Microstructure and Solidification Sequence of the Interdendritic Region in a Third Generation Single-Crystal Nickel-Base Superalloy

被引：53

作者：

Pang, H. T. ^{[1
]}

Dong, H. B. ^{[2
]}

Beanland, R. ^{[1
]}

Stone, H. J. ^{[1
]}

Rae, C. M. F. ^{[1
]}

Midgley, P. A. ^{[1
]}

Brewster, G. ^{[3
]}

D'Souza, N. ^{[3
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

[2] Univ Leicester, Dept Engn, Leicester LE1 7RH, Leics, England

[3] Rolls Royce PLC, Derby DE24 8BJ, England

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2009年 / 40A卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

MICROSEGREGATION;

D O I：

10.1007/s11661-009-9855-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An analysis of the microstructure of the interdendritic regions in an as-cast third generation single-crystal nickel-base superalloy CMSX-10K has been carried out using automated serial sectioning with sequential focused ion beam (FIB) milling and image capture of the secondary electron image in a combined FIB-scanning electron microscope (SEM). Two interdendritic morphologies with vastly different gamma/gamma' spacing were identified; these are (1) fine gamma/gamma' morphology and (2) coarse cellular gamma' separated by narrow gamma channels. The FIB results indicate that following primary solidification (L -> gamma), solidification of the interdendritic region commences in areas that show the fine gamma/gamma' morphology, (1) on the gamma dendrite lobe. This is followed by a gradual transition to growth of the coarse cellular gamma/gamma' channel structure, (2) which occur up to the termination of the solidification process.

引用

页码：1660 / 1669

页数：10

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