Effect of hollow insulation riser on shrinkage porosity and solidification structure of ingot  

作　　者：Ying-jie Liu Chun-lin Peng Wan-ming Li Xiao-lei Zhu Ming-gang Shen Xiang-wei Liao Kun Liu Chong-yi Wei Yusuf Abba Yusuf Ji Yang Chang-you Cai 

机构地区：[1]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China [2]State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114000,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2022年第12期1951-1960,共10页

基　　金：The authors are grateful for the financial support from State Key Laboratory of Metal Material for Marine Equipment and Application(Grant No.SKLMEA-USTL-201705);the National Natural Science Foundation of China(Grant No.51974153).

摘　　要：The thermal insulation performance of riser is very important to the shrinkage porosity and solidification structure of ingot,but it is difficult to significantly improve due to the limit of thermal conductivity of riser material.A new type of hollow insulation riser was proposed based on the low thermal conductivity of air,which aims to improve the thermal insulation performance of riser.A 14.5-t steel ingot was prepared using the hollow insulation riser,and the casting temperature was 1500°C.The temperature evolution of the external surface of mold during solidification was measured using an infrared temperature instrument.A numerical model was established to simulate the porosity and solidification structure of ingot.The reliability of numerical simulation was verified by comparing simulation and experimental results.Results show that the insulation performance of the riser can be significantly improved through application of the hollow insulation sleeve.Compared with solid insulation sleeve,the shrinkage cavity depth was decreased and the position of porosity was raised when hollow insulation riser was applied.

关 键 词：Hollow insulation riser SOLIDIFICATION Heat transfer Porosity Thermal conductivity 

分 类 号：TG14[一般工业技术—材料科学与工程]