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探测和解剖分析了断面有中心裂纹缺陷的铸坯;用扫描电镜等分析了依照探伤图谱所选轧后钢板分层缺陷明显部位的金相组织、缺陷形态和微区成分;指出了其沿轧向分布的铁素体带及其内部的条状或片状硫化物是中厚板分层的主要成因;给出了铸坯内部轧制时焊合及修复的边界条件。
The castings with central crack defects were detected and analyzed. The microstructure, defect morphology and micro-zone composition of the obvious parts of delaminated steel sheets were analyzed by scanning electron microscope (SEM) The distribution of ferrite tape and its internal strip or flake sulfide is the main cause of plate delamination; the boundary conditions of internal rolling and repairing of the slab are given.