冷变形过共析珠光体钢丝的微观组织演化

发布时间：2018-03-18 16:11

本文选题：冷变形　切入点：过共析钢丝　出处：《材料热处理学报》2015年08期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The microstructure changes of hypereutectoid pearlite wire during cold drawing were observed and studied. The texture changes of hypereutectoid pearlite wire during deformation were measured by means of backscatter electron diffraction (EBSD). The cementite in hypereutectoid steel shows good deformation ability. With the increase of strain, the deformation of cementite lamellae gradually turns to drawing direction after bending, shearing and drawing. Finally, a fibrous structure parallel to the drawing direction was formed. Cold deformation also caused partial dissolution of the cementite. Quantitative tests showed that the dissolution of the cementite increased with the increase of the strain. As the dissolved carbon atoms entered the ferrite lattice, The lattice lattice constant of ferrite becomes larger, and the diffraction peak shifts slightly to the left with the increase of strain. The texture orientation after drawing is mainly 110 wire texture parallel to drawing direction, and the texture strength increases gradually with the increase of drawing strain.
【作者单位】：江苏兴达钢帘线股份有限公司;江苏省结构与功能复合材料重点实验室;东南大学材料科学与工程学院;
【基金】：江苏省自然科学基金青年基金(BK20140584) 江苏省博士后科研资助计划(1201082C);江苏省博士后科研资助计划(1401075C)
【分类号】：TG142.1

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