| 重载车辆用扭矩仪主轴断裂失效分析 |
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| 引用本文： | 潘树民,王小海,刘国强,项红岩,于大威,于庆峰. 重载车辆用扭矩仪主轴断裂失效分析[J]. 金属热处理, 2020, 45(5): 257-261. DOI: 10.13251/j.issn.0254-6051.2020.05.049 |
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| 作者姓名： | 潘树民 王小海 刘国强 项红岩 于大威 于庆峰 |
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| 作者单位： | 内蒙古第一机械集团股份有限公司, 内蒙古 包头 014032 |
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| 摘 要： | 采用化学成分、断口形貌、显微组织、硬度检测等方法进行测试和分析,研究了扭矩仪主轴断裂的原因。结果表明:异常显微组织是造成主轴断裂的主要原因。粗大的回火马氏体和由晶界向晶内扩展的上贝氏体组织导致了裂纹的萌生和扩展,形成沿晶+准解理断口形貌;带状组织的存在增大了显微组织和硬度的不均匀性,导致了材料的各向异性,弱化了构件的服役性能;此外,由于拉应力的作用,键槽根部产生的应力集中效应也是导致构件脆性断裂的重要原因。
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| 关 键 词： | 扭矩仪主轴 显微组织 沿晶裂纹 脆性断裂 失效分析 |
| 收稿时间： | 2019-10-17 |
Fracture failure analysis on shaft of torque gauge in heavy duty vehicles |
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| Pan Shumin,Wang Xiaohai,Liu Guoqiang,Xiang Hongyan,Yu Dawei,Yu Qingfeng. Fracture failure analysis on shaft of torque gauge in heavy duty vehicles[J]. Heat Treatment of Metals, 2020, 45(5): 257-261. DOI: 10.13251/j.issn.0254-6051.2020.05.049 |
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| Authors: | Pan Shumin Wang Xiaohai Liu Guoqiang Xiang Hongyan Yu Dawei Yu Qingfeng |
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| Affiliation: | Inner Mongolia First Machinery Group Co., Ltd., Baotou Inner Mongolia 014032, China |
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| Abstract: | To study the crucial reason of fracture of the shaft of torque gauge, chemical composition, fracture morphology, metallographic analysis and hardness were investigated and analyzed. The results show that the major factor of fracture of the shaft is abnormal microstructure. The coarse tempered martensite and the upper bainite which propagates from grain boundaries towards inside of grains bring about the initiation and propagation of crack, and form the morphology along the grain boundaries and quasi-cleavage fracture. The banded structure accelerates the heterogeneity of microstructure and hardness distribution, which results in anisotropism of material and weakens the service performance of the part. In addition, due to the tensile stress, the stress concentration effect at the root of the keyway is also a vital factor of the fracture of shaft. |
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| Keywords: | torque gauge shaft microstructure intergranular crack brittle fracture failure analysis |
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