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采用Gleeble-3500热模拟机,对低质量分数钒和高质量分数钒的S30432耐热钢在900~1 100℃及0.001~0.100 s-1变形条件下进行了热压缩试验,研究钒的质量分数对S30432钢动态回复再结晶的影响及作用机理。结果表明,添加质量分数0.18%钒后S30432钢的峰值流变应力增高,再结晶激活能从498增加到562 k J/mol。在1 000和1 050℃,钒对S30432钢的动态回复再结晶的阻碍作用最显著。高质量分数钒的S30432钢中由于析出细小的Z相,它具有强烈钉扎作用,能有效阻碍动态回复再结晶的发生。此外,高质量分数钒钢中固溶原子的增加对动态回复再结晶也有一定的阻碍作用。
The thermal compression tests of S30432 heat-resisting steel with low mass fraction vanadium and high mass fraction vanadium were carried out at 900 ~ 1 100 ℃ and 0.001 ~ 0.100 s-1 using Gleeble-3500 thermal simulator to study the mass fraction of vanadium Effect of recrystallization on dynamic recovery of S30432 steel and its mechanism of action. The results show that the peak flow stress of S30432 steel increases with the addition of 0.18% vanadium, and the recrystallization activation energy increases from 498 to 562 kJ / mol. At 1 000 and 1 050 ℃, vanadium has the most significant impediment to the dynamic recrystallization of S30432 steel. In S30432 steel with high quality fraction vanadium, it has a strong pinning effect due to the precipitation of small Z phase, which can effectively hinder the occurrence of dynamic recovery recrystallization. In addition, the increase of solid solution atoms in the high quality fraction vanadium steel also hinders the dynamic recovery recrystallization.