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利用Gleeble-1500热模拟试验机对热成型钢的高温塑性变形抗力进行研究。将试样在变形温度800～1100℃下,分别以0.1、1、10和25 s-1应变速率进行单向拉伸试验,分析变形温度、变形速率和变形程度与变形抗力的关系。结果证明,热成型钢是应变速率和温度的敏感材料,变形抗力随应变速率的增加而增加,变形速率在10s-1时的变形抗力是变形速率为1 s-1的2倍以上;变形抗力随变形温度的升高而降低。通过线性回归分析,建立了热成型钢高温塑性本构数学模型,并把理论计算与试验数据进行对比,证明了该模型具有良好的曲线拟合特性。
The high temperature plastic deformation resistance of thermoformed steel was studied by Gleeble-1500 thermal simulation test machine. The specimens were subjected to uniaxial tensile tests at strain rates of 800 ~ 1100 ℃ at 0.1, 1, 10 and 25 s-1 respectively. The relationship between deformation temperature, deformation rate, degree of deformation and deformation resistance was analyzed. The results show that thermoformed steel is a sensitive material with strain rate and temperature. The deformation resistance increases with the increase of strain rate. The deformation resistance at 10s-1 is more than twice the deformation rate at 1s-1. The deformation resistance With the deformation temperature decreases. Through the linear regression analysis, the constitutive mathematical model of high temperature plasticity of thermoformed steel was established. The theoretical calculation and experimental data were compared to prove that the model has a good curve fitting property.