中文摘要：

对相变诱发塑性钢TRIP780进行了298,333,363 K温度下且应变速率为10-4,10-2,100,102,103 s-1时的单向拉伸试验.分析了TRIP780钢的流动应力对温度和应变速率的敏感性,并讨论了Johnson-Cook （JC）和Khan-Huang-Liang（KHL）流动应力模型对TRIP780钢的适用性.结果表明：TRIP780钢的流动应力呈现对应变速率的正向敏感性和对温度的负向敏感性,且在高应变速率下流动应力对应变速率的敏感性降低;JC模型对TRIP780钢流动应力拟合在小应变水平下比KHL模型更加准确,而KHL模型在大应变水平下有更高的精度.

英文摘要：

Uniaxial tension tests of transformation-induced plasticity （TRIP780） steel at temperatures 298,333,363 K and strain rates 10-4,10-2,100,102,103 s-1 were performed.The sensitivity of the flow stress of TRIP780 steel to temperature and strain rate was analyzed.In addition,the suitability of Johnson-Cook（JC） and Khan-Huang-Liang（KHL） flow stress models to TRIP780 steel was discussed.The results indicate that the flow stress of TRIP780 steel shows positive sensitivity to the strain rate and negative sensitivity to the temperature,and the sensitivity of the flow stress of TRIP780 steel to strain rate decreases at high strain rate.At small strain,the JC model is more accurate for TRIP780 steel than KHL model in the flow stress prediction,while KHL model has higher precision at large strain.