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观察并研究了过共析珠光体钢丝在冷拉过程中的显微组织变化,并通过背散射电子衍射技术(EBSD)测试了变形过程中(应变量为0、0.54、1.58、2.29)过共析珠光体钢丝织构的变化。结果表明,过共析钢中渗碳体表现出良好的变形能力。随着应变量的增加,渗碳体片层经弯曲、剪切、拉伸等变形逐渐转向拉拔方向,最后形成平行于拉拔方向的纤维状组织。冷变形还引起了渗碳体部分溶解,定量测试表明渗碳体的溶解量随着应变量的增加而增加。由于溶解后的碳原子进入到铁素体晶格中,使得铁素体晶格点阵常数变大,其衍射峰随应变量的增加而产生微小左移。拉拔后的织构取向以平行于拉拔方向的<110>丝织构为主,且织构强度随着拉拔应变量增加而逐渐增强。
The microstructural changes of the hypereutectoid pearlite steel during cold drawing were observed and studied. The co-eutectoid pearlite steel was investigated by backscattering electron diffraction (EBSD) Analysis on the change of pearlite steel texture. The results show that the cementite in the hypereutectoid steel shows good deformation capacity. With the increase of strain, the cementite sheet turns to the drawing direction after bending, shearing, stretching and other deformations, finally forming fibrous tissue parallel to the drawing direction. Cold deformation also caused partial dissolution of cementite, and quantitative tests showed that the amount of cementite dissolved increased with the amount of strain. As the dissolved carbon atoms into the ferrite lattice, making ferrite lattice lattice constant becomes larger, the diffraction peak with the amount of strain increases slightly left. The texture orientation after drawing is dominated by the <110> texture parallel to the drawing direction, and the texture strength gradually increases as the drawing strain increases.