Research on carbon macro-segregation mechanism and secondary cooling control for bloom of GCr15 bearing steel
LIU Bo1，DOU Kun1，YANG Zhen-guo1,2，WANG Bao1，WANG Lei1，LIU Qing1
（1.State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China Special Steel Plants of Laiwu Iron and Steel Co.，Ltd.，Laiwu 271104，Shandong，China）
Abstract：A coupling model of heat transfer and microstructure for GCr15 bearing steel from a domestic steel plant is established to study the influence mechanism of different secondary cooling patterns on the variation of characteristic parameters (secondary dendrite arming spacing, equiaxed crystal ratio). On this basis, the influence of microstructure evolution on carbon macro-segregation is researched via plant trials and numerical simulation. Based on above results, the relationship of secondary cooling pattern, characteristic parameters for solidification structure as well as carbon macro-segregation is revealed from the “macro-micro” perspective thus alleviating the carbon macro-segregation degree for GCr15 bearing steel by obtaining reasonable secondary cooling control pattern.
刘 博，窦 坤，杨振国 ，王 宝，王 雷，刘 青. GCr15轴承钢大方坯宏观碳偏析形成机理及二次冷却调控机制研究[J]. 中国钢铁期刊网, 2015, 34(5): 7-14.
LIU Bo，DOU Kun，YANG Zhen-guo，WANG Bao，WANG Lei，LIU Qing. Research on carbon macro-segregation mechanism and secondary cooling control for bloom of GCr15 bearing steel. Chinese Journal of Iron and Steel, 2015, 34(5): 7-14.
2015, Vol. 34 
