Fracture Analysis of 40Cr Steel Bolt for Tension Wheel of Vehicle
摘 要
某厂汽车张紧轮用40Cr钢螺栓在装机试验时断裂, 为查明断裂的原因, 对其进行了失效分析。结果表明: 该螺栓断裂方式为氢致延迟断裂, 断裂原因是由于其显微组织中存在较多回火马氏体导致螺栓硬度偏高, 同时螺栓中存在微裂纹,在酸洗镀锌工序中引入的氢向裂纹处扩散, 从而诱发了断裂; 建议在加工过程中将螺栓硬度控制在32~34 HRC, 并在适当的温度烘烤足够长的时间以去除氢, 这样有利于抑制其氢致延迟断裂。
Abstract
In a factory, the 40Cr steel bolt for tension wheel of vehicle fractured during trial installation. In order to confirm the fracture reason, the failure analysis was conducted on the bolt. The results show that the fracture mode of the bolt was hydrogen induced delayed fracture. The fracture reasons were that the hardness of the bolt was relatively high due to too many tempered martensite in the microstructure and that the micro-cracks existed in the bolt; The hydrogen introduced during the pickling and galvanizing process diffused into the cracks, resulting in the fracture. To control the bolt hardness in 32-34 HRC during machining process and eliminate the hydrogen by baking at an appropriate temperature for a sufficiently long time will be in favor of preventing the hydrogen induced delayed fracture of bolt.
中图分类号 TG142 DOI 10.11973/jxgccl201610024
所属栏目 失效分析
基金项目
收稿日期 2015/5/5
修改稿日期 2016/8/11
网络出版日期
作者单位点击查看
备注章敬保(1991-), 男, 四川广安人, 硕士研究生。
引用该论文: ZHANG Jing-bao,HU Yang,GAO Guo-qing,YANG Chuan. Fracture Analysis of 40Cr Steel Bolt for Tension Wheel of Vehicle[J]. Materials for mechancial engineering, 2016, 40(10): 108~110
章敬保,胡 洋,高国庆,杨 川. 汽车张紧轮用40Cr钢螺栓断裂失效分析[J]. 机械工程材料, 2016, 40(10): 108~110
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参考文献
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