北京科技大学学报2012，Vol.34Issue(8)：892-897,6.
49MnVS3非调质钢连铸方坯中心裂纹分析
Analysis on central cracks in a continuous casting bloom of non-quenched and tempered steel 49MnVS3
摘要
Abstract
Macro- and micro-characteristics at the center of a continuous casting bloom of non-quenched and tempered steel 49MnVS3 were investigated by optical microscopy, scanning electron microscopy and energy dispersive spectrometry. It is found that serious segregation induces a central crack. The crack occurs at the end of columnar grains and the zone of coarse equiaxed grains, and propagates along the boundaries of primary dendrites. The clacking mode is intergranular cracking, which happens in the liquid phase. There are two kinds of grain boundary segregations, one is the precipitation of MnS inclusions, and the other is the concentration of liquid steel. The precipitated inclusions at the central position do not meet the requirements of the non-quenched and tempered steel.关键词
非调质钢/连铸/方坯/裂纹/枝晶/偏析Key words
non-quenched and tempered steel/continuous casting/blooms/cracks/dendrites/segregation分类
冶金工业引用本文复制引用
苑阳阳,张炯明,肖超,胡招凡,陈少东..49MnVS3非调质钢连铸方坯中心裂纹分析[J].北京科技大学学报,2012,34(8):892-897,6.基金项目
国家自然科学资助项目 （）
