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某公司采购的莱钢S50CM链条钢在生产过程中出现的断裂现象,通过对断裂链片进行化学成分分析、洛氏硬度检验,以及对链片断口进行金相分析、扫描电镜分析,判断S50CM链条钢断裂原因。分析结果表明,链片断口为典型的脆性断口,由于在回火过程中加热温度或加热时间不当,导致杂质元素在晶界偏聚,形成回火脆性,从而发生断裂。
A company purchased the S50CM chain steel Laiwu Steel in the production of the phenomenon of fracture, through the analysis of the chemical composition of the fracture link, Rockwell hardness test, as well as the fracture of the chain segment metallographic analysis, scanning electron microscopy to determine the S50CM chain Causes of steel fracture. The results show that the fracture of the chain piece is a typical brittle fracture. Due to the improper heating temperature or heating time during the tempering process, the impurity elements are segregated at the grain boundary to form temper brittleness and fracture.