A numerical analysis of inverted V-segregation and its dependency on alloy properties

International Symposium on Liquid Metal Processing & Casting 2015

材料科学;金属工艺学

Sawada, T.^1 ; Suzuki, S.^1 ; Kajikawa, K.^1

Muroran Research Laboratory, Japan Steel Works, Ltd., 4 Chatsu-machi, Muroran

051-8505, Japan^1

关键词: Alloy properties;    Alloy system;    Cooling rates;    Critical value;    Density difference;    Solidification temperature;    Solidification velocity;    V segregations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/143/1/012030/pdf
DOI  :  10.1088/1757-899X/143/1/012030

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We ran a numerical simulation to investigate the effect of liquidus slope on the formation of inverted V-segregation in laterally solidified ingots of a virtual Fe-based binary- alloy system. The criterion used in this research is based on Suzuki's criterion. Our criterion assumed that inverted V-segregation zones form when the product of the solidification velocity and the cooling rate is below a critical value which depends on the alloy system. We studied the change in the critical value caused by the density and the liquidus slope of added element X. When different elements of varying densities were added, the results were in line with previous experimental results where large density difference causes increased formation of inverted V-segregation. Finally, the effect of the liquidus slope on the formation of the inverted V-segregation was studied. With a decrease in the liquidus slope, the critical value increased and inverted V-segregation tended to form. Furthermore, the streaks formed were more highly concentrated and sharper, and the channel population increased when the solidification temperature range was narrow.