Grain growth behaviour during near-γ′ solvus thermal exposures in a polycrystalline nickel-base superalloy

被引：90

作者：

Collins, D. M. ^{[1
]}

Conduit, B. D. ^{[2
]}

Stone, H. J. ^{[3
]}

Hardy, M. C. ^{[2
,4
]}

Conduit, G. J.

Mitchell, R. J. ^{[2
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

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

[3] Univ Cambridge, Dept Mat Sci & Met, Rolls Royce UTC, Cambridge CB2 3QZ, England

[4] Univ Cambridge, Cavendish Lab, Dept Phys, Condensed Matter Theory Grp, Cambridge CB3 0HE, England

来源：

ACTA MATERIALIA | 2013年 / 61卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

Grain growth; Precipitation; Coarsening; Heat treatment; MICROSTRUCTURE; ALLOYS; METALS;

D O I：

10.1016/j.actamat.2013.02.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The grain growth behaviour that occurs during near solvus isothermal and transient heat treatments and the influence of primary gamma' has been studied in the advanced polycrystalline nickel-base superalloy, RR1000. Experimental observations showed that grain growth can be related to (D) over bar (lim), a theoretical grain size limit that accounts for the time dependent pinning contribution from the full primary gamma' precipitate size distribution. This term was also used to describe the pinning contribution from MC carbides, which limits grain size in the absence of primary gamma'. The values of (D) over bar (lim) were calculated using both experimental data and simulated data obtained from the software, PrecipiCalc. The Andersen Grong grain growth model was modified to incorporate the pinning effect of primary gamma' and MC carbides. This was used to predict the grain sizes for a range of heat treatment times, incorporating the calculated (D) over bar (lim) values. Material-dependent grain growth coefficients were simultaneously fitted by minimizing the difference between the simulated and experimental grain sizes. Good correlation was achieved between the modelled and experimental grain sizes, though agreement was superior with PrecipiCak data. This was attributed to the removal of experimental scatter, found to be important when using this method. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3378 / 3391

页数：14

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