【摘要】 通过金相实验,对20Cr Mn Ti H钢在不同加热温度(850~1150℃)及保温时间(10~40 min)下的晶粒长大规律进行了研究,基于所得数据,通过回归分析建立了适用于此种材料加热与保温过程的奥氏体晶粒长大模型,并将该模型引入有限元软件对奥氏体晶粒长大行为进行数值模拟。结果表明,奥氏体晶粒尺寸随加热温度升高而增大,且长大速度越来越快,随保温时间延长而增大,且长大速度不断减缓;1000℃为20Cr Mn Ti H钢的粗化温度,T≤1000℃时,晶粒长大缓慢,T≥1000℃时,晶粒急剧长大;有限元软件成功模拟了奥氏体晶粒长大过程,模拟结果与实验结果相符。更多还原

【Abstract】 Austenite grain growth behavior of 20 Cr Mn Ti H steel in the process of heating at different temperatures for different holding time was investigated based on metallographic experiment,and the austenite grain growth model was established by regression on the basis of experimental data. The mathematical model which can describe austenite grain growth behavior of the steel was introduced in the subroutine of finite simulation software. The results show that the size of austenite grain will grow up with the increasing temperature,and the growth rate is faster. The size of austenite grain will grow up with the increasing holding time,and the growth rate is more and more slowly. The grain coarsening temperature of the 20 Cr Mn Ti H steel is 1000 ℃ when temperature is not more than 1000 ℃,the growth rate is slowly when temperature is less than 1000 ℃. The grow rate of size of grain is sharp; the simulation of austenite grain growth behavior on finite limited software is successful. The predictive result is agree with that of experimental result.更多还原