珠光体层片取向对冷拔珠光体钢丝形变的影响

发布时间：2019-06-06 16:25

【摘要】：利用TEM,SEM和纳米压痕仪研究了珠光体钢丝在冷拉拔形变过程中,珠光体层片取向对其形变及力学性能的影响.结果表明:与拉拔轴向夹角较小的珠光体层片,通过珠光体团旋转,使珠光体层片转向平行于拉拔轴向,并率先形成铁素体110丝织构;铁素体中位错由单滑移到多滑移,最终变成同一滑移系的单滑移,位错分布较均匀,渗碳体与铁素体保持协调变形.与拉拔轴向夹角较大的珠光体层片,通过弯折转向接近平行拉拔轴向,渗碳体发生断裂碎化、铁素体中形成位错胞,造成后续形变困难,层片缓慢减薄.经拉拔形变后,平直珠光体的显微硬度高于弯折珠光体,表明接近平行于拉拔轴向的珠光体层片加工硬化率较高,有利于形变强化.
[Abstract]:The influence of the orientation of the pearlite layer on the deformation and mechanical properties of the pearlitic steel wire during cold drawing and deformation is studied by means of TEM, SEM and nanoindentation. The results show that the pearlite layer with the smaller axial included angle is rotated by the pearlite group, so that the pearlite layer is turned to be parallel to the drawing axial direction, and the ferrite 110 wire-woven structure is first formed, and the dislocation in the ferrite is changed from one slip to multiple slip, and finally becomes one slip of the same sliding system. The dislocation distribution is uniform, and the cementite and the ferrite are kept in coordination and deformed. The pearlite layer with the larger included angle of the drawing axial direction is close to the parallel drawing axial direction by bending, the cementite is broken and broken, the dislocation cells are formed in the ferrite, the subsequent deformation is difficult, and the lamellae are slowly thinned. After drawing and deformation, the micro-hardness of the straight pearlite is higher than that of the bent pearlite, indicating that the work hardening rate of the pearlitic layer close to the drawing axial direction is higher, and the deformation strengthening is facilitated.
【作者单位】：东南大学材料科学与工程学院;江苏省(沙钢)钢铁研究院;盛利维尔(中国)新材料技术有限公司;
【基金】：国家自然科学基金项目51371050和51301038 江苏省科技成果转化专项项目BA2014088 江苏省产学研前瞻性研究项目BY2014127-03资助~~
【分类号】：TG356.4

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