55SiCr钢悬架弹簧尺寸超差原因分析  

Analysis of size out-of-tolerance of 55SiCr steel suspension spring

作　　者：孙国才 张宇 袁长生 Sun Guocai;Zhang Yu;Yuan Changsheng(Institute of Research of Iron and Steel,Shasteel,Zhangjiagang Jiangsu 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《金属热处理》2022年第12期289-292,共4页Heat Treatment of Metals

摘　　要：某55SiCr钢悬架弹簧在卷制过程中部分弹簧尺寸超过公差允许范围,采用光学显微镜、电子探针和X射线衍射仪对弹簧尺寸超差的原因进行了分析。结果表明,尺寸超差弹簧用55SiCr钢线热处理过程中冷却不足导致其含有过多残留奥氏体,是弹簧产生尺寸超差的原因。通过降低冷却水温度,能够有效降低钢线中残留奥氏体的含量。Sizes of 55SiCr steel suspension springs were found out-of-tolerance in the rolling process.The reason of the size out-of-tolerance was analyzed by means of OM,EMPA and XRD.The results show that excessive retained austenite is found in the 55SiCr steel wires to produce the suspension springs due to insufficient cooling during heat treatment,which is the main reason of size out-of-tolerance.Content of retained austenite in the steel wire can be effectively reduced by reducing the temperature of cooling water.

关 键 词：55SiCr钢 悬架弹簧 尺寸超差 残留奥氏体 

分 类 号：TG111.5[金属学及工艺—物理冶金]