VAR过程中Ti-1023合金凝固组织和偏析行为的研究  

Solidification Structure and Segregation Behavior of Ti-1023 Alloy during VAR Process

作　　者：杨治军[1] 常辉[1] 寇宏超[1] 赵小花[1] 胡锐[1] 李金山[1] 周廉[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室

出　　处：《特种铸造及有色合金》2010年第12期1079-1082,共4页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB613802)

摘　　要：采用SEM、XRD及化学成分分析等方法,分析了真空自耗电弧熔炼(VAR)过程中Ti-1023铸锭的凝固组织及相组成,研究了搅拌磁场对铸锭宏微观偏析行为的影响。结果表明,等轴晶区主要为针状和片层状的α相结构,而柱状晶区中等轴颗粒状的α相结构较多;在铸锭柱状晶和等轴晶内,Fe含量沿晶粒生长方向逐渐增加,且等轴晶内Fe的偏析程度要大于柱状晶内的;施加搅拌磁场后,Fe在柱状晶和等轴晶内的偏析程度都有所减小,同时Fe在Ti-1023铸锭中的宏观偏析程度降低,这对该合金中β斑的形成具有重要的影响。Influence of magnetic stirring on the solidification structure and segregation behavior of Ti-1023 alloy during VAR steady state melting process was analyzed by SEM (scanning electron microscope), XRD (X-ray diffraction) and chemical composition analysis. The results reveal that equiaxed grain zone mainly contains acicular and lamellar α structure, while columnar grain zone is mainly composed of equiaxed grain α structure. Fe element content is gradually increased in both equiaxed and columnar grains along the grain growth direction, and the segregation rate of Fe element is more serious in equiaxed grain than that in columnar grain. The segregation rate of Fe element is decreased in both equiaxed and columnar grains with magnetic stirring, and macro-segregation of Fe element in the ingot is decreased, which is closely related to the formation of β phase in the alloy.

关 键 词：VAR TI-1023合金 偏析行为 搅拌磁场 凝固组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]