船用主柴油机失效排气门检测与分析  

FAILURE ANALYSIS ON THE EXHAUST VALVE OF SHIP DIESEL ENGINE

作　　者：余宪海[1] 杨世柏[2] 

机构地区：[1]广州航海高等专科学校轮机系,广东广州510725 [2]武汉理工大学材料学院,湖北武汉430063

出　　处：《广州航海高等专科学校学报》2006年第1期4-8,共5页Journal of Guangzhou Maritime College

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.The microstructure and crack forms of the exhaust valve of the diesel engine were observed, and the chemical compositions of the valve material and corrosive matter in the cracks were examined. It is pointed out that corrosion action of S and V oxidation on the seal surface of the exhaust valve was main reason that resulted in crack in exhaust valve. And the brush of high temperature gas and impact load speeded failure. The cracks on valve surface are primarily emerged due to inter crystalline chap, then fatigue propagation result these cracks which appear as fatigue origins.

关 键 词：失效 排气门 高温 腐蚀 晶界龟裂 

分 类 号：U672[交通运输工程—船舶及航道工程]