【作者】 焦永星； 刘建生； 李景丹； 段兴旺； 郑晓华；

【Author】 Yong-xing Jiao;Jian-sheng Liu;Jing-dan Li;Xing-wang Duan;Xiao-hua Zheng;College of Materials Science and Engineering, Taiyuan University of Science and Technology;

【机构】 太原科技大学材料科学与工程学院；

【摘要】 在变形温度1000℃-1200℃、变形量10%-50%下对06Cr19Ni9NbN钢进行平面应变压缩实验,并借助Deform-3D对该钢实际压缩过程进行数值模拟分析。依据塑性变形基本假设、宏观连续介质力学以及热力学原理,采用数学解析方法建立该钢变形区域的应变、应力、及温度场数学模型。结果表明:压缩实验中试件表面不同区域的温度值与数值模拟值相一致,验证了所做数值模拟准确性;应力数学模型建立考虑温度和应变速率的变化,温度数学模型分为变形区、非变形区和与模具接触区三部分建立,有效提高了新模型的预测精度;数值模拟和模型计算的相对误差范围为-8%-8%,表明所建模型能准确表征该钢平面压缩过程中热力耦合变形机制。更多还原

【Abstract】 The process of plane strain compression of 06Cr19Ni9NbN steel is investigated and carried out in the temperature range of 1000℃-1200℃ and the reduction ratio range of 10%-50%. By means of the Deform-3D, the process of plane strain compression of the steel is analyzed. Based on the plastic forming principle, macroscopic continuum mechanics and thermodynamics, the mathematical models of strain, stress, and temperature are established by a mathematical analysis method. The results show that the distribution of surface temperature obtained by the compression experiment and DEFORM simulation is consistent, indicating that the results of simulation are accurate. The stress models take account of the variation of temperature and strain rate during compression process and the new temperature models are established in three regions respectively, which improves the prediction precision of the new models. The relative error of simulation and calculation is in the range of-8%-8%, which indicates that the new models are accurate to characterize the mechanism of coupled thermal-mechanical during plane strain compression.更多还原