| 船用主柴油机失效排气门检测与分析 |
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| 引用本文： | 余宪海,杨世柏.船用主柴油机失效排气门检测与分析[J].广州航海高等专科学校学报,2006,14(1):4-8. |
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| 作者姓名： | 余宪海 杨世柏 |
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| 作者单位： | 广州航海高等专科学校,轮机系,广东,广州,510725;武汉理工大学,材料学院,湖北,武汉,430063 |
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| 摘 要： | 观察了某远洋轮主柴油机失效排气门的显微组织和裂纹形态,检测了气门材料和腐蚀产物的成分,认为燃烧产物中的硫和钒的氧化物对气门密封面的腐蚀,是导致该气门产生裂纹的主要原因;高温燃气冲刷及冲击负荷的作用,加速了该气门的失效,其过程是由沿晶界龟裂,然后以此为裂源而引起的疲劳扩展.
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| 关 键 词： | 失效 排气门 高温 腐蚀 晶界龟裂 |
| 文章编号： | 1009-8526(2006)02-0004-05 |
| 收稿时间： | 02 23 2006 12:00AM |
| 修稿时间： | 2006年2月23日 |
FAILURE ANALYSIS ON THE EXHAUST VALVE OF SHIP DIESEL ENGINE |
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| YU Xian-hai,YANG Shi-bo.FAILURE ANALYSIS ON THE EXHAUST VALVE OF SHIP DIESEL ENGINE[J].Journal of Guangzhou Maritime College,2006,14(1):4-8. |
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| Authors: | YU Xian-hai YANG Shi-bo |
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| Institution: | 1.Marine Engineer Department of Guangzhou Maritime College, Guangzhou510725, China ;2. College of Material Science and Engineering , Wuhan University of Technology,Wuhan430063, China |
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| Abstract: | The microstructure and crack forms of the exhaust valve of the diesel engine were observed,and thechemical compositions of the valve material and corrosive matter in the cracks were examined.It is pointed out thatcorrosion action of S and Voxidation on the seal surface of the exhaust valve was main reason that resulted in crackin exhaust valve.And the brush of high temperature gas and impact load speeded failure.The cracks on valve sur-face are primarily emerged due to inter crystalline chap,then fatigue propagation resultthese cracks which appear asfatigue origins. |
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| Keywords: | failure high temperature exhaust valve corrosion inter crystalline chap |
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