Effect of solidification rate on MC-type carbide morphology in single crystal Ni-base superalloy AM3  

作　　者：余竹焕 刘林 赵新宝 张卫国 张军 傅恒志 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University [2]Material Science and Engineering Department,Xi'an Un iversity of Science and Technology

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第10期1835-1840,共6页中国有色金属学报（英文版）

基　　金：Projects(50771081, 50931004) supported by the National Natural Science Foundation of China;Project(2010CB631202) supported by the National Basic Research Program of China

摘　　要：In order to study the effect of the withdrawing rate on carbide morphology,MC-type carbide in single crystal superalloy AM3 was systematically investigated with sample growth rates from 3.5 μm/s to 500 μm/s.The carbide morphologies were investigated by scanning electron microscopy(SEM),and the electron probe microanalysis(EPMA) was used to characterize the carbide composition.The results indicate that the solidification rate is the important factor governing MC carbide growth morphology,size and distribution,composition and growth mechanism.With the increase of withdrawing rate,nodular,rod-like,Chinese script types of carbide morphology are observed.For the low withdrawing rate,with the increase of withdrawing rate,the carbide size becomes larger.For the case of dendritic interface,the carbide size becomes smaller with refinement of dendrites as withdrawing rate increases.The volume fraction of carbides increases with the withdrawing rate increasing.In order to study the effect of the withdrawing rate on carbide morphology,MC-type carbide in single crystal superalloy AM3 was systematically investigated with sample growth rates from 3.5 μm/s to 500 μm/s.The carbide morphologies were investigated by scanning electron microscopy（SEM）,and the electron probe microanalysis（EPMA） was used to characterize the carbide composition.The results indicate that the solidification rate is the important factor governing MC carbide growth morphology,size and distribution,composition and growth mechanism.With the increase of withdrawing rate,nodular,rod-like,Chinese script types of carbide morphology are observed.For the low withdrawing rate,with the increase of withdrawing rate,the carbide size becomes larger.For the case of dendritic interface,the carbide size becomes smaller with refinement of dendrites as withdrawing rate increases.The volume fraction of carbides increases with the withdrawing rate increasing.

关 键 词：single crystal Ni-base superalloy carbide morphology withdrawing rate 

分 类 号：TG132.32[一般工业技术—材料科学与工程]