| 42CrMo钢连接螺栓断裂分析 |
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| 引用本文： | 焦丽,王国亮,赵阳. 42CrMo钢连接螺栓断裂分析[J]. 热处理, 2020, 0(1): 38-41 |
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| 作者姓名： | 焦丽 王国亮 赵阳 |
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| 作者单位： | 河北华北柴油机有限责任公司 |
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| 摘 要： | 连接柴油机凸轮轴与正时齿轮的42CrMo钢螺栓在试机过程中断裂。对断裂螺栓进行了宏观检验、化学成分分析、硬度测定、金相检验和能谱分析。结果表明:螺栓的化学成分、显微组织和硬度均正常,但氧化物夹杂的含量较高,且最大直径达350μm,大大降低了螺栓的有效承载面积,导致其断裂。
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| 关 键 词： | 连接螺栓 氧化物夹杂 紧固力 |
Analysis on Fracturing of 42 CrMo Steel Connecting Bolt |
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| JIAO Li,WANG Guoliang,ZHAO Yang. Analysis on Fracturing of 42 CrMo Steel Connecting Bolt[J]. Heat Treatment, 2020, 0(1): 38-41 |
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| Authors: | JIAO Li WANG Guoliang ZHAO Yang |
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| Affiliation: | (Hebei Huabei Diesel Engine Co.,Ltd.,Shijiazhuang 050081,Hebei China) |
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| Abstract: | 42CrMo steel bolt,serving to connect camshaft to timing gear in a diesel engine,fractured during trial operation.The fractured bolt was subjected to macro-examination,chemical composition analysis,hardness measurements,metallographic testing,and EDS analysis.The results showed that the bolt provided normal chemical composition,microstructure and hardness,but excess oxide inclusion as maximum diameter as 350μm which considerably reduced effective bearing area of the bolts,thus resulting in its fracturing. |
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| Keywords: | connecting bolt oxide inclusion fastening force |
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