Transactions of Materials and Heat Treatment

Title：Constitutive model and hot processing map of 30MnVS nonquenched and tempered steel

Authors： Deng Qingwen 1 Hu Hongbin 1 Yu Kaichang 2 Zhang Hongtao 1 Wang Guowen1 Li Hang1 Deng Lei 2 Wang Xinyun 2

Unit： 1.Hubei Triring Forging Co. Ltd. 2.State Key Laboratory of Material Processing and Die and Mould Technology Huazhong University of Science and Technology

KeyWords： 30MnVS non-quenched and tempered steel constitutive model hot processing map high temperature plasticity dynamic recrystallization

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2025,50(7):248-254

Abstract：

Non-quenched and tempered steel is widely used in key load-bearing components of engines due to its excellent strength-toughness synergy and low carbon emissions advantages throughout its lifecycle. Therefore, the hot deformation behavior of 30MnVS non-quenched and tempered steel at different deformation temperatures (900-1200 ℃), strain rates (0.01-10 s-1) and deformation amounts (10%-30%) was investigated by the Gleeble thermal simulation experiments, and the Arrhenius constitutive equation considering the strain compensation effect was established. Then, combined with the Prasad energy dissipation criterion, the hot processing maps of 30MnVS non-quenched and tempered steel under different strain conditions were constructed, and the process boundary between dynamic recrystallization dominant zones and instability risk regions was clarified. The results indicate that at the high-temperature range of 900-1150 ℃ and the low strain rate range (<1 s-1), the mdynamic recrystallization of material is significant, and the peak stress shows a decay characteristic with the increasing of temperature, with a decrease of more than 30%. When the strain exceeds 0.2, it is necessary to avoid the combinations of processing parameters with a temperature higher than 1000 ℃ and a strain rate exceeding 1 s-1 to avoid the occurrence of rheological instability.

Funds：

襄阳市科技计划项目（关键核心技术攻关专项）

作者简介：邓庆文（1975-），男，学士，高级工程师 E-mail：dqw096@foxmail.com 通信作者：于凯昌（1999-），男，博士研究生 E-mail：d202480507@hust.edu.cn

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