Conference proceeding
Modeling the effect of finite-rate hydrogen diffusion on porosity formation in aluminum alloys
Metallurgical and materials transactions. B, Process metallurgy and materials processing science, Vol.38(4), pp.541-555
2007
DOI: 10.1007/s11663-006-9013-2
Abstract
A volume-averaged model for finite-rate diffusion of hydrogen in the melt is developed to predict pore formation during the solidification of aluminum alloys. The calculation of the micro-/macro-scale gas species transport in the melt is coupled with a model for the feeding flow and pressure field. The rate of pore growth is shown to be proportional to the local level of gas supersaturation in the melt, as well as various microstructural parameters. Parametric studies of one-dimensional solidification under an imposed temperature gradient and cooling rate illustrate that the model captures important phenomena observed in porosity formation in aluminum alloys. The transition from gas to shrinkage dominated porosity and the effects of different solubilities of hydrogen in the eutectic solid, capillary pressures at pore nucleation, and pore number densities are investigated in detail. Comparisons between predicted porosity percentages and previous experimental measurements show good correspondence, although some uncertainties remain regarding the extent of impingement of solid on the pores.
Details
- Title: Subtitle
- Modeling the effect of finite-rate hydrogen diffusion on porosity formation in aluminum alloys
- Creators
- Kent D CARLSON - Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242, United StatesZhiping Lin - Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242, United StatesChristoph BECKERMANN - Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242, United States
- Resource Type
- Conference proceeding
- Publication Details
- Metallurgical and materials transactions. B, Process metallurgy and materials processing science, Vol.38(4), pp.541-555
- Publisher
- Springer; Heidelberg
- DOI
- 10.1007/s11663-006-9013-2
- ISSN
- 1073-5615
- eISSN
- 1543-1916
- Language
- English
- Date published
- 2007
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984064567402771
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