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某8Cr5MoV锻钢冷轧辊在使用时发生早期失效断裂,采用化学成分分析、金相检验、断口分析、硬度测试、冲击试验等方法对其断裂原因进行了分析,结果表明,未按要求对辊身进行热处理使辊身整个横截面在终淬(表面淬火)后几乎被淬透,其不符合心部为调质组织、边部有一定厚度隐针马氏体的淬硬层的要求。此外,辊身的心部和表面部分区域网状碳化物级别过高,导致了整个辊身的韧性恶化,造成轧辊的早期脆性断裂。
Some 8Cr5MoV forged steel cold roll in the use of early failure fracture occurred, the use of chemical composition analysis, metallographic examination, fracture analysis, hardness test, impact test methods such as its fracture analysis, the results show that not required on the roll body The heat treatment is carried out so that the entire cross-section of the barrel is almost hardened after the final quenching (surface hardening), which is not in conformity with the requirements of the hardened layer with a certain thickness of hidden martensite on the edge of the quenched and tempered tissue. In addition, the overgrowth of the network carbides at the core and part of the barrel leads to a deterioration of the toughness of the entire barrel, resulting in an early brittle fracture of the roll.