摘要
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 tensile tests of hot stamping steel BR1500HS were performed on Gleeble-1500 thermo-mechanical simulator at 800-1100℃ with constant strain rate of 0.1, 1, 10 and 25 s-1, respectively. The correlativity of deformation temperature, strain rate, deformed degree and flow stress were analyzed. The results show that the flow stress behaviors strongly depend on the deformation temperatures and strain rates. The flow stress decreases with increasing the deformation temperature and/or decreasing strain rate. The flow stress at strain rate of 10 s-1 is 2 times higher than that of 1 s-1. The constitutive equation for the metal is established using multiple linear regression analysis. The model has good characteristics in imitating curves compared with the theory and the research results can prove the effect of the model.
出处
《热加工工艺》
CSCD
北大核心
2012年第14期48-50,55,共4页
Hot Working Technology
基金
上海市数字化汽车车身工程重点实验室资助项目(201003)
关键词
热成型钢
数学模型
高温拉伸试验
变形抗力
hot stamping steel
constitutive equation
hot tensile tests
deformation stress
