deform-3D热轧钢板回火过程的温度场模拟.docVIP

deform-3D热轧钢板回火过程的温度场模拟 摘要：本论文利用deform-3D有限元模拟软件，对热轧钢板回火过程的温度场进行模拟计算，分别得到了钢板在淬火、300℃、350℃、400℃、450℃及500℃回火6种热处理工艺的瞬态温度场分布云图和沿钢板宽度方向上的温度分布曲线。模拟结果表明：淬火后沿板宽方向形成了较大的温差和温度梯度，回火后得到了较大程度改善；回火温度对温差及温度梯度的影响不大。温差越大、温度梯度越大，所引起的温度应力越大。因此，回火对减小温度应力有明显的作用。300℃、350℃、400℃、450℃、500℃这些回火温度中，其中500℃的马氏体含量最少，因此所引起的组织应力最小。综合组织应力和温度应力的影响，得出500℃为较佳的回火温度。最后本文对这对上述6种热处理试样进行了实验验证，模拟结果与实验结果基本吻合。6653 关键词：有限元；回火；温度场；残余应力；数值模拟 The temperature field simulation for the hot-rolling sheet steel in the process of tempering Abstract：In this paper, the temperature field of hot rolled plate during tempering process is simulated and calculated by Deform finite element software, and thus the distributions of transient temperature fields of six kinds of technology for heating processing, including the plate at quenching, 300℃ tempering, 350℃ tempering, 400℃ tempering, 450℃ tempering and 500℃ tempering and the curves of temperature drop along the width direction. The results show that: after quenching, it caused a great difference in temperature and the temperature gradient. But it improved the difference in temperature and the temperature gradient obviously after tempering. Tempering temperature on the temperature difference and the influence of the temperature gradient is small.Caused by the temperature difference is bigger, the greater the temperature gradient, the greater the temperature stress .When tempering temperature was set to 300℃, 350℃, 400℃, 450℃, 500℃, respectively, the minimum martensite content was at 500℃, which also caused the minimum transformation stresses. Comprehensive considering transformation stresses and temperature stresses impact, when tempering temperature is at 500℃, the plate has the minimum residual stresses. So we can get that the best tempering solution is at 500℃ tempering. Finally, the simulated results are identical with the actual results by comparison, both are basically consistent. 4.1 引言14 4.2 建立有限元模型14 4.3 热轧钢板淬火过程的温度场模拟15 4.4 热轧钢板回火过程的温度场模拟18 4.5数值模拟结果及分析19