镍基高温合金定向凝固过程中雀斑缺陷研究进展  

Review of Freckle Defects under Directional Solidification of Nickel-based Superalloys

作　　者：高斯峰[1] 刘林[1] 胡小武[1] 葛丙明[1] 张军[1] 傅恒志[1] 

机构地区：[1]凝固技术国家重点实验室,西北工业大学,陕西西安710072

出　　处：《材料科学与工程学报》2010年第1期145-151,共7页Journal of Materials Science and Engineering

基　　金：国家重点基础研究发展计划资助项目(2006CB605202);国家自然科学基金资助项目(50771081,50827102)

摘　　要：本文简述了近年来定向和单晶镍基高温合金凝固过程中雀斑缺陷的研究进展,具体论述了雀斑缺陷的形成机制以及雀斑的预判模型,并从合金成分、凝固参数(抽拉速率和温度梯度)、凝固界面形态以及试样形状和尺寸等方面分析和论述了这些因素对雀斑缺陷形成的影响,最后对未来镍基高温合金中雀斑缺陷的研究方向进行了探讨和展望。The research status of the freckles,a kind of common defects in directionally solidified and single crystal nickel-based superalloys,is reviewed in this paper.The formation mechanisms of freckle defects and the models that are applied to predict the formation of freckles are presented.The influences of alloy composition,solidification parameters（withdrawal velocity and temperature gradient）,the morphology of solidification interface,the shape and size of samples on the formation of freckles are analyzed and discussed.Finally,the tendency and prospect of the freckle defects of nickel-based superalloys are pointed out.

关 键 词：镍基高温合金 雀斑 定向凝固 

分 类 号：TB35[一般工业技术—材料科学与工程] TG132.32[金属学及工艺—合金]