| 吐丝机螺栓断裂的失效分析 |
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| 引用本文： | 严春莲,温娟,刘晓岚,刘卫平,任群.吐丝机螺栓断裂的失效分析[J].理化检验(物理分册),2008,44(6):316-318. |
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| 作者姓名： | 严春莲 温娟 刘晓岚 刘卫平 任群 |
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| 作者单位： | 首钢技术研究院,理化检测中心,北京,100041 |
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| 摘 要： | 采用化学成分分析、宏观扣微观检验、金相组织分析和力学性能测定等方法分析了吐丝机用高强度螺栓发生断裂的原因。结果表明，由于机加工不当而在螺纹根部产生表面缺陷，并且这些表面缺陷周围在随后的热处理过程中发生全脱碳，大大降低了螺栓的疲劳强度，导致螺栓在使用过程中早期疲劳断裂。
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| 关 键 词： | 螺栓 疲劳断裂 表面缺陷 失效分析 |
FRACTURE ANALYSIS OF A BOLT IN LAYING HEAD |
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| YAN Chun-lian,WEN Juan,LIU Xiao-lan,LIU Wei-ping,REN Qun.FRACTURE ANALYSIS OF A BOLT IN LAYING HEAD[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2008,44(6):316-318. |
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| Authors: | YAN Chun-lian WEN Juan LIU Xiao-lan LIU Wei-ping REN Qun |
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| Affiliation: | (Physics ＆ Chemistry Testing Center, Shougang Technical Research Institure, Beijing 100041, China) |
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| Abstract: | Fracture analysis of a high-strength bolt in laying head is conducted by a variety of means. The results show that a fragile fatigue fracture happened in the bolt. Surface defects in the bottom of screw threads induce a very high degree Of stress concentration due to improper mechanical processing, and full-decarbonization around the defects during the following heat treatment reduces fatigue strength of the bolt greatly, thus resulting in the early fracture of the bolt. |
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| Keywords: | Bolt Fatigue fracture Surface defects Failure analysis |
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