摘要
采用SEM和光学显微镜观察稳定杆的显微组织,用DV-2型直读光谱仪对其材料的成分进行了分析,确定稳定杆断裂为疲劳断裂,认为稳定杆早期断裂原因是由于制造工艺和热处理工艺不当所致。由于稳定杆在表面产生了柱状晶及晶粒间微裂纹,内部出现不均匀组织增加了内应力,以及成型半径过小、表面粗糙度大、氧化皮的存在等引起应力集中,在扭转、挤压和剪切力的作用下萌生了裂纹源,而裂纹扩展造成稳定杆早期断裂。
Microstructure was observed by SEM and optical microscopy, composition of material was determined by a DV-2 type direct-reading spectrometer. The breaking of automobile stabilizing rod was considered as fatigue fracture, which was caused by improper manufacturing process and heat-treating process. Columnar grains were shown in skin layer and micro-cracks were developed among grains, internal stress was increased by the heterogeneous structure, stress concentration was promoted by a lesser forming radius, biggish surface roughness and oxidation scale. When the function of torsion, extrusion and shearing was conducted on the automobile stabilizing rod, crack initiated and propagated to cause the breaking.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2006年第6期61-63,共3页
Ordnance Material Science and Engineering
