基于热模拟试验机的大试样平面应变技术  

Large sample plane strain technology based on thermal simulation testing machine

作　　者：史杰杰 王昌[1] 王哲[1] 刘彦宁 李继康[1] SHI Jiejie;WANG Chang;WANG Zhe;LIU Yanning;LI Jikang(Central Iron&Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司,北京100081

出　　处：《理化检验（物理分册）》2024年第9期19-23,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：钢铁研究总院有限公司科技基金项目(23S60500B)。

摘　　要：使用热模拟试验机对大试样低碳钢进行了平面应变压缩热模拟试验,并对其各道次应力-应变曲线及相变温度进行分析,获得了低碳钢变形区的显微组织演变规律。通过调整热模拟试验机的参数,确保大试样在升温、保温和降温过程中保持温度稳定。结果表明:在保温阶段,试样的均温区尺寸(长度×宽度×高度)为30 mm×30 mm×20 mm,温差约为20℃,满足平面应变压缩试验对试样均温性的要求;压缩变形后试样的宽展较小,试样中间区域的显微组织相对均匀,力学性能较稳定。采用热模拟试验机的平面应变技术可以较好地模拟低碳钢压缩变形时的平面应变状态,实现同时分析材料的显微组织和力学性能。A plane strain compression thermal simulation test was conducted on a large sample of low carbon steel using a thermal simulation test machine,and the stress-strain curves at each pass and phase transition temperatures were analyzed.The microstructure evolution law of the deformation zone of low carbon steel was obtained.By adjusting the parameters of the thermal simulation test machine,the temperature stability of the large sample was ensured during the heating,insulation,and cooling tests.The results show that during the insulation stage,the size of the uniform temperature zone of the sample(length×width×height)was 30 mm×30 mm×20 mm,with a temperature difference of about 20℃,which met the requirements of the plane strain compression test for the uniform temperature of the sample.After compression deformation,the lateral spread of the sample was relatively small,the microstructure in the middle area of the sample was relatively uniform,and the mechanical properties were relatively stable.The plane strain technology of the thermal simulation testing machine could simulate the plane strain state of low carbon steel compression deformation well,achieving simultaneous analysis of the microstructure and mechanical properties of the material.

关 键 词：热模拟试验机 平面应变技术 大试样 低碳钢 显微组织 力学性能 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]