The effect of the size distribution of inoculant particles on as-cast grain size in aluminium alloys

被引：384

作者：

Quested, TE ^{[1
]}

Greer, AL ^{[1
]}

机构：

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

来源：

ACTA MATERIALIA | 2004年 / 52卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

modelling; solidification microstructure; grain refining; aluminium alloys; particle size distribution;

D O I：

10.1016/j.actamat.2004.04.035

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A model based on free-growth control of grain initiation can quantitatively predict the grain size in aluminium alloys inoculated with commercial refiner as a function of refiner addition level, solute content in the melt and cooling rate. This model is applied to predict the performance of refiners with hypothetical size distributions of nucleant particles. The distributions are log-normal, like those in commercial refiners, but the mean particle diameter and the relative spread of the distribution are varied to map the performance of the refiner in giving minimum grain size, maximum efficiency, or minimum sensitivity of grain size to cooling rate. The optimal nucleant particle size distribution is a compromise between these aims and depends on the alloy and processing conditions. This mapping can assist in choosing between available refiners or in developing improved refiners. Existing commercial refiners are highly effective, but their nucleant particle size distribution leaves room for improvement. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3859 / 3868

页数：10

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