应用化学成分分析、金相检验和硬度测试等方法对断辊进行分析。结果表明,无限冷硬球墨铸铁轧辊中硅的含量超出标准范围是轧辊断裂的主要原因。加之工作层石墨球化不良、铁素体量较多、共晶莱氏体碳化物少且分布不均造成轧辊工作层承载能力不足最终导致轧辊断裂。

By means of chemical composition analysis,metallograph examination and hardness test,failure analysis of the roll was conducted. The result showed that,the main failure reason of roll was that the content of Si was too high. At the same time,abnormal nodulizing,increases with content of ferrite,decrease with content of ladeburite carbide or unevenly distributed in the microscopic structure of work layer,all these factors caused the roll fracture finally.