Paper Title:
Numerical Simulation on the Dendritic Spacing and Microporosity in A356 Alloy Ingot
  Abstract

A stochastic mathematic model contained the effects of dendrite morphology, solidification shrinkage and dissolved gases was formed to simulate microporosity formation and growth. Microporosities appear in the interspaces of primary dendrites as well as secondary dendrites from microscopic view of A356 aluminum alloy experimental ingot with a metal mold. In the past literatures it took the volumetric fraction of microporosities as a function of the local density. In the present work a single pore size and distribution were predicted concerning the combination of shrinkage and dissolved gases and dendritic spacing. The dendritic spacing is a main parameter to decide the pore pattern. For shrinkage and dissolved gases causes, the favorable one is determined by dendritic spacing, also the local cool rate and tip growth rate. The dense degree of the experimental ingots in different casting conditions was discussed. The variations of dens degree from the measured values in different casting conditions are similar to that of porosity volume fraction from the predicted results.

  Info
Periodical
Materials Science Forum (Volumes 575-578)
Edited by
Jitai NIU, Zuyan LIU, Cheng JIN and Guangtao Zhou
Pages
115-120
DOI
10.4028/www.scientific.net/MSF.575-578.115
Citation
P. Zhang, F. S. Du, Z. Q. Xu, L. L. Zhao, "Numerical Simulation on the Dendritic Spacing and Microporosity in A356 Alloy Ingot", Materials Science Forum, Vols. 575-578, pp. 115-120, 2008
Online since
April 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: M.L.N.M. Melo, R.G. Santos
Abstract:A particularly important defect related with solute segregation during solidification is the microporosity, which influences mechanical...
251
Authors: I. Basu, J.T. Wood, Jonathan P. Weiler
Chapter 11: Magnesium Alloys
Abstract:In this study, commercial AM60B magnesium alloy was studied under different solidification conditions to understand the influence of cooling...
1279
Authors: O.L. Rocha, A.L. Moreira, T.A. Costa, J.M.D. Filho, S.L. Paula, Adrina P. Silva
Abstract:The objective of this paper is to present an experimental study that aimed to establish correlations between primary dendrite spacing...
136
Authors: A.S. Barros, Adrina P. Silva, Ivaldo Leão Ferreira, O.L. Rocha, A.L. Moreira
Abstract:This paper presents a theoretical-experimental study for the prediction of the interfacial heat transfer coefficient during the horizontal...
10