【作者】 陈文旗； 胡树兵； 胡晨晨；

【Author】 CHEN Wen-qi,HU Shu-bing,HU Chen-chen (State Key Laboratory of Material Processing and Die and Mould Technology, Huazhong University of Science and Technology,Wuhan 430074,China)

【机构】 华中科技大学材料成形与模具技术国家重点实验室；

【摘要】 采用金相显微镜、扫描电子显微镜等检测工具,分析了某柴油机活塞产生裂纹的原因。分析结果表明:活塞表面的初晶硅在热循环的作用下开裂形成微裂纹,燃烧室边缘的高温降低了微裂纹扩展所需尺寸的门槛值,从而导致燃烧室边缘的微裂纹扩展形成宏观裂纹,活塞失效。更多还原

【Abstract】 To analyze the cause of cracks in a diesel engine piston,test tool such as optical microscope,scanning electron microscope were utilized.The results show that micro-cracks form on the surface of piston as a result of primary silicon phase cracking induced by thermal cycling.Elevated temperature at the rim of the combustion chamber would decrease threshold size for crack propagation,which would lead to micro-cracks propagation and macro-cracks initiation on the rim of the combustion chamber.更多还原