Modes of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys  

作　　者：Xiangbin Meng Qi Lu Jinguo Li Tao Jin Xiaofeng Sun Jun Zhang ZhongqiangChen Yanhui Wang Zhuangqi Hu 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]Graduate School of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China [4]Aviation Industry Corporation of China(AVIC)Shenyang Liming Aero-engine(Group)Corporation LTD.,Shenyang 110043,China

出　　处：《Journal of Materials Science & Technology》2012年第3期214-220,共7页材料科学技术（英文版）

基　　金：supported by the National Basic Research Program(973 Program) of China under Grant No.2010CB631200(2010CB631206);the National Natural Science Foundation of China(NSFC) under Grant No.50801061,No.50931004,No.51071165;the fund of the State Key Laboratory of Solidification Processing in NWPU under Grant No.SKLSP201112

摘　　要：The modes of grain selection in spiral selector were investigated by both a ProCAST simulation and experimental confirmation.The results show that the efficiency of grain selection in starter block is associated with the geometry shape.At the early stage of grain selection,the optimization of grain orientation is dominated by competitive grain growth,but the optimization of grain orientation in starter block is gradually dominated by geometry shape at the later stage of grain selection.Besides,the spiral part could also optimize the orientation of the selected single crystal when the initial angle is large enough,and the single crystal selection in spiral parts with different pitch lengths and initial angles is dominated by different modes.The simulation results agree well with experimental ones.

关 键 词：Ni-base single crystal superalloys Competitive grain growth Geometry shape Directional solidification Spiral selector 

分 类 号：TG146.15[一般工业技术—材料科学与工程] F326.11[金属学及工艺—金属材料]