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通过扫描电镜(SEM)和电子背散射衍射技术(EBSD)研究了不同初始组织对中碳钢双向温轧退火后的组织演变以及稳定性变化的影响规律。结果表明,轧后铁素体-珠光体钢的平均晶粒尺寸为1.11μm,小角度晶界占比81%;而马氏体钢平均晶粒尺寸为0.99μm,小角度晶界占比65.3%。随退火时间的延长,铁素体晶粒发生回复再结晶后,铁素体-珠光体钢发生二次再结晶,平均晶粒尺寸不断增大,小角度晶界占比逐渐减小最终趋于平稳,退火8 h后分别为1.89μm和54.9%;而马氏体钢仅发生晶粒的均匀长大,晶粒尺寸稍有增加,小角度晶界比例降低较少,保温8 h后分别为1.43μm和58.1%。因此,马氏体钢轧后显微组织的退火稳定性要高于铁素体-珠光体钢。
The effects of different initial microstructures on the microstructure evolution and the stability of carbon steel after biaxial warm rolling annealing were studied by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results show that the average grain size of the rolled ferrite-pearlite steel is 1.11μm and the small angle grain boundary accounts for 81%. The average grain size of the martensitic steel is 0.99μm, and the small angle grain boundary is 65.3 %. With the extension of annealing time, the recrystallization of ferrite-pearlite occurs after recrystallization of ferrite grains, the average grain size increases continuously, and the proportion of small-angle grain boundaries gradually decreases and finally tends to After 8 h of annealing and annealing, the average grain sizes were 1.89μm and 54.9% respectively. However, the martensite steels only grew uniformly, the grain size slightly increased, and the proportion of small-angle grain boundaries decreased less. After 8 h of incubation, 1.43 μm and 58.1%. Therefore, the microstructure of the martensitic steel annealed higher stability than ferrite - pearlite steel.