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采用宏观及微观断口分析、金相检测、升温脱氢分析试验和电化学充氢模拟试验等方法,对弹簧扁钢60Si2Mn端部裂纹的形成机制进行了研究。结果表明:弹簧扁钢60Si2Mn裂纹附近的显微组织没有明显的差异,电化学充氢前后的断口形貌均表现出解理、准解理的特征;未完全扩散出去的氢原子在缺陷区聚集导致材料内部的氢浓度偏高,这是引起弹簧扁钢60Si2Mn在剪切后的堆垛储存中,诱发端部剪切裂纹的主要原因。建议生产过程中,对剪切后的弹簧扁钢60Si2Mn进行缓冷处理,从而为钢材中氢原子的释放提供有利的条件,避免裂纹的产生。
The formation mechanism of the 60Si2Mn end crack in the spring flat bar was studied by macroscopic and microscopic fracture analysis, metallographic examination, thermal dehydrogenation analysis and electrochemical hydrogen simulation. The results show that there is no obvious difference in the microstructure near the 60Si2Mn crack of the spring flat steel. The fracture morphology before and after the electrochemical hydrogen charging shows the characteristics of cleavage and quasi-cleavage. The hydrogen atoms that have not completely diffused out gather in the defect area Resulting in a high concentration of hydrogen inside the material, which is the main cause of the shear-induced end-shear cracks in the spring-loaded flat steel 60Si2Mn after shearing. The proposed production process, the spring steel flat after the cut 60Si2Mn slow cooling treatment, thereby releasing the hydrogen atoms in the steel to provide favorable conditions to avoid the generation of cracks.