An analysis of measurement of solute segregation in Ni-base superalloys using X-ray spectroscopy

被引：28

作者：

D'Souza, N. ^{[1
]}

Lekstrom, M. ^{[2
]}

Dong, H. B. ^{[1
,3
]}

机构：

[1] Precis Casting Facil, Derby DE24 8BJ, England

[2] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 490卷 / 1-2期

关键词：

nickel alloys; solidification; solute segregation; energy dispersive X-ray spectroscopy; phase averaging;

D O I：

10.1016/j.msea.2008.01.025

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The extent of solute segregation in a multi-component Ni-base superalloy, IN713LC, is analysed using X-ray spectroscopy techniques. It is demonstrated in this study that such an analysis is strongly influenced by the volume averaging of -y and -y'phases sampled by the electron beam; the -y' having precipitated from the -y phase below the -y' solvus temperature in the solid-state. It is found that the size of the precipitate (- ') in relation to the interaction volume is crucial; volume averaging is dominant when the precipitate size (y') is comparable to the interaction volume. Accurate interpretation of the measurements is essential when they are used to infer the micro- segregation and solute partitioning during solidification. Implications of this analysis in the assessment of segregation during solidification in Ni-base superalloys are addressed. (c) 2008 Elsevier B.V All rights reserved.

引用

页码：258 / 265

页数：8

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