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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。
The growth of 20Cr Mn Ti H steel at different heating temperatures (850 ~ 1150 ℃) and holding time (10 ~ 40 min) was studied by metallographic experiments. Based on the obtained data, regression analysis was established It is suitable for the grain growth of austenite in the heating and holding process of this kind of material. The model is introduced into the finite element software to simulate the grain growth of austenite. The results show that the grain size of austenite increases with the increase of heating temperature, and the growth rate increases faster and faster with the increase of holding time, and the growth rate slows down continuously. The grain size of 20Cr Mn Ti H steel , The grain grows slowly when T≤1000 ℃, and the grain grows rapidly when T≥1000 ℃. The finite element software successfully simulates the grain growth of austenite and the simulation results are consistent with the experimental results .