| 地铁列车转向架断裂原因分析 |
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| 引用本文： | 谭莹,陈明,曹标,司徒铿.地铁列车转向架断裂原因分析[J].理化检验(物理分册),2002,38(8):349-351. |
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| 作者姓名： | 谭莹 陈明 曹标 司徒铿 |
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| 作者单位： | 广州出入境检验检疫局,广州,510623 |
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| 摘 要： | 地铁列车转向架是由钢板焊接而成，在服役一年后断裂，对断裂件进行了断口形貌、金相组织、化学尬发分析及硬度测定。结果表明，断口显示出疲劳断裂痕迹，焊接缺陷是引起疲劳裂纹萌生及扩展的主要原因，而热影响区粗大的贝氏体及低碳马氏体组织的存在加速了疲劳断裂过程，最终导致转向架早期疲劳断裂。
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| 关 键 词： | 地铁列车 原因分析 转向架 焊接缺陷 疲劳断裂 地下铁路 断口形貌 |
| 文章编号： | 1001-4012(2002)08-0349-03 |
| 修稿时间： | 2001年12月31 |
FRACTURE ANALYSIS ON BEARING CANTILEVER OF MOTOR IN SUBWAY TRAIN |
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| TAN Ying,CHEN Ming,CAO Biao,SI Tu keng.FRACTURE ANALYSIS ON BEARING CANTILEVER OF MOTOR IN SUBWAY TRAIN[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2002,38(8):349-351. |
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| Authors: | TAN Ying CHEN Ming CAO Biao SI Tu keng |
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| Abstract: | The bearing cantilever of motor was welded with steel plate and cracked after one year serving. It was analyzed by SEM metallographical examination, chemical testing and hardness measurment. The results showed that the facture was caused by fatigue. It indicated clearly that the cracks initation and extension was caused by welding defects and without heat treatment after welding. |
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| Keywords: | Bearing cantilever Welding defects Fatigue fracture |
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