摘要
用于重型车辆减震系统的蝶形弹簧在生产制造阶段测力试验环节中发生断裂。对断裂碟簧和母材原材料进行化学成分、非金属夹杂物、晶粒度、石墨碳、表面脱碳层检测,对裂纹微观形态进行光学显微观察,对断口SEM形貌及能谱成分进行分析。根据观察和检测结果,确定碟簧磷化处理时发生应力腐蚀开裂是导致测力试验沿着已有的微裂纹迅速断裂的直接原因,并对应力腐蚀裂纹生成机理和形成条件进行阐述与分析,指出碟簧硅元素偏低、磷含量和钢中非金属夹杂物超标是促进和加速应力腐蚀裂纹萌生的原因。提出严格选用合格的原材料、调整磷化液成分、适当降低酸度值等改进措施。
The butterfly spring,used in the damping system of heavy vehicle,fractured during the dynamometry experimentation of production-manufacturing stage.The chemical constitution,non-metallic inclusion,grain size,graphitic carbon,surface decarburized layer of the fractured butterfly spring and raw materials were detected.The micro morphology of crack was observed by optical microscopy,and analyzed by SEM.According to the result of observation and detection,it is found that during phosphating,stress corrosion cracking directly leads to fracture of butterfly spring in dynamometry experimentation.The formation mechanism and condition of stress corrosion crack were analyzed.The results show that the reason of accelerating the initiation of stress corrosion crack is low silicon content in butterfly spring constituent,the over standard phosphorus content and non-metallic inclusion in steel.Finally,it brings forward the improvement measures,such as strictly choosing the qualified raw materials,adjusting the component of phosphate solution and properly reducing acidity value and so on.
出处
《兵器材料科学与工程》
CAS
CSCD
2010年第3期79-82,共4页
Ordnance Material Science and Engineering
关键词
蝶形弹簧
应力腐蚀
磷化
洁净度
butterfly spring
stress corrosion
phosphating
cleanliness
