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采用电子背散射衍射(EBSD)技术研究了拉拔过程中珠光体钢丝心部织构演变规律.结果表明,经过多道次干拉和淬火处理的钢丝存在强度较小的<110>丝织构,经过湿拉拔后,<110>丝织构强度明显增加.应用黏塑性自洽模型(VPSC),建立了拉拔过程中钢丝心部织构计算模型,预测了织构的演化规律,并用虚拟的单向拉伸实验研究了初始织构对力学行为的影响.预测结果与EBSD测试结果相符,随着拉拔应变的增加,晶粒的<110>取向逐渐转向拉拔方向.在拉拔方向上的反极图中,存在<113>和<012>连线上稳定的取向,靠近<001>和<111>连线上的取向先转向到稳定取向再转向<110>取向,其它取向直接转向<110>取向.随着拉拔应变增加<110>丝织构的体积分数逐渐增加,增加速率逐渐减小.随着初始<110>丝织构体积分数的增加钢丝心部的屈服应力逐渐增加.
Electron backscatter diffraction (EBSD) technique was used to study the texture evolution of the pearlite core in the drawing process. The results show that there are less <110> filaments in the steel wire after multi-pass dry-drawing and quenching treatment , And the strength of <110> wire texture increased obviously after wet drawing.The texture model of wire core during drawing was established by using the visco-plastic self-consistent model (VPSC), and the texture evolution rule was predicted The effect of the initial texture on the mechanical behavior was investigated by a virtual uniaxial tensile test. The predicted results are consistent with the EBSD test results. As the drawing strain increases, the <110> orientation of the grains gradually turns to the pulling direction. There is a stable orientation on the <113> and <012> lines, the orientation near the <001> and <111> lines is first turned to a stable orientation and then the <110> orientation, and the other orientations And the rate of increase gradually decreases with the increase of drawing strain, the volume fraction of <110> silk texture increases gradually with the increase of drawing strain.With the initial <110> increase of wire volume fraction, the yield stress gradually increase.