| 转向节早期断裂原因分析 |
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| 引用本文： | 汪秀秀,冯继军,卢柳林,刘胜,张鑫明,孙晓芬.转向节早期断裂原因分析[J].失效分析与预防,2018,13(4):223-227. |
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| 作者姓名： | 汪秀秀 冯继军 卢柳林 刘胜 张鑫明 孙晓芬 |
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| 作者单位： | 东风商用车有限公司 技术中心工艺研究所, 武汉 430056 |
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| 摘 要： | 针对早期频繁断裂的汽车转向节失效样品进行宏观断口分析，并结合扫描电镜、金相分析、化学成分检测和硬度测试等手段，研究结果表明，转向节失效模式为起源于感应淬火过渡区的疲劳开裂。转向节感应淬火硬化层过深，同时加热速率偏低，导致在感应淬火过渡区产生较大内应力，这是导致转向节抗疲劳性能降低的重要原因。根据转向节几何结构进行感应淬火工艺调整，并采取延展硬化层技术要求，消除转向节柱面与法兰端面过渡部分断裂隐患，失效情况得到较好改善。
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| 关 键 词： | 转向节 40Cr 疲劳断裂 感应淬火 淬硬层 |
| 收稿时间： | 2018-01-10 |
Analysis on Early Fracture of Steering Knuckle |
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| WANG Xiu-xiu,FENG Ji-jun,LU Liu-lin,LIU Sheng,ZHANG Xin-ming,Sun Xiao-fen.Analysis on Early Fracture of Steering Knuckle[J].Failure Analysis and Prevention,2018,13(4):223-227. |
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| Authors: | WANG Xiu-xiu FENG Ji-jun LU Liu-lin LIU Sheng ZHANG Xin-ming Sun Xiao-fen |
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| Abstract: | Early fracture frequently occurred to a type of steering knuckles in cars. In order to find out the failure cause, macro and micro observation, microstructure examination, chemical composition analysis and hardness testing were carried out. The results show that the failure mode of the steering knuckle was fatigue fracture, and the micro crack initiated from the transition zone by induction quenching. The thicker induction hardened layer of the steering knuckle and the lower heating rate during induction quenching resulted in larger internal stress in the transition zone, which is the main cause for the poor fatigue resistance of the steering knuckle. Then, according to the geometry structure of the steering knuckle, the induction quenching process got adjusted and the technique of extended hardened layer was adopted to eliminate the potential danger at the transition section between the knuckle cylinder and the end of the flange, which effectively prevented such failure. |
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