热模拟试验机试样热压缩数值分析  

Numerical analysis on thermal compression of sample used in a thermal simulation testing machine

作　　者：谢正俊 樊田 谢剑波 XIE Zhengjun;FAN Tian;XIE Jianbo(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621000,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621000 [2]上海大学材料科学与工程学院,上海200444

出　　处：《物理测试》2021年第5期9-14,共6页Physics Examination and Testing

摘　　要：针对热模拟试验机(Gleeble 3500)热轧试样高温压缩试验的动态变形、材料内部应力、组织损伤、动态应变量及材料各部分塑性变形差异性等问题,利用Deform-3D软件数值仿真开展研究。结果表明:随着压缩的进行,试样表面积先减少后增加,约在5 s时表面积最小,下降率为4.1%,在8.4 s后剧烈增加,增加率为14.4%。在整个压缩阶段试样两端承受应力最大约为70 MPa。破坏性损伤Damage值为0.22,应变为1.43,顶部区域变形速率最大为1.19 mm/s。空冷和淬火冷却过程中,试样顶底边界面角部区域温度下降最快,高温区域变化趋势为由长方形向圆角长方形,再向椭圆形转变。Deform-3D numerical simulation software was used to simulate the dynamic deformation,internal stress,microstructure damage,dynamic strain and plastic deformation differences of the hot-rolled specimens in the high temperature compression tests using a thermal simulation testing machine(Gleeble 3500).The results showed that the surface area of the sample first decreased and then increased in the process of compression.The surface area was the minimum at about 5 s,and the decrease percentage was 4.1%.Then it increased sharply after 8.4 s with the increase percentage of 14.4%.In the whole compression stage,the maximum stress on both ends of the specimen was about 70 MPa.The value of destructive damage(Damage)was 0.22,the strain was 1.43,and the maximum deformation rate of the top region was 1.19 mm/s.In the process of air cooling and quenching,the temperatures in the corner region of top and bottom boundary surface decreased fastest.The change trend of high-temperature region was transformed from rectangle to rounded rectangle,and then to ellipse.

关 键 词：热模拟试验机 散热 数值仿真 

分 类 号：TG306[金属学及工艺—金属压力加工]