重载车轮辋崩断原因分析  

The Analysis of Wheel Rim Breakdown of Heavy-duty Truck

作　　者：陈雪艳[1] 张彦文[1] 孙宜强[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《武汉工程职业技术学院学报》2013年第1期29-32,共4页Journal of Wuhan Engineering Institute

摘　　要：对重载车轮辋崩断后的断面进行了宏观观察,用扫描电镜和光学金相显微镜对轮辋组织结构进行了解剖分析。结果表明,轮辋的断裂属多源疲劳断裂,轮辐与轮辋的内外侧焊缝中均存在气孔、疏松、偏焊、熔合线裂纹等缺陷,在轮辋结构张应力集中处产生疲劳源,它在车轮运转过程中不断扩展,最终导致轮辋崩断。The macro observation of the wheel rim breakdown section of heavy-duty truck is made. The analysis of structure of rim is conducted by the optic microscope and scanning electric microscope. The findings indicate that the wheel rim breakage is caused by multi-source fatigue failure and some air cavities, rarefaction, bias welding, and weld junction craze, etc. which giving rise to fatigue source at centralized points of rim tension and stress and is expanding while wheel is in motion, leading to rim breakdown.

关 键 词：多源疲劳断裂 疏松缺陷 

分 类 号：TG115[金属学及工艺—物理冶金]