低温轧制提高65Mn盘条塑韧性能机理分析

通过常规工艺、低温开轧、低温精轧3种试验工艺研究了低温轧制对提高65Mn塑韧性能的影响,利用金相显微镜OM、扫描电镜SEM、EBSD等分析了3种试验工艺的组织、大小角度晶界、晶粒尺寸以及片层间距,研究结果表明,低温工艺显著提高弹簧钢的面缩率,降低同圈波动;大小角度晶界、细化的原始奥氏体晶粒与珠光体球团、片层间距是弹簧钢塑韧性能提高的关键所在。

Mechanism and application analysis on improved plasticity and toughness of 65Mn wire rod steel through low-temperature rolling

In the current article,the conventional process,open rolling and finish rolling at low temperature were stud-ied,and influence ofthe rolling at low temperature on improved plasticity and toughness of 65Mn steel was analyzed. Microstructure,angle between grains,grain size and spacing between pearlite lamella were analyzed through optical mi-croscope(OM),scanning electron microscope(SEM)and electron back-scattered diffraction(EBSD). The results showed that the area reduction(Z)of 65Mn steel increased and the circle fluctuations decreased through the process at low temperature. Angel between grains,small grain size and spacing between pearlite lamella were the key to affect the plasticity and toughness of 65Mn steel.