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对轴套断口进行化学成分分析、显微组织、断口分析、硬度测试。结果表明,断口存在非金属夹杂,显微组织中存在大量的粒状、网状碳化物,淬硬层偏深,形成马氏体组织应力大,在辊套工作受力时,在非金属夹杂处产生裂纹,裂纹沿晶界快速扩展,导致辊套断裂。
The sleeve fracture chemical composition analysis, microstructure, fracture analysis, hardness test. The results show that there are non-metallic inclusions in the fracture, a large number of granular and reticular carbides exist in the microstructure, the hardened layer is deep and the stress in the formation of martensite is large. When the work is under stress, Cracks, cracks along the grain boundary rapid expansion, resulting in roll sleeve fracture.