压杆断裂原因分析

Failure analysis of a broken pressing pole

对失效压杆的化学成分、裂纹及断口特征、显微组织、硬度等进行了综合分析,结果表明其过早脆性断裂主要由钢中氧化物及硅化物夹杂所引起,原有的结构设计不当,加快了压杆的早期失效。更换脱氧、去硅更加彻底的合格钢材,同时将压杆杆部加工成直径均匀的光杆后,未发生压杆过早断裂失效。

A comprehensive analysis on chemical composition,fracture appearance,microstructure and hardness was carried out on a broken pressing pole.The results show that the existence of oxide and silicide particles is the main reason to result in the pressing pole broken,and its unsuitable structure design accelerates the early failure of the pressing pole.When adopting a qualified and good deoxygenated desiliconized steel,and a smooth pole with uniform diameter,the early failure of pressing poles has never occurred.