共析珠光体钢在冷轧过程中的组织变化

用SEM、TEM及XRD等方法研究了共析钢中珠光体经40％-90％的冷轧变形后所产生的显微组织变化．接渗碳体形态特点，变形珠光体组织可分为以下3种类型：(1)不规则弯曲片层型，即变形后的渗碳体与轧制面呈大角度偏离且不规则弯曲的珠光体．(2)带有剪切带的粗大片层型，即被渗碳体剪切带分开且变形轻微的珠光体．(3)精细片层型，即与轧制方向平行排列、片间距细小且渗碳体严重变形的珠光体．精细片层区域的比例随着轧制压下率的提高而增大．此外，重度冷轧变形还引起渗碳体严重塑性变形和部分溶解．

Microstructure changes of eutectoid pearlitic steel during cold rolling

The microstructure changes of pearlitic eutectoid steel induced by cold rolling were investigated by using SEM, TEM and XRD etc. According to the morphological characteristics of cementite lamellae, the deformed pearlite can be divided into three kinds: irregularly bent lamella (pearlite lamella originally inclined with large angles to the rolling plane and irregularly bent after deformation); coarse lamellae with shear-band (the rhomboidal blocks of weakly deformed lamella bounded by shear band) and fine lamella (heavily deformed lamella aligned parallel to the rolling direction with fine interlamellar spacing). As the rolling reduction increases, the proportion of fine lamella increases. Heavy cold rolling also induced the severe plastic deformation and dissolution of cementite.