工程机械涨紧弹簧60Si2Cr磁粉探伤不合格原因分析和工艺改进

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中图分类号：TG304;TG245 文献标识码：B 文章编号：1003-0514（2025）06-0022-04

Analysis of the unqualified reason and process improvement of magnetic particle flaw detection of 6oSi2Cr tension spring for construction machinery

Li Jinrong，Long Jinhua，Chen Xin（Jiangsu TianhuaiPipe Co.， Ltd.，Huaian 223OO2，Jiangsu，China）

Abstract：Inorder to investigate the cause of unqualified magnetic particleflaw detection of6OSiCr tension spring for construction machinery，the failure analysis of the unqualified samples of magnetic particle testing of Φ47 mm 60Si2Cr tension spring was carried out by using optical microscope，scanning electron microscope and other testing equipment.The results showthatthefailure was dueto minordepresions onthe surfaceof the spring.There were severalclear whitelines in thedepression area，and thehardness diference betweenthe white line areaand the surrounding areas was 66to 87HV.The Si，Cr，and Mnelementcontentsinthe whitelinearea were higher thanthose inthesurroundingareas.The whitelinearea corresponded tothecornerofthebillet，andthepresenceofcornercracksandcompositionsegregationinthebiletwere the root causes ofthefailure.Measures such asreducing the cooling intensityofcontinuous castingcoling water，increasing the heating temperature，and extending the holding time were taken to improve thecorner cracksand composition segregationof the billet，thus solving the problem offailed magnetic particle inspection.

Key Words：tension spring；magnetic particle inspection； compositional segregation； angular fissure

涨紧弹簧是工程机械履带涨紧机构的关键零部件之一，起到控制机械零部件减振和消振的作用，如弹簧断裂失效给工程机械使用单位造成重大的经济损失，也给机械正常运行构成安全隐患[-4]。（剩余3866字）