The columnar to equiaxed transition during solidification of Sn-Pb alloys

被引：59
|
作者：
Siqueira, CA [1 ]
Cheung, N [1 ]
Garcia, A [1 ]
机构：
[1] Univ Estadual Campinas, UNICAMP, Dept Mat Engn, BR-13083970 Campinas, SP, Brazil
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2003年 / 351卷 / 1-2期
关键词：
alloys; casting; solidification; macrostructure;
D O I：
10.1016/S0925-8388(02)01026-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present article, some important trends are shown regarding the influence of solidification thermal parameters on the columnar to equiaxed transition (CET) during the unsteady state solidification of Sn-Pb alloys. A comparison of the results obtained in the present work with results from the literature concerning similar experiments, but undertaken under conditions of lower heat transfer efficiency at the metal-mold interface, has shown that a realistic CET criterion should be based on a critical cooling rate at the dendrite tips of about 0.014 K/s, which depends only on the alloy system. The effects of melt superheat, solute concentration and metal-mold heat transfer coefficient on the CET position are also investigated. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：126 / 134
页数：9
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