Equiaxed grains in multicomponent alloys: Effect of growth rate

被引：23

作者：

Hodaj, F ^{[1
]}

Durand, F ^{[1
]}

机构：

[1] EPM,MADYLAM,CNRS,F-38402 ST MARTIN DHER,FRANCE

来源：

ACTA MATERIALIA | 1997年 / 45卷 / 05期

关键词：

D O I：

10.1016/S1359-6454(96)00304-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of growth rate on the formation of equiaxed grains in recalescence conditions is studied using a model adapted From Maxwell and Hellawell. This model numerically simulates the nucleation and initial growth of equiaxed crystals. The relationship between growth rate and undercooling is assumed to be controlled by diffusion. This relationship is extended to multicomponent alloys. The growth rate increases as a reciprocal function of a new parameter, denoted by U, which represents the chemical effect. The calculated grain density increases with U, and with the cooling rate. Comparable tendencies are observed on values measured in Al alloys. (C) 1997 Acta Metallurgica Inc.

引用

页码：2121 / 2127

页数：7

共 9 条

[1] DIFFUSION-LIMITED PHASE TRANSFORMATIONS - A COMPARISON AND CRITICAL EVALUATION OF MATHEMATICAL APPROXIMATIONS [J].

AARON, HB ;

FAINSTEIN, D ;

KOTLER, GR .

JOURNAL OF APPLIED PHYSICS, 1970, 41 (11) :4404-+

[2] PREDICTION OF EQUIAXED GRAIN DENSITY IN MULTICOMPONENT ALLOYS, STIRRED ELECTROMAGNETICALLY [J].

DESNAIN, P ;

FAUTRELLE, Y ;

MEYER, JL ;

RIQUET, JP ;

DURAND, F .

ACTA METALLURGICA ET MATERIALIA, 1990, 38 (08) :1513-1523

[3]

DESNAIN P, 1989, THESIS INP GRENOBLE

[4]

DESNAIN P, 1992, CAST MET, V5, P78

[5]

DURAND F, 1990, P 6 INT IR STEEL C J, P559

[6] DENDRITIC GROWTH INTO UNDERCOOLED ALLOY MELTS [J].

LIPTON, J ;

GLICKSMAN, ME ;

KURZ, W .

MATERIALS SCIENCE AND ENGINEERING, 1984, 65 (01) :57-63

[7] SIMPLE MODEL FOR GRAIN REFINEMENT DURING SOLIDIFICATION [J].

MAXWELL, I ;

HELLAWELL, A .

ACTA METALLURGICA, 1975, 23 (02) :229-237

[8]

NGUYEN LT, 1990, MEM ETUDES SC RE DEC, P749

[9]

RIQUET JP, COMMUNICATION

← 1 →