| 异型钢轨矫直断裂原因分析 |
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| 引用本文： | 邓建辉,邓勇,吴雄先.异型钢轨矫直断裂原因分析[J].理化检验(物理分册),2006,42(9):479-481. |
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| 作者姓名： | 邓建辉 邓勇 吴雄先 |
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| 作者单位： | 四川省攀钢钢铁研究院,攀枝花,617000;四川省攀钢钢铁研究院,攀枝花,617000;四川省攀钢钢铁研究院,攀枝花,617000 |
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| 基金项目： | 致谢：感谢电镜和金相检验的同志所做的检验工作. |
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| 摘 要： | 某异型钢轨在经60kg／m热轧钢轨加工至50kg／m过渡轨后出现矫直断裂。经对钢轨断口的宏、微观检验和分析，认为，断裂裂纹起源于轨腰次表层；钢轨发生矫直断裂的原因是在加工异型钢轨的过程中，加热温度偏高，导致轨腰表层部分区域出现沿晶氧化，锻压时因轨腰表层受拉应力作用，沿晶氧化处形成微裂纹，随后矫直时轨腰三点弯曲受力，微裂纹缺陷处产生应力集中致使裂纹扩展，导致钢轨断裂。
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| 关 键 词： | 钢轨 缺陷 断裂 |
| 文章编号： | 1001-4012（2006）09-0479-03 |
| 收稿时间： | 2005-07-13 |
| 修稿时间： | 2005-07-13 |
FRACTURE ANALYSE OF THE RAIL IN THE CORRECTION |
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| DENG Jian-hui,DENG Yong,WU Xiong-xian.FRACTURE ANALYSE OF THE RAIL IN THE CORRECTION[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2006,42(9):479-481. |
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| Authors: | DENG Jian-hui DENG Yong WU Xiong-xian |
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| Abstract: | In a factory, a fracture occurred in a transition rail of the 60kg/m to 50kg/m in the correction. Macro and microstructure inspections and compostion analysis of the fracture rail showed that surface layer of the rail waist there is primitive small cracks, it was grown by the 3-point curve correction lead to the rail fracture. The reason of the primitive small cracks is too high heating temperature and cause the serface layer of the rail waist result from grain bounderies oxidation, and by forging and pressing lead to crack in the position that was oxidized. |
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| Keywords: | Rail Defect Fracture |
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