| 机车车钩断裂分析 |
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| 引用本文： | 程年云.机车车钩断裂分析[J].理化检验(物理分册),2003,39(9):485-487. |
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| 作者姓名： | 程年云 |
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| 作者单位： | 武汉江岸车辆厂,武汉,430012 |
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| 摘 要： | 某机车在运行中其车钩发生断裂。对断裂车钩进行了断口观察、化学成分复验、力学性能测试和夹杂物及显微组织检验。结果表明，该车钩退火处理前已存在的铸造裂纹成为疲劳源，退火处理时的过热又造成钩体表面氧化和严重脱碳，尤其钩腕处的晶粒度达到2～3级，大大降低了车钩的力学性能，在综合因素作用下导致车钩疲劳断裂。
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| 关 键 词： | 机车 车钩 断裂分析 铸造裂纹 氧化脱碳 疲劳断裂 断口观察 力学性能测试 |
| 文章编号： | 1001-4012(2003)09-0485-03 |
| 修稿时间： | 2002年12月16 |
FRACTURE ANALYSIS OF LOCOMOTIVE COUPLER |
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| CHENG Nian-yun.FRACTURE ANALYSIS OF LOCOMOTIVE COUPLER[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2003,39(9):485-487. |
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| Authors: | CHENG Nian-yun |
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| Abstract: | Failed locomotive coupler was analyzed by means of fractographic inspection,chemical analysis, mechanical performance testing,inclusion and metallographic examination. The results show that there were casting-crack in coupler before anneal technology and caused serious oxidize decarbonization. All of this factors led to coupler fatigue fracture. |
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| Keywords: | Locomotive coupler Casting-crack Oxidize decarbonization Fatigue fracture |
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