利用光学显微镜和扫描电镜对材质为23MnNiCrMoA的链条断裂试样进行分析。结果表明,其产生断裂的微观原因是化学成分中铬元素含量偏低,影响了钢的淬透性和强度;钢中卷入了含有氧化镁,氧化硅,氧化铝,氧化钠和氧化钾成分的夹渣,加之此钢轧制过程中产生的划伤和折叠裂纹表面缺陷,使得链条在工作受力时裂纹更容易扩展,促使链条断裂。 The optical microscope and scanning electron microscope (SEM) were used to analyze the chain fracture samples of 23MnNiCrMoA. The results show that the microscopic reason for the fracture is that the chemical composition of the chromium content is low, affecting the hardenability and strength of steel; steel containing magnesium oxide, silicon oxide, aluminum oxide, sodium oxide and potassium oxide component Of the slag, combined with scratches and folding cracks generated during the steel rolling surface defects, making the chain more susceptible to crack in the work force expansion, prompting the chain fracture.