Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior and finite element simulation on Si-Cr-Mo modified H13 hot work die steel

Authors： Chen Guoxin1 2 Sang Baoguang1 Liu Mingze1 Yan Jin1 Liu Hongwei3 Feng Shaobo3

Unit： 1.Dalian Polytechnic University 2.Qingdao Premier Bearing Institute 3.Institute of Metal Research Chinese Academy of Sciences

KeyWords： 3Cr2Mo3 steel constitutive equation thermal processing map microstructures deformation temperature strain rate

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2023,48(2):215-223

Abstract：

Hot compression tests were conducted on the self-developed Si-Cr-Mo modified H13 hot work die steel-3Cr2Mo3 steel by thermal simulation testing machine Gleeble-3800, and the thermal deformation behavior was studied at the deformation temperatures of 950-1200 ℃ and the strain rates of 0.01-10 s-1. Then, based on the true stress-true strain curves obtained from the test, the Arrhenius type constitutive equation was established, and the true strain compensation was performed on it. Furthermore, the thermal processing map of 3Cr2Mo3 steel was constructed by the dynamic material model, and the optimal thermal processing range was obtained. Finally, the relationship between temperature field and microstructure of 3Cr2Mo3 steel during the thermal deformation process was studied by finite element software DEFORM and optical microscopy. The results show that the true stress of 3Cr2Mo3 steel is affected by the strain rate and the deformation temperature, there is an obvious dynamic softening characteristic at low strain rate (0.01 s-1), and the sixth degree true strain compensation type constitutive equation has high fitting accuracy. Within the range of test conditions, the optimum thermal processing range of 3Cr2Mo3 steel is the deformation temperature of 1110-1200 ℃ and the train rate of 0.01-1 s-1. The temperature field results of finite element software DEFORM show that with the increasing of deformation temperature and the decreasing of strain rate, the temperature field distribution at the core and surface of specimen is uniform, and the microstructures are uniform and fine dynamic recrystallized grains.

Funds：

广东省重点领域研发计划(2020B010184001）；辽宁省教育厅自然科学基础项目(J2020050)

作者简介：陈国鑫（1996-），男，硕士,工程师，E-mail：gxchen0911@163.com；通信作者：桑宝光（1980-），男，博士，副教授，E-mail：bgsang@163.com

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