| 烟气轮机转子叶片失效分析 |
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| 引用本文： | 贾建伟,董建新,张麦仓.烟气轮机转子叶片失效分析[J].失效分析与预防,2007,2(2):24-28. |
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| 作者姓名： | 贾建伟 董建新 张麦仓 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083 |
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| 摘 要： | 本文通过金相、化学分析以及扫描电镜和能谱仪等分析手段,对激光修复后失效的某烟气轮机转子叶片进行化学成分分析、断口宏微观形貌以及金相组织观察,综合分析了叶片断裂失效原因.结果表明,叶片断裂主要起源于熔覆层中的缺陷和微裂纹;叶片存在明显的晶界宽化,在晶界形成连续的碳化物薄膜,降低了叶片硬度和冲击韧性,是叶片发生沿晶断裂的主要原因.
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| 关 键 词： | 烟气轮机 叶片 熔覆层缺陷 沿晶断裂 |
| 文章编号： | 1673-6214（2007）02-0024-05 |
| 修稿时间： | 2007-02-012007-02-27 |
Failure Analysis of a Flue Gas Turbine Blade |
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| JIA Jian-wei,DONG Jian-xin,ZHANG Mai-cang.Failure Analysis of a Flue Gas Turbine Blade[J].Failure Analysis and Prevention,2007,2(2):24-28. |
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| Authors: | JIA Jian-wei DONG Jian-xin ZHANG Mai-cang |
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| Affiliation: | Beijing University of Science and Technology, Beijing 100083, China |
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| Abstract: | The chemical composition, hardness, impact toughness, macro and micro appearance of a fractured blade repaired by laser cladding were investigated in order to find out the cause of fracture. It is concluded that the intergranular cracks due to the cladding repairing is the main reason of initiation of the fracture. The strengthening phases of blade did not coarsen and remeh. While broadening and continuous carbide film in the grain boundary, which decreases the hardness and impact toughness of the blade, are the main cause of the intergranular fracture of the blade. |
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| Keywords: | flue gas turbine blade defects in cladding layer intergranular fracture |
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