锻压技术

低压脉冲磁场定向凝固H13钢热变形行为及本构方程

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

作者：郑策1 李应举1 张建伟2 罗天骄1 杨院生1

单位：1.中国科学院金属研究所 2.西安聚能高温合金材料科技有限公司

关键词：低压脉冲磁场 H13钢凝固组织热变形热加工图本构模型

分类号：TG142.1+4

出版年,卷(期):页码：2023,48(11):221-231

摘要：

采用Gleeble-3800热模拟实验机，对低压脉冲磁场（Low Voltage Pulsed Magnetic Field，LVPMF）定向凝固的H13钢进行了热压缩实验，研究了该合金钢在变形温度为1000~1150 ℃、应变速率为0.01~10 s-1条件下的热变形行为，建立了有无低压脉冲磁场处理样品的本构方程，获得了热变形过程中的激活能Q，并绘制了热加工图。结果表明：在H13钢的定向凝固过程中引入低压脉冲磁场（励磁电压为200 V、磁场频率为5 Hz），合金钢微观组织中的一次枝晶和二次枝晶得到了有效细化。施加低压脉冲磁场（晶粒细化）的合金钢的热变形激活能Q和流变失稳区域较小，减少了热压缩过程中的带状组织，具有更加优异的热加工性。

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.

基金项目：

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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