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利用扫描电子显微镜(SEM)、电子背散射衍射(EBSD)研究了退火时间对双向温轧中碳马氏体钢组织演变的影响规律。结果表明,轧前回火马氏体分解成铁素体和渗碳体颗粒,轧制过程中铁素体发生动态回复和动态再结晶,获得了在铁素体基体上渗碳体颗粒弥散分布的复相组织。轧后铁素体晶粒尺寸为3.14μm,小角度晶界约占49.3%,650℃退火保温1 h,铁素体发生再结晶,平均晶粒尺寸为2.87μm,小角度晶界所占比例减小到46.5%。随着退火时间的延长,平均铁素体晶粒尺寸增加,小角度晶界所占比例逐渐减小。
The influence of annealing time on the microstructure evolution of two-way warm-rolled medium carbon martensitic steel was studied by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results show that the tempered martensite before rolling is decomposed into ferrite and cementite particles, and the ferrite undergoes dynamic recovery and dynamic recrystallization during the rolling. The dispersion of cementite particles on the ferrite matrix is obtained Phase organization. After rolling, the ferrite grain size is 3.14μm, the small-angle grain boundary is about 49.3% and the annealing is carried out at 650 ℃ for 1 h. The ferrite recrystallizes with an average grain size of 2.87μm. The proportion of small-angle grain boundaries Reduced to 46.5%. With the extension of annealing time, the average ferrite grain size increases, the proportion of small-angle grain boundaries gradually decreases.