| 汽车用U型螺栓断裂分析 |
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| 引用本文： | 张彦文,王继辉,陈宇.汽车用U型螺栓断裂分析[J].理化检验(物理分册),2010(6):403-405,408. |
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| 作者姓名： | 张彦文 王继辉 陈宇 |
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| 作者单位： | [1]武汉理工大学材料科学与工程学院,武汉430070 [2]武钢研究院检测所,武汉430080 |
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| 摘 要： | 某汽车用U型螺栓制成后在搬动过程中发生断裂,断裂位于U型螺栓感应加热的锻打弯曲部位。通过宏观观察、扫描电镜微观观察以及金相检验等方法对螺栓的断裂原因进行了分析。结果表明:由于该U型螺栓锻打弯曲部位感应加热温度过高导致局部过烧,使其在锻打应力的作用下沿晶开裂形成热裂纹;冷却后该裂纹在搬动过程中的低应力作用下扩展导致螺栓最终脆断。
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| 关 键 词： | U型螺栓 感应加热 过烧 热裂纹 |
Fracture Analysis of U Shape Bolts for Automobile |
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| ZHANG Yan-wen,WANG Ji-hui,CHEN Yu.Fracture Analysis of U Shape Bolts for Automobile[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2010(6):403-405,408. |
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| Authors: | ZHANG Yan-wen WANG Ji-hui CHEN Yu |
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| Affiliation: | 1. Materials Institute, Wuhan University of Science and Technology, Wuhan 430070, China; 2. Research and Development Center, Wuhan Iron and Steel Company, Wuhan 430080, China) |
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| Abstract: | U shape bolts using for automobile fractured during transport process. The fracture position was located at the forged and bended part. The fractured bolt was researched by macroscopic and microcopic analysis. The results show that over burning happened because of the too high inductive heating temperature and hot crack formed by stresed. Finally after cooling the crack extended under low stress and led to the fracture. |
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| Keywords: | U shape bolt induction heating overburning hot crack |
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