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采用扫描电镜(SEM)观察了以不同应变量拉拔变形后SWRH72A钢丝的显微组织变化,并测量了钢丝力学性能、磁学性能随应变量增大的变化趋势。试验结果表明,随着拉拔变形应变量的增大,珠光体片层间距逐渐减小,钢丝强度随之升高。由于变形应变量的增大,微缺陷密度升高,钢丝矫顽力Hc和剩余磁化强度Mr都随之变大。而应变量较小时,钢丝比饱和磁化强度基本不变,为227.87 emu/g。当应变量增大到2.60时,样品的比饱和磁化强度升高到233.55 emu/g,计算得知钢丝中渗碳体的质量分数由未变形状态的10.8%降至8.6%。
The microstructural changes of SWRH72A steel wire were investigated by scanning electron microscopy (SEM). The changes of mechanical properties and magnetic properties of SWRH72A steel wire were measured. The experimental results show that with the increase of drawing strain, the spacing of pearlite sheet gradually decreases and the strength of steel wire increases. Due to the increase of deformation strain and micro-defect density, the coercive force Hc and the remanent magnetization Mr of steel wire both become larger. When the amount of strain is small, the specific saturation magnetization of steel wire is almost unchanged at 227.87 emu / g. When the strain increases to 2.60, the specific saturation magnetization increases to 233.55 emu / g, and the calculated mass fraction of cementite in the wire decreases from 10.8% of the undeformed state to 8.6%.