Application of heat absorption method to reduce macrosegregation during solidification of bearing steel ingot  

作　　者：Sheng Yu Long-qiang Zhu Jin-hu Lai Ming-xu Pan Yue-yun Liu Wei-dong Xuan Jiang Wang Chuan-jun Li Zhong-ming Ren 

机构地区：[1]State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [2]Daye Special Steel Co.,Ltd.,Huangshi 435001,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2022年第12期1915-1926,共12页

基　　金：This work was supported by National Key R&D Program of China(Grant No.2019YFA0705303);National Natural Science Foundation of China(Grant No.52127807);National Science and Technology Major Project"Aeroengine and Gas Turbine"(Grant No.2017-VII-0008-0102);Independent Research and Development Project of State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University(SKLASS 2020-Z05);the Science and Technology Commission of Shanghai Municipality(No.19DZ2270200).

摘　　要：The control of macrosegregation is still a difficult problem for the production of large steel ingots.In order to develop new techniques for producing low-macrosegregation and high-quality steel ingots,the effect of the heat absorption method(HAM)used by the inorganic material rods to cool the liquid steel on the formation of macrosegregation during solidification of a 5-t GCr15SiMn bearing steel ingot was studied using experiment and mathematical simulation.The inorganic material was a mixture of CaF2 and CaO.The levels of macrosegregation in the longitudinal sections of two ingots with and without HAM were compared.Experimental results showed that the application of HAM reduced the positive segregation in the upper part of the ingot and the negative segregation in the lower part.The levels of carbon segregation along the longitudinal centerline and horizontal direction at different heights were all alleviated and the fluctuation of carbon segregation was significantly reduced.The simulation results confirmed that the melting and floating of the inorganic material could carry the sensible heat to the top of the liquid steel quickly.This leads to the acceleration of the cooling rate of the liquid steel,thereby alleviating the level of macrosegregation.

关 键 词：Large steel ingot MACROSEGREGATION Inorganic material Heat absorption method Mathematical simulation 

分 类 号：TG142[一般工业技术—材料科学与工程]