recrystallization volume fraction model and the recrystallization grain size model. At last, the calculated results of simulation are in good agreement with the results of bipyramidal experiment, and the established model can effectively predict the dynamic recrystallization of as-cast 06Cr18Ni11Ti steel during the forging process.

Funds：

作者简介：林苑（1998-），女，硕士研究生,E-mail：linyuan2309@163.com;通信作者：袁武华（1973-），男，博士，教授,E-mail：yuan46302@163.com

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