Modelling and simulation of A-segregates in steel castings using a thermal criterion function

Part I - Background and validation

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The present paper is the first out of two papers in which thermal criteria for modelling and
optimising, i.e. minimising, the formation of A segregates are investigated. One specific thermal
criterion has been incorporated into a transient three-dimensional thermal fluid model inside a
commercial simulation software package. It is then used for predicting A segregates inside a
large steel casting, i.e. a forging ram. In part I, experimental data obtained from a foundry serve to
validate the given criterion and to evaluate the critical value for A segregate initiation for one alloy
composition on the forging ram. In part II, the criterion forms the basis of shape optimisation of the
original casting layout for the ram. More specifically, unknown optimal shapes and sizes of the top
riser and chills are sought by means of autonomous optimisation to establish a better solidification
pattern, which would eliminate the likelihood of centreline porosity and A segregates.
Original languageEnglish
JournalMaterials Science and Technology
Volume28
Issue number7
Pages (from-to)872-878
ISSN0267-0836
DOIs
Publication statusPublished - 2012

Keywords

  • Casting process simulation
  • Steel casting
  • Centreline porosity
  • A segregates
  • Thermal criterion

Cite this

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title = "Modelling and simulation of A-segregates in steel castings using a thermal criterion function: Part I - Background and validation",
abstract = "The present paper is the first out of two papers in which thermal criteria for modelling and optimising, i.e. minimising, the formation of A segregates are investigated. One specific thermal criterion has been incorporated into a transient three-dimensional thermal fluid model inside a commercial simulation software package. It is then used for predicting A segregates inside a large steel casting, i.e. a forging ram. In part I, experimental data obtained from a foundry serve to validate the given criterion and to evaluate the critical value for A segregate initiation for one alloy composition on the forging ram. In part II, the criterion forms the basis of shape optimisation of the original casting layout for the ram. More specifically, unknown optimal shapes and sizes of the top riser and chills are sought by means of autonomous optimisation to establish a better solidification pattern, which would eliminate the likelihood of centreline porosity and A segregates.",
keywords = "Casting process simulation, Steel casting, Centreline porosity, A segregates, Thermal criterion",
author = "Petr Kotas and Hattel, {Jesper Henri}",
year = "2012",
doi = "10.1179/1743284712Y.0000000025",
language = "English",
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pages = "872--878",
journal = "Materials Science and Technology",
issn = "0267-0836",
publisher = "CRC Press/Balkema",
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}

Modelling and simulation of A-segregates in steel castings using a thermal criterion function : Part I - Background and validation. / Kotas, Petr; Hattel, Jesper Henri.

In: Materials Science and Technology, Vol. 28, No. 7, 2012, p. 872-878.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Modelling and simulation of A-segregates in steel castings using a thermal criterion function

T2 - Part I - Background and validation

AU - Kotas, Petr

AU - Hattel, Jesper Henri

PY - 2012

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N2 - The present paper is the first out of two papers in which thermal criteria for modelling and optimising, i.e. minimising, the formation of A segregates are investigated. One specific thermal criterion has been incorporated into a transient three-dimensional thermal fluid model inside a commercial simulation software package. It is then used for predicting A segregates inside a large steel casting, i.e. a forging ram. In part I, experimental data obtained from a foundry serve to validate the given criterion and to evaluate the critical value for A segregate initiation for one alloy composition on the forging ram. In part II, the criterion forms the basis of shape optimisation of the original casting layout for the ram. More specifically, unknown optimal shapes and sizes of the top riser and chills are sought by means of autonomous optimisation to establish a better solidification pattern, which would eliminate the likelihood of centreline porosity and A segregates.

AB - The present paper is the first out of two papers in which thermal criteria for modelling and optimising, i.e. minimising, the formation of A segregates are investigated. One specific thermal criterion has been incorporated into a transient three-dimensional thermal fluid model inside a commercial simulation software package. It is then used for predicting A segregates inside a large steel casting, i.e. a forging ram. In part I, experimental data obtained from a foundry serve to validate the given criterion and to evaluate the critical value for A segregate initiation for one alloy composition on the forging ram. In part II, the criterion forms the basis of shape optimisation of the original casting layout for the ram. More specifically, unknown optimal shapes and sizes of the top riser and chills are sought by means of autonomous optimisation to establish a better solidification pattern, which would eliminate the likelihood of centreline porosity and A segregates.

KW - Casting process simulation

KW - Steel casting

KW - Centreline porosity

KW - A segregates

KW - Thermal criterion

U2 - 10.1179/1743284712Y.0000000025

DO - 10.1179/1743284712Y.0000000025

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JO - Materials Science and Technology

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SN - 0267-0836

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