Q345D钢的热变形抗力研究  

Study on Hot Deformation Resistance of Q345D Steel

作　　者：李海阳[1] 纪登鹏 周晓航[1] 张梅[1] Li Haiyang;Ji Dengpeng;Zhou Xiaohang;Zhang Mei(State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)

机构地区：[1]省部共建高品质特殊钢冶金与制备国家重点实验室上海市钢铁冶金新技术开发应用重点实验室和上海大学材料科学与工程学院,上海200072

出　　处：《上海金属》2018年第2期19-23,共5页Shanghai Metals

摘　　要：利用Gleeble-3500热-力模拟试验机,在变形温度为750~1 200℃、应变速率为0.01~10 s^(-1)、应变量为0.7的条件下对Q345D钢进行单道次压缩试验,得到其真应力-真应变曲线,分析了变形温度、应变速率和变形程度对变形抗力的影响。结果表明,降低变形温度和提高变形速率,均可使Q345D钢的变形抗力增大;只有在较低的变形速率和较高的变形温度下,Q345D钢才发生动态再结晶。通过非线性拟合,建立了Q345D钢的变形抗力模型,并与试验变形抗力进行对比分析,结果表明该模型具有较高的拟合精度。The single pass axial compression tests of Q345D steel were conducted on theGleeble-3500thermomechanical simulator at the temperatures of750℃to1200℃and the strain rates of0.01s-1to10s-1with a constant strain of0.7.Based on the true stress-true strain curves,the effects of deformation temperature,strain rate and deformation degree on the deformation resistance were analyzed.The results showed that the deformation resistance increased with the decreasing temperature and the increasing strain rate;The dynamic recrystallization of Q345D steel only occurred at lower strain rate and higher deformation temperature.The deformation resistance model suitable for the Q345D steel was established by means of nonlinear fitting.The high fitting accuracy of that model was proved by comparison with the regressive method and the tested stresses.

关 键 词：Q345D钢 真应力-真应变 变形抗力 数学模型 

分 类 号：TG142.1[一般工业技术—材料科学与工程]