材料工程2016，Vol.44Issue(11)：1-8,8.DOI:10.11868/j.issn.1001-4381.2016.11.001
单晶铸件凝固过程工艺优化的数值模拟
Numerical Simulation on Parameters Optimization of Single Crystal Castings Solidification Process
摘要
Abstract
A new method is proposed to evaluate the process parameters by the solid‐liquid interface position ,thermal gradient angle and the axial thermal gradient .The effects of the process parameters on the solid‐liquid interface position ,thermal gradient angle and the axial thermal gradient were simu‐lated by ProCAST using LMC(Liquid Metal Cooling ) and HRS(High Rate Solidification) processes . The results show that HRS process is little affected by the mold thickness ,the dominant heat transfer factor in HRS is radiation from the mold surface ,and the dominant heat transfer factor in LMC either mold thermal conductivity or mold‐metal interface heat transfer ;increasing furnace temperature is beneficial to increase the axial thermal gradient ;the withdrawal rate is the most important process pa‐rameter which significantly affects the thermal field during solidification ,as the withdrawal rate in‐creases ,the axial thermal gradient first increases and then decreases ,therefore ,it is necessary to ap‐ply different withdrawal rates for different alloys .After holding 10min at different pouring tempera‐tures ,a uniform temperature is achieved ,and it has slight influence on the subsequent solidification . It has been put forward that the solid‐liquid interface position ,thermal gradient angle and the axial thermal gradient can be utilized as a serial of efficient analysis standards for optimization of process conditions independent of casting geometry .关键词
定向凝固/工艺优化/数值模拟Key words
directional solidification/parameters optimization/numerical simulation分类
矿业与冶金引用本文复制引用
卢玉章,申健,郑伟,徐正国,张功,谢光..单晶铸件凝固过程工艺优化的数值模拟[J].材料工程,2016,44(11):1-8,8.基金项目
国家高技术研究发展计划项目资助（2012AA03A511，2012AA03A513）；国家重点基础研究发展计划项目资助 （）
