Thermal strain in the mushy zone related to hot tearing

Stangeland, A., Mo, A., MHamdi, M., Viano, D. and Davidson, C. (2006) Thermal strain in the mushy zone related to hot tearing. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 35A, 37 3: 705-714. doi:10.1007/s11661-006-0042-x

Author Stangeland, A.
Mo, A.
MHamdi, M.
Viano, D.
Davidson, C.
Title Thermal strain in the mushy zone related to hot tearing
Journal name Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 35A   Check publisher's open access policy
ISSN 1073-5623
Publication date 2006-03
Sub-type Article (original research)
DOI 10.1007/s11661-006-0042-x
Open Access Status
Volume 37
Issue 3
Start page 705
End page 714
Total pages 10
Place of publication United States
Publisher Springer New York LLC
Collection year 2006
Language eng
Subject C1
291302 Physical Metallurgy
671004 Castings
0912 Materials Engineering
Abstract A volume-averaged two-phase model addressing the main transport phenomena associated with hot tearing in an isotropic mushy zone during solidification of metallic alloys has recently been presented elsewhere along with a new hot tearing criterion addressing both inadequate melt feeding and excessive deformation at relatively high solid fractions. The viscoplastic deformation in the mushy zone is addressed by a model in which the coherent mush is considered as a porous medium saturated with liquid. The thermal straining of the mush is accounted for by a recently developed model taking into account that there is no thermal strain in the mushy zone at low solid fractions because the dendrites then are free to move in the liquid, and that the thermal strain in the mushy zone tends toward the thermal strain in the fully solidified material when the solid fraction tends toward one. In the present work, the authors determined how variations in the parameters of the constitutive equation for thermal strain influence the hot tearing susceptibility calculated by the criterion. It turns out that varying the parameters in this equation has a significant effect on both liquid pressure drop and viscoplastic strain, which are key parameters in the hot tearing criterion. However, changing the parameters in this constitutive equation will result in changes in the viscoplastic strain and the liquid pressure drop that have opposite effects on the hot tearing susceptibility. The net effect on the hot tearing susceptibility is thus small.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
2007 Higher Education Research Data Collection
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Citation counts: TR Web of Science Citation Count  Cited 21 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 07:57:13 EST