Alloy composition and metal/mold heat transfer efficiency affecting inverse segregation and porosity of as-cast Al-Cu alloys

被引：72

作者：

Boeira, Alexandre P. ^{[2
]}

Ferreira, Ivaldo L. ^{[1
]}

Garcia, Amauri ^{[1
]}

机构：

[1] Univ Estadual Campinas, Dept Mat Engn, BR-13083970 Campinas, SP, Brazil

[2] CEFETRS, Fed Ctr Technol Educ Pelotas, BR-99064440 Passo Fundo, RS, Brazil

来源：

MATERIALS & DESIGN | 2009年 / 30卷 / 06期

基金：

巴西圣保罗研究基金会;

关键词：

Non ferrous metals and alloys; Casting; Thermal analysis; MICROPOROSITY FORMATION; UNIDIRECTIONAL SOLIDIFICATION; TENSILE PROPERTIES; MACRO SEGREGATION; HYDROGEN POROSITY; NUMERICAL SCHEME; MACROSEGREGATION; MODEL; SIMULATION; COPPER;

D O I：

10.1016/j.matdes.2008.08.032

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Porosity is one of the most important defects in metals casting. In this study, macrosegregation and porosity formation were investigated by a numerical model and by solidification experiments. The local composition along the length of Al-Cu castings was calculated by the macrosegregation model and used as an input parameter for simulation of microporosity. The effects exerted by gravity upon the solute redistribution and microporosity are also encompassed by this model. X-ray fluorescence spectrometry was used to determine the segregation profiles. The measurement of microporosity was performed using pyknometry analysis. The results have demonstrated that both the decrease on alloy solute content and the increase on metal/mold heat transfer coefficient are connected to lower porosity levels at regions closer to the casting surface. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2090 / 2098

页数：9

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