| 柴油机用42CrMo钢高强度螺栓断裂失效分析 |
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| 引用本文： | 焦丽,商海昆,何剑丰,赵英军,张伟民,李卫民,周兰梅.柴油机用42CrMo钢高强度螺栓断裂失效分析[J].金属热处理,2021,46(6):245-249. |
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| 作者姓名： | 焦丽 商海昆 何剑丰 赵英军 张伟民 李卫民 周兰梅 |
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| 作者单位： | 1.河北华北柴油机有限责任公司, 河北 石家庄 0500812.陆军装备部驻石家庄地区第三军事代表室, 河北 石家庄 050081 |
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| 摘 要： | 柴油机用42CrMo钢制高强度螺栓在紧固过程中发生了断裂掉头现象,通过宏观检验、化学成分分析、纤维流线及过渡圆角检验、显微组织检验和扫描电镜分析等手段,并结合螺栓加工工艺,对其断裂原因进行综合分析。结果表明:螺栓调质过程中,在应力集中的头杆结合区产生淬火裂纹并形成陈旧断口,减小了螺栓的有效承载面积,装配应力作用下因相对过载而断裂。头杆结合区过渡圆角半径偏小且加工不良是引发淬火裂纹的关键因素。
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| 关 键 词： | 高强度螺栓 42CrMo钢 淬火裂纹 断口形貌 圆角半径 |
| 收稿时间： | 2020-11-30 |
Fracture failure analysis of 42CrMo steel high strength bolts for diesel engine |
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| Jiao Li,Shang Haikun,He Jianfeng,Zhao Yingjun,Zhang Weimin,Li Weimin,Zhou Lanmei.Fracture failure analysis of 42CrMo steel high strength bolts for diesel engine[J].Heat Treatment of Metals,2021,46(6):245-249. |
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| Authors: | Jiao Li Shang Haikun He Jianfeng Zhao Yingjun Zhang Weimin Li Weimin Zhou Lanmei |
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| Affiliation: | 1. Hebei Huabei Diesel Engine Co., Ltd., Shijiazhuang Hebei 050081, China;2. The 3th Military Representative Office in Shijiazhuang Region of the Army Armament Department, Shijiazhuang Hebei 050081, China |
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| Abstract: | Some 42CrMo steel high strength bolts of diesel engine fractured with their heads dropped in the fastening process. The reasons of fracture were analyzed synthetically by means of macroscopic examination, chemical compositions analysis, fiber streamline examination, transition fillet inspection, metallographic test and SEM analysis, and combined with the bolt processing analysis. The results show that in the process of quenching and tempering, quenching cracks and old fracture surfaces are formed in the head-rod joint zone with stress concentration, which reduces the effective bearing area of the bolt, so that the bolt fractures due to relative overload under assembly stress. The key factor causing the quenching cracks is that the transition fillet radius in the head-rod joint zone is too small and with poor machining. |
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| Keywords: | high strength bolt 42CrMo steel quenching crack fracture morphology fillet radius |
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