Numerical investigation of solidification processes of cylindrical ingots in a metal mould at variable technological circumstances

Chernogorova, Tatiana P.; Вабищевич, П. Н.

doi:10.1016/s0017-9310(99)00002-2

Cited by 10 publications

(4 citation statements)

References 1 publication

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“…For instance in [4], the problem of describing the thermomechanical behavior of polymer materials in conditions of relaxation conversions is considered in detail. It should be noted that modeling the constitutive relations for describing the crystallization process with the relaxation conversions has wide practical application: in mechanical engineering industry [5], aircraft industry [6], metallurgy [7,8], microstructure [9] of materials and etc. It is possible to conclude that to obtain and to verify the constitutive relations for the crystallization process with a relaxation conversion are the basis of the solution of the problem of this type and a very laborconsuming process.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of isotropic beam crystallization process under nonuniform cooling

Suhodoeva¹,

Kamenskikh²,

Bartolomey³

2017

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)

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Abstract-The study is directed to conclusion and approbation of the new defining relations that describe arousal and change of stress fields in isotropic material during crystallization, taking into account temperature strains and structural shrinkage. The statement of the crystallization problem and numerical realization of the process by the example of linear and plane statements have been made. The problem of crystallization of a beam of isotropic material under nonuniform cooling with phase transitions has been considered. The authors removed the defining relations describing the occurrence and change of stress fields in an isotropic material during crystallization, taking into account temperature deformations and structural shrinkage. The numerical realization of the problem of crystallization of a beam was made by two methods: a finite difference method and a finite element method. The tendency of accumulation of an error of the finite difference method has been established. The verification of defining relations by the example of the problem of plate nonuniform controlled cooling from temperature above melting point has been made at the second stage of the study. Displacement, stress and strain fields that satisfy the physics of the process and boundary conditions have been obtained.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of isotropic beam crystallization process under nonuniform cooling

Suhodoeva¹,

Kamenskikh²,

Bartolomey³

2017

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)

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“…Bilir and Ilkenstudy [9] used the enthalpy method with a control volume approach to analyze the inward solidification of a liquid encapsulated in a cylindrical container in presence of melt superheat. Most of the works reported in the literature are based on theoretical approaches [10][11] and only few of them integrate numerical simulations and experimental data [12].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of Inward, Outward and Upward Solidification of an Al-1.5wt%Fe Alloy in Cylindrical Chill Molds

Bertelli

Meza

Bezerra

et al. 2012

MSF

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In this work, three water-cooled experimental solidification devices were developed, and experiments were carried out with an Al-1.5wt%Fe alloy. The three experimental setups consist of vertical cylindrical steel molds with each of them having different zones cooled by water. For the inward solidification, a cooled tube is used having its upper and bottom part thermally insulated. For the outward solidification, a cooled tube, forming an inner part, is concentrically placed inside a cylindrical mold, which is thermally insulated from the environment, by using insulating materials. For the upward solidification, the bottom part of the mold is water-cooled and consists of a thin (3 mm) disc of carbon steel, whilst the cylindrical surface is covered with insulating material to avoid lateral heat losses. A numerical solidification model based on the finite difference method is applied for the simulation of the three aforementioned cases of solidification from the chilled surface considering transient heat flow conditions. Experimental thermal readings in the castings have been used for the determination of the transient overall metal/coolant heat transfer coefficient, h, through a numerical-experimental fit of casting thermal profiles based on inverse heat transfer calculations. It was found a significant variation of h as a function of time during solidification in the three cylindrical set-ups experimentally examined, including a remarkable increase in h during the outward solidification. Introduction

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“…No lingotamento contínuo horizontal de geometrias cilíndricas, além da necessidade do controle do processo de solidificação para a formação de uma casca no molde suficientemente espessa para suportar as tensões de extração do lingote [Brimacombe et al, 1984a] No que se refere aos estudos em geometrias não planas, objetivo desse trabalho, o sistema de coordenadas cilíndricas é empregado em estudos numéricos da simulação da solidificação de lingotes cilíndricos ou em esferas [Riley et al, 1974;Chernogorova, 1999;Zal'tsman, 1996;Majchrzak, 2000;Bilir, 2005]. A Figura 1.4 apresenta um esquema dos tipos de superfície de troca térmica que podem ser encontrados na solidificação radial em sistemas cilíndricos, onde uma superfície côncava gera um tubo solidificado de dentro para fora e uma superfície convexa forma um cilindro maciço, solidificado de fora para dentro.…”

Section: Considerações Iniciaisunclassified

“…Os métodos numéricos atualmente mais utilizados e amplamente estudados são os métodos de diferenças finitas (MDF) [Chernogorova, 1999; e os métodos dos elementos finitos (MEF) [Reddy, 1993;Sha, 2011] para o desenvolvimento de modelos relacionados aos fenômenos de transferência de calor na solidificação. No entanto, o equacionamento do MEF é bem mais complexo que o MDF, sendo este último mais simples e direto [Spim, 2001].…”

Section: Considerações Iniciaisunclassified

Modelagem numérica e análise experimental de parâmetros térmicos e microestruturais na solidificação radial de ligas binárias

Bertelli¹,

Garcia²

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Numerical investigation of solidification processes of cylindrical ingots in a metal mould at variable technological circumstances

Cited by 10 publications

References 1 publication

Numerical investigation of isotropic beam crystallization process under nonuniform cooling

Numerical investigation of isotropic beam crystallization process under nonuniform cooling

Heat Transfer Characteristics of Inward, Outward and Upward Solidification of an Al-1.5wt%Fe Alloy in Cylindrical Chill Molds

Modelagem numérica e análise experimental de parâmetros térmicos e microestruturais na solidificação radial de ligas binárias

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