应变对PH13-8Mo钢在1050～1150℃时变形组织的影响

Effect of Strain on Microstructure Evolution of PH13-8Mo Steel Deformed at 1050 to 1150℃

采用Gleeble热模拟试验机,对PH13-8Mo钢进行热变形模拟实验,研究了应变对PH13-8Mo钢在应变速率为10/s,变形温度为1 050～1 150℃时变形组织的影响。结果表明,PH13-8Mo钢在1 050℃、应变达到0.69时仍未发生完全再结晶,但在1 100和1 150℃、应变分别达到0.29和0.24后,发生了明显的完全再结晶。再结晶体积分数随应变增加和变形温度升高而逐渐增大,直至发生完全再结晶。当应变<0.29时,再结晶晶粒尺寸和试样的平均晶粒尺寸随应变增加较快地减小;当应变>0.29后,再结晶晶粒尺寸和试样的平均晶粒尺寸随应变增加缓慢地减小。再结晶晶粒尺寸和试样的平均晶粒尺寸均随变形温度的升高而增大。

The influence of strain on deformation microstructure evolution of PH13-8Mo steel was investigated through isothermal compression tests using Gleeble thermal-mechanical simulator within the temperature range of 1 050 to 1 150℃ and with the strain rate of 10/s.The results show that dynamic recrystallization occurs partially when the strain reaches maximum 0.69 at 1 050℃.However,at 1 100℃ and 1 150℃,full dynamic recrystallization has occurred when the strain reaches 0.29 and 0.24,respectively.The fraction of recrystallization increases with increasing strain and deformation temperature.The recrystallized grain size and average grain size of the impacted steel markedly reduce with the strain before the strain reaches 0.29,then slowly reduce.However,the recrystallized grain size and average grain size of the impacted steel both increase with increasing deformation temperature.