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ANLALYSIS ON
REASON OF EARLY FATIGUE
FAILURE IN
BACK WHEEL HUB AXLE OF CAR
Liu Ximing 1 Zhang
Qingmao 2 Zheng Chengju 1 Zhang Jiyuan
1
(1. Graduate School of Material
Surface Engineering, Changchun University of Technology,Changchun
130012;
2. School of Information and
Photoelectron Science Engineering, South China Normal University,
Guangzhou 510631)
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Abstract: Analysis
on defect and the work of contrast about microstructure and fatigue life
are carried out at same time between the materials of home and Germen
back wheel hub axle. On base of the above, the reason of early fatigue
inactivation occured in home back wheel hub axle are founded. The test
results show that mass of metallurgical defect exist in the material and
a great amount of Mo, Cr, Ca, Cl, O, Na, K are founded in the zone of
rarefaction cavity defect, but there is no element Mo in the substrate.
This proves that the substrate isn’t alloyed. The occurrence of cavity
is the real reason about over early generation of fatigue crack. The
test results may be treated as the theoretical rule about material
choosing for back wheel hub axle of home car.
Key words:Wheel
hub axle Early fatigue Fatigue life
CLC No: TG172.9
吉林省杰出青年基金(20030128)和吉林省工业引导(20030331)资助项目.
Received 20050612, received in revised form 20060202
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