车轮轮缘块状剥落原因分析  

Cause analysis on block peeling from flange of wheel

作　　者：汪瑞俊 WANG Ruijun(Chizhou Institute of Quality Inspection and Research,Chizhou 247000,China)

机构地区：[1]池州市质量监督检验研究院,安徽池州247000

出　　处：《物理测试》2023年第3期21-27,共7页Physics Examination and Testing

摘　　要：某地铁用车轮在运行一段时间后车轮的轮缘部位出现块状剥落现象。为查明车轮轮缘块状剥落原因,采用化学成分分析、力学分析、断口观察、金相组织分析等方法进行了检验分析。结果表明,车轮轮缘部位块状剥落特征为多源高应力疲劳断裂引起的剥落,车轮轮缘浅表层的高硬度白层马氏体组织和深度达7 mm的表层复合组织是导致轮缘发生块状剥落的主要原因,表层较深的复合组织应是淬火工艺不当造成的,建议对车轮的轮缘部位制定合理的淬火工艺以避免缺陷组织的产生。The block peeling from the flange of rear wheel occurred when the subway wheel was used for a period of time.In order to find out the cause,some methods including chemical composition inspection,mechanical analysis,macroscopic observation of fracture and metallographic structure analysis were employed.The results showed that the block peeling from the flange of wheel was the typical characteristic of peeling caused by multisource high stress fatigue fracture.High hardness white layer martensite and the composite structure with depth up to 7 mm were the main reasons for block peeling from the flange.The composite structure on deep surface should be caused by the unreasonable quenching process.It was suggested to develop the reasonable quenching process for the flange of wheel to avoid formation of defect structures.

关 键 词：车轮轮缘 高应力疲劳断裂 白层马氏体组织 复合组织 

分 类 号：U279[机械工程—车辆工程]