| 柴油机球铁曲轴断裂失效分析 |
| |
| 引用本文： | 于志伟,许晓磊,于善伟.柴油机球铁曲轴断裂失效分析[J].机械工程材料,2006,30(3):57-60. |
| |
| 作者姓名： | 于志伟 许晓磊 于善伟 |
| |
| 作者单位： | 1. 大连海事大学金属材料工艺研究所,辽宁,大连,116026
2. 大连产品质量监督检验所,辽宁,大连,116021 |
| |
| 摘 要： | 柴油机氮化球铁曲轴在服役过程中发生了断裂，断裂发生在第一曲拐与第二主轴颈之间的曲柄处。对其失效原因进行了分析，结果表明：裂纹起始于第一曲拐右下圆角根部，并在弯曲载荷作用下扩展，最终导致弯曲疲劳断裂；曲轴材料的基体组织、化学成分及力学性能均符合技术要求，渗氮层过浅是曲轴发生疲劳断裂的主要原因。
|
| 关 键 词： | 失效分析 曲轴 疲劳断裂 氮化 |
| 文章编号： | 1000-3738（2006）03-0057-04 |
| 收稿时间： | 2004-12-09 |
| 修稿时间： | 2004-12-092005-02-20 |
Failure Analyses of Ductile Cast Iron Crankshaft in a Diesel Engine |
| |
| YU Zhi-wei,XU Xiao-lei,YU Shan-wei.Failure Analyses of Ductile Cast Iron Crankshaft in a Diesel Engine[J].Materials For Mechanical Engineering,2006,30(3):57-60. |
| |
| Authors: | YU Zhi-wei XU Xiao-lei YU Shan-wei |
| |
| Affiliation: | 1. Dalian Maritime University, Dalian 116026, China; 2. Dalian Institute of Product Quality Supervision Inspection, Dalian 116021, China |
| |
| Abstract: | The failure analyses were conducted on a diesel engine crankshaft made of ductile cast iron, which was nitrided. The fracture occurred at the web between the 1st crankpin and 2nd journal. The fracture surface was observed in detail by visual and SEM. The bending fatigue fracture was the main failure mechanism of the crankshaft. The chemical composition, mechanical properties and microstructure of the crankshaft material were within the specified ranges. The over-shallow nitrided layer formed at the surface of the crankshaft should be responsible for the fracture of the crankshaft. |
| |
| Keywords: | failure analysis crankshaft fatigue fracture nitriding |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
