一种微合金钢曲轴断裂原因分析  

Fracture analysis of microalloyed steel crankshaft

作　　者：陈晨 刘乐东 陶佳伟 薛晓莹 过春霞 Chen Chen;Liu Ledong;Tao Jiawei;Xue Xiaoying;Guo Chunxia(Jiangying Xingcheng Special Steel Works Co.,Ltd,,Jiangying 214400,Jiangsu,China)

机构地区：[1]江阴兴澄特种钢铁有限公司,江苏江阴214400

出　　处：《特钢技术》2024年第2期30-32,共3页Special Steel Technology

摘　　要：通过化学成分检测、宏观形貌观察、显微组织观察,断口形貌分析和淬硬层硬度检测等测试手段,对微合金曲轴用钢断裂原因进行分析。结果表明:曲轴的失效模式为典型的疲劳断裂,断裂位置处于连杆颈和平衡块的过渡区、即R角区域,断裂的主要原因为R角区域粗糙的加工刀痕产生应力集中,促进了疲劳裂纹的形成,最终导致疲劳断裂。The fracture cause of the microalloyed steel crankshaft was analyzed by methods of chemical composition analysis,microstructure observation,fracture morphology analysis and hardness of hardened layers analysis.The results indicate that the failure mode of the crankshaft is a typical fatigue fracture,with the fracture location in the transition zone between the connecting rod neck and the balance block,namely the R-angle region.The main reason for the fracture is the rough machining tool marks in the R-angle region,which generate stress concentration and promote the formation of fatigue cracks,ultimately leading to fatigue fracture.

关 键 词：微合金钢 曲轴 疲劳断裂 裂纹源 加工刀痕 

分 类 号：TG142[一般工业技术—材料科学与工程]