Melting and floating processes of inorganic materials in molten steel:Visualization physical simulation and mathematical modelling  

作　　者：Jin-hu Lai Sheng Yu Yang-jian Xu Dan-qing Jiang San-san Shuai Jiang Wang Zhong-ming Ren 

机构地区：[1]State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [2]Shaoxing Institute of Technology,Shanghai University,Shaoxing 312000,Zhejiang,China

出　　处：《China Foundry》2023年第2期89-98,共10页中国铸造（英文版）

基　　金：supported by Shanghai Post-doctoral Excellence Program of China(No.2021166);Shanghai Rising-Star Program(Nos.20QA1403800 and 21QC1401500);Shanghai Science and Technology Committee(No.21511103600).

摘　　要：It has been demonstrated that heat absorption method by using the inorganic material rod to cool the molten steel can significantly reduce the macrosegregation level of the large steel ingot.However,owing to the opacity of the molten steel,the physical mechanism of the heat absorption method is not clear.In this work,a transparent hydraulic physical model with water and paraffin wax was built to simulate the melting and floating processes of inorganic materials in the molten steel.A mathematical simulation was also carried out to analyze the connection between the actual ingot and the physical model.Results show that it is feasible to simulate the molten steel and inorganic materials with water and paraffin wax.With the help of the physical model,the process of the melting of paraffin wax and its floating to the surface of water were clearly observed,during which the temperature of water at some characteristic positions in the mold was recorded.The visualization findings demonstrate that the melting and floating processes of paraffin wax can help to bring the heat from the center of the mold to the top surface more quickly,which reduces the superheat and significantly accelerates the cooling rate of water.The experimental results show that for the water with a certain superheat,the use of a larger mass of paraffin wax can accelerate the cooling of the water,but there is a risk of incomplete melting of the paraffin wax.A higher superheat of water will lead to a quicker melting rate for a given mass of paraffin wax,while a lower superheat leads to the incomplete melting of paraffin wax as well.

关 键 词：water and paraffin wax heat absorption method physical simulation SUPERHEAT large steel ingot 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]