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通过对Fe-24Mn-0.7Si-1.0Al TWIP钢分别在700℃和1000℃退火不同时间,研究退火对合金显微结构和硬度的影响,并讨论了合金再结晶行为及其对组织性能的影响规律。结果显示:合金通过亚晶界迁移机制形成再结晶晶核,进而长大实现再结晶。合金分别在700℃保温5 min或1000℃保温1 min即可完成再结晶。完成再结晶后随着保温时间延长,晶粒尺寸先迅速增大后趋于饱和,而合金硬度先快速降低后趋于平缓。再结晶过程中位错的消失是导致硬度下降的主要原因。
The effects of annealing on the microstructure and hardness of the alloy were studied by annealing the Fe-24Mn-0.7Si-1.0Al TWIP steel at 700 ℃ and 1000 ℃ for different periods respectively. The recrystallization behavior and the effect on the microstructure and properties of the alloy were also discussed law. The results show that the alloy forms recrystallized nuclei through the subgrain boundary migration mechanism and then grows to achieve recrystallization. The alloys were annealed at 700 ℃ for 5 min or at 1000 ℃ for 1 min to complete recrystallization. After the completion of recrystallization with the holding time, the grain size increases rapidly and then tends to be saturated, and the alloy hardness decreases rapidly and then tends to be gentle. Disappearance of dislocations during recrystallization is the main reason for the decrease in hardness.