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对某水平连铸用ＣｕＣｏ２Ｂｅ合金结晶器内套的断裂失效进行了化学成分、硬度、金相组织、扫描电镜和俄歇能谱等分析测试。结果表明，造成ＣｕＣｏ２Ｂｅ合金内套早期失效的原因是沿晶界分布的共晶体，在高温连续作业中，受高温铸流的摩擦和氧化而形成裂纹源。在热应力作用下扩展，最终导致沿晶脆断。据此提出了预防沿晶断裂和改善质量的措施和建议。
The chemical composition, hardness, microstructure, scanning electron microscopy and Auger energy spectrum of the CuCo2Be alloy mold inner sleeve were analyzed for the fracture failure of a horizontal continuous casting. The results show that the cause of the early failure of CuCo2Be alloy inner sleeve is the eutectic distributed along the grain boundary. At high temperature continuous operation, it is subject to friction and oxidation by high temperature casting flow to form the crack source. Extended under thermal stress, eventually leading to brittle fracture along the crystal. Accordingly, measures and suggestions for preventing intergranular fracture and improving quality are put forward.