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利用热力模拟实验研究铸态耐热合金钢T/P91材料在热加工温度范围900~1200℃、应变速率范围0.01~5 s-1、变形量60%、70%下的真应力-应变曲线,并建立铸态T/P91合金钢的热变形本构方程;利用DMM动态材料模型计算出铸态T/P91合金钢在热变形中的耗散因子和流变失稳判据,绘制出热加工图。结果表明,热加工图预测的安全区晶粒组织均匀、组织易出现失稳开裂和组织粗大的缺陷,T/P91合金钢的热加工要避免高温低应变;利用DEFROM-3D软件通过数值模拟研究挤压工艺参数对挤压过程动态再结晶的影响,制定工艺参数为:挤压温度1500~1200℃,挤压比9,挤压速度26~36 mm/s。
The true stress-strain curve of the as-cast heat-resistant alloy steel T / P91 was investigated by means of the thermodynamic simulation in the temperature range of 900-1200 ℃, strain rate range of 0.01-5s-1, deformation of 60% and 70% And the thermal deformation constitutive equation of the as-cast T / P91 alloy steel was established. The dissipation factor and rheological instability criterion of the as-cast T / P91 alloy steel in the thermal deformation were calculated by using the DMM dynamic material model, Figure The results show that the predicted hot zone has uniform grain structure in the safe zone, instability cracking and coarse structure defects easily occur in the hot zone. Hot working of the T / P91 alloy steel should avoid high temperature and low strain. By using DEFROM-3D software, The influence of extrusion process parameters on the dynamic recrystallization during extrusion was studied. The process parameters were as follows: extrusion temperature 1500 ~ 1200 ℃, extrusion ratio 9, extrusion speed 26 ~ 36 mm / s.