喷雾组合控冷技术对弹簧钢54SiCr6组织性能的影响

Effect of Spray Combined Cooling Control Technology on Microstructure and Properties of Spring Steel 54SiCr6

采用金相、硬度、拉伸等试验方法,研究高速线材不同控冷技术对54SiCr6弹簧钢组织形貌、力学性能和表面质量的影响。结果表明,54SiCr6弹簧钢采用喷雾组合控冷的各项性能明显优于传统风冷控冷工艺。当采用传统风冷工艺时,盘卷通盘力学性能稳定性稍差,铁素体析出较多,铁素体析出增加脱碳层深度;当吐丝温度为850℃,喷雾压力为1 MPa时显著增加冷却速度,抑制铁素体析出降低脱碳层深度,盘卷力学性能均匀性优于风冷工艺;当吐丝温度为850℃,喷雾压力为4 MPa和3 MPa时,冷却速度显著提升,盘卷基体出现马氏体组织,较大降低盘卷的力学性能稳定性;当吐丝温度为850℃,喷雾压力为2 MPa时可以显著提高盘卷力学性能和均匀性,抑制铁素体析出,从而降低脱碳层深度,同时硬度的提升降低了盘卷表面磕碰伤,提高客户拉拔表面质量和作业率。

The effect of microstructure morophology,mechanical properties,and surface quality of 54SiCr6 spring steel under different controlled cooling techniques for high-speed wire rods was studied by metallographic,hardness,and tensile testing methods.The results show that the performance of spring steel 54SiCr6 with spray combined cooling control is obviously better than that of the traditional air cooling control process.When the traditional air cooling process is used,the mechanical performance stability of the coil is slightly worse,with more ferrite precipitation,which increases the depth of decarburization layer;When the spinning temperature is 850℃and the spray pressure is 1 MPa,the cooling rate is significantly increased,and the ferrite precipitation is inhibited,and the decarburization depth is reduced.The mechanical property uniformity of coiling is better than that of air cooling process;When the spinning temperature is 850℃,and the spray pressure is 4 MPa and 3 MPa,the cooling rate is significantly increased,and martensite structure appears in the coiling matrix,which greatly reduces the mechanical property stability of the coiling;When the spinning temperature is 850℃and the spray pressure is 2 MPa,the mechanical properties and uniformity of the wire coil can be significantly improved,the ferrite precipitation can be inhibited,and the depth of decarburization layer can be reduced.At the same time,the increase of hardness reduces the bump on the surface of the coil,and improves the surface quality and operation rate of the customer.