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对φ400×1200冷轧工作辊断辊事故通过现场调查及对断口、断辊的金相组织等进行测试分析,认为断辊是在轧制应力、淬火残余应力及中心孔壁刀痕应力集中的综合作用下,先在应力最严重而材料最薄弱处(孔壁表面氧化、脱碳、碳化物聚集分布处),产生微裂纹成为疲劳裂源,在轧制过程中裂纹逐渐扩展,最后导致轧辊断裂。文章提出了相应的改进措施。
Through the field investigation and the analysis of the microstructure of the fracture and the broken roller, it is concluded that the broken roller is stress-concentrated in the rolling stress, quenching residual stress and the center hole wall cutting stress Under the combined action, microcracks become the source of fatigue cracking when the stress is the most serious and the material is the weakest (oxidation, decarburization and carbide aggregation distribution on the surface of the pore wall), and the cracks gradually expand during the rolling process, fracture. The article puts forward the corresponding improvement measures.