低压脉冲磁场定向凝固H13钢热变形行为及本构方程  

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

作　　者：郑策 李应举[1] 张建伟 罗天骄[1] 杨院生[1] Zheng Ce;Li Yingju;Zhang Jianwei;Luo Tianjiao;Yang Yuansheng(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Xi'an Superalloy Technologies Co.,Ltd.,Xi'an 710016,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]西安聚能高温合金材料科技有限公司,陕西西安710016

出　　处：《锻压技术》2023年第11期221-231,共11页Forging & Stamping Technology

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

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.

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：TG142.14[一般工业技术—材料科学与工程]