摘要
汽车发动机活塞进行台架耐久试验时发生断裂失效。通过宏观观察、断口形貌、化学成分、金相组织及硬度等测试方法分析了发动机活塞的断裂失效原因。结果表明:发动机活塞裂纹源区存在初晶硅偏聚现象,在周期性拉应力的作用下产生裂纹,最终导致发动机活塞发生断裂失效。
Fracture failure occurred during the bench durability test of the piston of the automobile engine.The fracture failure reasons of the piston were analyzed by macroscopic observation,fracture morphology,chemical composition,metallographic structure,and hardness testing methods.The results show that there is an accumulation of primary silicon in the crack source area of the engine piston.It would generate cracks under periodic tensile stress and ultimately lead to the fracture and failure of the engine piston.
作者
袁成逸
罗浩瑄
陈俐峰
李华鑫
冯文华
徐文雷
YUAN Chengyi;LUO Haoxuan;CHEN Lifeng;LI Huaxin;FENG Wenhua;XU Wenlei(Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo,Zhejiang,315336,China)
出处
《小型内燃机与车辆技术》
2025年第5期38-40,共3页
Small Internal Combustion Engine and Vehicle Technique
关键词
铝合金
活塞
初晶硅
断裂失效
Aluminum alloy
Piston
Primary silicon
Fracture failure
