论文部分内容阅读
采用热模拟实验测得12%Cr流变应力曲线并得到其流变应力方程。采用有限元分析方法研究了JTS拔长法预冷工艺,分析了不同冷却条件下锻件内部的温度场变化情况,锻件表面的温度梯度随喷水冷却时间的增加而增加,随在空气中停留时间的增加而减小。结合12%Cr热塑性曲线确定了最优冷却方案。并对JTS拔长法及FM拔长法进行了对比研究。通过比较锻件内部的等效应变,获得了JTS拔长法锻件内部的等效应变分布特点,相对于FM拔长法,JTS拔长法可以在锻件内部较大范围内获得更大的等效应变。
The flow stress curve of 12% Cr was obtained by thermal simulation and the flow stress equation was obtained. The finite element method was used to study the pre-cooling process of JTS drawing method. The temperature field changes of the forging under different cooling conditions were analyzed. The temperature gradient of the forging surface increased with the increase of the cooling water spraying time. With the residence time in the air Increase and decrease. Combined with 12% Cr thermoplastic curve to determine the optimal cooling scheme. JTS pull-out method and FM pull-out method were compared. By comparing the equivalent strain in the forging, the equivalent strain distribution inside the forging JTS was obtained. Compared with the FM stretching method, the JTS stretching method can obtain a larger equivalent strain in the wide range of forging .