316LN不锈钢管道热加工过程的加工图及可加工性

Processing map and character of hot working of 316LN pipe during hot working process

建立了316LN超低碳控氮不锈钢管道的热加工图,并确立了最适宜热加工的工艺范围。利用Gleeble-3500热模拟实验机进行热压缩实验,用以模拟316LN超低碳控氮不锈钢的热加工过程。实验的温度范围是1 173~1 473 K,实验的应变速率范围是0.001~1 s-1。利用热压缩模拟实验得到的真应力-真应变数据,分别绘制出了材料能量耗散效率图和材料失稳图,并将二者叠加绘制出了316LN超低碳控氮不锈钢的加工图。从绘制出的图形可以看出,当温度为1 375~1 450 K、应变速率为0.01~0.1 s-1时,该材料的能量耗散效率达到最大值41%,此时发生了明显的动态再结晶。因此,该区域被确定为316LN超低碳控氮不锈钢热加工的最佳工作范围。

Hot processing maps of 316 LN stainless steel were established, and the optimum condition for hot working of 316 LN stainless steel was determined. Hot compression experiments of the studied steel were conducted at 1 173—1 473 K and with strain rate of 0.001—1 s-1 to physically simulate the hot working of the studied steel. The power dissipation map and instability map of the studied steel were respectively drawn. By overlapping these two maps, the processing map of the studied steel was obtained. From the map, it can be found that when temperature is 1 375—1 450 K and strain rate is 0.01—0.1 s-1, the power dissipation efficiency reaches the maximum value of 41% and dynamic recrystallization occurs. Thus, this area was selected as the optimum hot working condition for the studied steel.