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采用光学金相和扫描电镜技术相结合的原位观察方法研究了一种低碳贝氏体钢在600℃等温过程中的组织演变规律。结果表明,在等温过程中低碳贝氏体钢中的组织是以类似于变形金属的回复和再结晶的方式向平衡组织转变,最终的转变产物为多边形铁素体。回复阶段在微观上主要表现为贝氏体板条内的位错重新分布形成胞状亚晶。在整个等温过程中,原奥氏体晶界是比较稳定的,在铁素体长大时有可能被穿越。而再结晶后形成的铁素体组织是以一种“包晶”的方式逐渐吞噬其他非平衡组织而长大。
The microstructure evolution of a low-carbon bainitic steel during isothermal process at 600 ℃ was investigated by in-situ observation combined with optical metallography and scanning electron microscopy. The results show that the microstructure of the low carbon bainitic steel changes to the equilibrium structure in a similar way to the recovery and recrystallization of the deformed metal during the isothermal process. The final transformation product is polygonal ferrite. At the microscopic stage, the rejuvenation mainly showed dislocation dislocation in bainite lath to form cellular subgrain. During the whole isothermal process, the former austenite grain boundaries are relatively stable, and may be crossed when the ferrite grows. The recrystallization of ferrite formed by a “peritectic ” way gradually phagocytosis of other non-equilibrium tissue and grow up.