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。
Fe-24Mn-0.7Si-1.0Al TWIP steel was annealed at 700 ℃ and 1000 ℃ for different time,respectively,and the effect of annealing heat treatment on microstructure and hardness of Fe-24Mn-0.7Si-1.0Al TWIP steels was investigated.The results show recrystallization nuclei are formed by sub-boundary migration mechanism,and then grow to recrystallized grains.The recrystallization is finished for the alloy annealed at 700 ℃ for 5 min or at 1000 ℃ for 1 min.After recrystallization is finished,the grain size of the steel increases quickly at first and then tends to be stable,and its hardness decreases sharply at first and then slowly with increasing annealing time.The decrease of hardness is primarily due to the annihilation of dislocations during recrystallization.
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