Influence of Casting Parameters on the Shrinkage Porosity of a 40 Ton Steel Ingot by Numerical Simulation

摘要：

　　The improvement of metal yield and high efficiency utilization of resources during foundry practice are significant for energy conservation and environment protection.In order to explore technique methods for decreasing the depth of shrinkage cavity of an ingot and improving the metal yield,a three-dimensional numerical model of the filling and solidification of a 40 ton steel ingot was developed.And the model was validated by the method of the infrared temperature surveying.Based on this,the influences of height-to-diameter ratio (H/D),taper,the height of insulation,pouring temperature and pouring rate on the depth of shrinkage cavity and the denseness in structure were investigated.In order to evaluate the effect of these casting parameters on the depth of shrinkage cavity correctly,a dimensionless factor was put forward which took account of the absolute difference of the maximum and minimum values of each parameter allowed in industrial process according to the experience in the ingot production,the difference of the two values used in the simulation of each parameter,the difference of the depth of shrinkage cavities calculated under the smaller and larger values of each parameter respectively and the average height of the insulation.According to this dimensionless factor,conclusions were drawn that H/D has the most obvious influences on the depth of shrinkage cavity,followed by pouring rate and the height of insulation.While,taper and pouring temperature almost have no influences on the depth of shrinkage cavity.Similarly,another dimensionless factor which was used to evaluate the effect of these casting parameters on the denseness in ingot structure was put forward.And results showed that taper,pouring temperature,H/D and pouring rate all have influences on the denseness in structure of the ingot to a certain degree,among which,taper is the most significant.In addition,the height of insulation almost has no influences on the denseness in structure.

关键词： ingot solidification shrinkage porosity numerical simulation casting parameter

作者: Chaojie ZHANG Yanping BAO Min WANG Baoqi GUO

作者单位: State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China

会议类型: 国际会议

会议名称: the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)

会议地点: 北京

会议语种:英文

页码: 543-546

在线出版日期: 2015-05-12（万方平台首次上网日期，不代表论文的发表时间）