40Cr盘毂裂纹失效分析
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摘要
对40Cr盘毂进行着色渗透法检测时在其齿根处发现裂纹,用体视显微镜观察和分析裂纹及其断口的宏观形貌,用ICP分析盘毂的化学成分,用金相显微镜和扫描电子显微镜观察其显微组织和裂纹断口的微观形貌,用X射线应力仪分析裂纹附近的残余应力。结果表明:40Cr盘毂齿根处为淬火裂纹,淬火时过大的淬火应力导致其在齿根部发生沿晶开裂和大量的二次沿晶微裂纹。针对淬火裂纹产生原因,提出预防和改进措施。
Cracks were found on the root of wheel hub tooth when performing the dye penetrant examination.The macroscopic morphologies of crack and crack fracture were examined by stereo microscope.The ICP analysis was used to analyze the chemical components of 40Cr wheel hub.Microstructure and crack fracture micro-morphology were examined by optical microscope(OM)and scanning electron microscope(SEM).The residual stress near the crack of wheel hub was analyzed by X-ray stress analyzer.The results indicate that the crack on the root of wheel hub tooth is quenching crack.The large quenching stress leads to the intergranular cracking and the formation of small secondary intergranular cracks.Preventions and improvement measures were proposed for quenching cracks.
Cracks were found on the root of wheel hub tooth when performing the dye penetrant examination.The macroscopic morphologies of crack and crack fracture were examined by stereo microscope.The ICP analysis was used to analyze the chemical components of 40Cr wheel hub.Microstructure and crack fracture micro-morphology were examined by optical microscope(OM)and scanning electron microscope(SEM).The residual stress near the crack of wheel hub was analyzed by X-ray stress analyzer.The results indicate that the crack on the root of wheel hub tooth is quenching crack.The large quenching stress leads to the intergranular cracking and the formation of small secondary intergranular cracks.Preventions and improvement measures were proposed for quenching cracks.
引文
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[2]高为国,王高升,李东锋. 45钢齿轮淬火裂纹的形成及扩展[J].湖南工程学院学报(自然版),2012,22(4):13-16.
[3]刘进益.热处理裂纹分析—典型淬火裂纹[J].东方电机,2009(1):44-51.
[4]李亚红,郑淑丽,朱伟强,等. 45钢淬火裂纹分析及改进[J].航天制造技术,2015(5):50-52.
[5]刘宗昌.淬火开裂及防止方法[J].热处理,2010,25(3):72-79.
[6]陈希原. 42CrMo钢汽车前轴淬火开裂原因分析及改进措施[J].金属加工(热加工),2012(S2):130-132.
[7]朱绍华.零件在热处理中的工艺性考虑[J].金属加工(热加工),2011(3):42-42.
[8]江国清,林信智.淬火冷却条件不良造成的淬火裂纹[J].金属加工(热加工),2014(3):20-22.
[9]汪新衡,唐明华,赵健明. 25MnV钢大口径石油套管淬火裂纹成因分析与对策[J].热加工工艺,2017(8):256-259.
[10]王长健. 45钢锥套淬火裂纹失效分析[J].金属热处理,2017,42(4):204-207.
[11]薄鑫涛.热处理应力对淬火裂纹的影响[J].热处理,2017(4):35-35.
[12]李亚欣,刘雅正,赵金锋,等. P110级石油套管淬火裂纹分析[J].金属热处理,2010,35(5):88-92.