100t汽车车轴断裂分析

奔车族

摘要：采用直读光谱、力学性能测试、金相检验和扫描电镜观察等方法对重型载重汽车的断裂
车轴进行了分析。结果表明，车轴材质为40Cr钢，未经调质处理，加上车轴表层严重脱碳，导致其
力学性能均低于标准值；加之轴表面存在划痕，在表面淬火后形成淬火裂纹，在使用过程中发生脆
性解理断裂。
关键词：失效分析；车轴断裂；40Cr钢
中图分类号：TH133．2 文献标识码：A 文章编号：1001—4012(2006)09—0473—03
FAILURE ANALYSIS OF 100t HEAVY AUTOMOBILE AXLE
FU Jin-ming，ZHAO Han，W ENG Shao-hua
(Jiangyin Xingcheng Steel Works，Jiangyin 214400，China)
Abstract．A failure analysis of a fracture axle fixed on a carrying-hot iron truck was conducted by means of
chemical composition analysis of emission spectrometer，mechanical property testing， metallographic and SEM
examinatioru There is the origin of fracture on the inj ure SHrface of decarbonizatiorL The axle。which is made of
40Cr steel bar，had been special treated by high frequency current quenching on the surface，but no temper treating
of whole axle．The fracture is brittleness cleavage one because that mechanical property of axle is disqual|fication and
quenching crack presence on the surface by the surface treatment．
Keywords：Failure analysis；Fracture of axle；40Cr st
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