ASP生产Ti-IF钢在不同退火过程中再结晶组织和织构演变

Microstructure and texture evolution during different annealing processes in interstitial free steel by ASP

对ASP生产Ti-IF钢的退火再结晶过程分别进行了罩式退火和连续退火模拟实验,通过金相组织观察和力学性能检测,并结合X射线衍射和电子背散射衍射技术,从不同的实验角度对再结晶组织和织构的形成及演变进行了研究.结果表明,由于罩式退火和连续退火两者的热历史过程不同,其再结晶组织转变温度及晶粒度有所不同,但是再结晶核心的形成位置及演变方式趋于一致,形核方式趋向于择优形核.

Microstructure and texture evolution due to recrystallization in cold rolled interstitial free （IF） steel during batch annealing （BA） and continuous annealing （CA） was investigated by mechanical properties testing, optical microscopy, X-ray diffraction and electron back-scattered diffraction. The mechanism responsible for the evolution was discussed experimentally from different aspects. It is shown that batch annealing and continuous annealing have different thermal histories, so the transition temperature of recrystallization and the reerystallized grain size are different. But the nucleation sites and evolution modes of new recrystallization nuclei are consistent, which belong to the same nucleation mechanism. The formation of recrystallization textures is well explained by the oriented nucleation mechanism rather than the selective growth mechanism.