Analysis of fracture and overheating defects in 60Si2CrVA spring steel coil springs
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NETL
NSTL
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维普
某轧钢厂将钢号为60Si2CrVA、尺寸为156 mm × 156 mm的方坯轧成φ60 mm、φ65 mm圆钢,圆钢送弹簧制造厂绕制弹簧,并在绕制弹簧过程中发生开裂.为了找出60Si2CrVA弹簧钢绕簧断裂原因,对弹簧钢解剖取样进行低倍检验、硬度检验、金相检验、断口分析、化学成分分析等检测.结果表明:弹簧钢母材存在严重过热现象从而形成纵向裂纹,并在绕制或淬火过程中因纵向裂纹扩展导致断裂.
A steel rolling plant rolled square billets with a steel grade of 60Si2CrVA and a size of 156 mm × 156 mm intoφ60 mm and φ65 mm round steel.The round steel was sent to the spring manufacturing factory for winding the spring,and cracking occurred during the winding process.In order to find out the reason for the fracture of 60Si2CrVA spring steel coil spring,the spring steel samples were subjected to low magnification inspection,hardness inspection,metallographic inspec-tion,fracture analysis and chemical composition analysis.The results indicated that there was severe overheating in the spring steel base material,leading to the formation of longitudinal cracks.Therefore,the fracture was caused due to longi-tudinal crack propagation in the process of winding or quenching.
NETL
NSTL
万方数据
维普
