采用高倍金相检验、扫描电镜及能谱分析等方法对120mm Q390GJC-Z35特厚板的z向性能不合缺陷进行了研究。结果表明：z向性能不合主要是由于钢锭存在着较严重的中心偏析,在不合试样断口处存在着较多的块状（Nb、Ti）C聚集,块状的（Nb、Ti）C成为裂纹源。此外,偏析处还存在贝氏体等硬相组织,更加剧了断裂扩展,导致z向性能不合。通过优化成分设计,加强精炼过程控制,改进模铸浇注工艺,制定合理热处理工艺等相关措施,取得了良好的效果。
By SEM, metallographic examination and EDS, the reason for the disqualified z-direction property of 120 mm Q390GJC-Z35 steel was investigated. The results show that the disqualified z-direction property of Q390GJC-Z35 is due to the severe center segregation in the ingot and the aggregation of bulk Nb（Ti）C at the fracture at the disqualified test pieces. Bulk Nb（Ti）C become the crack origin and hard phases such as bainite appeared at the segregation, which aggravate the fracture propagation and resulted in the disqualified z-direction property. By optimizing the composition design, controlling the refining process, improving the mould casting process and setting ap- propriate heat treatment process, good results can be obtain.
参考文献
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