采用金相、能谱、X射线衍射等分析方法对MnNiCu合金板材在冷轧过程中表面的龟裂原因进行分析。结果表明，龟裂是由于浇铸铸坯时产生了严重的枝晶偏析，富锰区和富铜区相互交替，经过热轧后形成沿板厚方向成层状分布的周期波动，在冷轧时发生龟裂。由于成分不均匀导致力学性能不均匀，在冷轧过程中各层之间的金属流动不能协调时，导致发生了龟裂。
The cracking analysis of MnNiCu plate in cold rolling process was conducted by analyzing the microstructures, EDS and XRD. The results showed that macrosegregation generated in casting process, Mnrich zone and Curich zone were in alternative pattern and periodic fluctuation of layer distribution along plate thickness was formed after hot rolling, then cracking occurred after cold rolling.
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