Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior and constitutive equations on H13 steel directionally solidified by low voltage pulsed magnetic field

Authors： Zheng Ce1 Li Yingju1 Zhang Jianwei2 Luo Tianjiao1 Yang Yuansheng1

Unit： 1.Institute of Metal Research Chinese Academy of Sciences 2.Xi′an Superalloy Technologies Co. Ltd.

KeyWords： low voltage pulsed magnetic field H13 steel solidification structure thermal deformation thermal processing diagram constitutive model

ClassificationCode：TG142.1+4

year,vol(issue):pagenumber：2023,48(11):221-231

Abstract：

The thermal compression tests on H13 steel directionally solidified by low voltage pulsed magnetic field (LVPMF) were conducted by using thermal simulation testing machine Gleeble-3800, and the thermal deformation behavior of this alloy steel was studied under the deformation temperature of 1000-1150 ℃ and the strain rate of 0.01-10 s-1. Then, the constitutive equations of the samples treated without and with LVPMF were established, the activation energy Q during the thermal deformation process was obtained, and the thermal processing diagram was drawn. The results show that during the directional solidification process of H13 steel, a low voltage pulsed magnetic field (excitation voltage of 200 V, magnetic field frequency of 5 Hz) is introduced, and the primary dendrites and secondary dendrites in the microstructure of the alloy steel are effectively refined. The thermal deformation activation energy Q and the rheological instability area of alloy steel subjected to LVPMF (grain refinement) are smaller, which reduces the band-like structure during the thermal compression process and has more excellent thermal workability.

Funds：

国家重点研发计划（2018YFA0702901）；国家科技重大专项（J2019-Ⅶ-0002-0142）

作者简介：郑策（1992-），男，博士，助理研究员，E-mail：czheng14b@imr.ac.cn；通信作者：李应举（1979-），男，博士，研究员，E-mail：yjli@imr.ac.cn

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