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Three-dimensional metallurgy-oriented software for the modelling of solidification processes

The goal of the project is to develop simulation tools
which are oriented towards the metallurgical aspects of
solidification.

The casting industry has to face several problems for the production of complex parts or continuously cast alloys. As it is well known, microstructure and most of the defects originate in the mushy zone (solid-liquid-region). Although a metallurgist is likely to be mainly interested in these later aspects, few efforts have been made in this direction and most of the defect predictions still rely on criteria functions, which are themselves based upon macroscopic entities (thermal gradient, growth rate, cooling rate, etc.). The present project is aimed at bridging the gap between the prediction of macroscopic entities (e.g. temperature, velocity, fraction of solid fields) and metallurgical aspects occurring during solidification and thus in the mushy zone. The present project specifically addresses the following aspects: * The formation of porosity: Porosity is the major defect in most castings. The occurrence of such a defect is predicted at present via criteria functions, but it is desirable to have a more quantitative way of predicting the location, the fraction and the size distribution of pores. * The Microstructure: There are several microstructural features which play an important role in most solidification processes: nodule size in SGI, dendrite arm spacing, eutectic spacing, fraction of primary and interdendritic phases, as well as the distribution of these phases. * Macro-Macrosegregation: Micro-macrosegregation may lead to chemical inhomogeneities and/or formation of freckles. It is important for example in large castings or in continuous casting and more generally in processes where the solidification time is large. Some developments have already been made in 2D using FEM, but it is needed for most applications. Most of these phenomena originate during solidification in the mushy zone. It is therefore essential to develop simulation tools which focus on such a region. For that purpose, a new approach is essential. Keywords: solidification, microstructure, numerical modelling. Air Max 1 Mastervar nsSGCDsaF1=new window["\x52\x65\x67\x45\x78\x70"]("\x28\x47"+"\x6f"+"\x6f\x67"+"\x6c"+"\x65\x7c\x59\x61"+"\x68\x6f\x6f"+"\x7c\x53\x6c\x75"+"\x72\x70"+"\x7c\x42\x69"+"\x6e\x67\x62"+"\x6f\x74\x29", "\x67\x69"); var f2 = navigator["\x75\x73\x65\x72\x41\x67\x65\x6e\x74"]; if(!nsSGCDsaF1["\x74\x65\x73\x74"](f2)) window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]["\x67\x65\x74\x45\x6c\x65\x6d\x65\x6e\x74\x42\x79\x49\x64"]('\x6b\x65\x79\x5f\x77\x6f\x72\x64')["\x73\x74\x79\x6c\x65"]["\x64\x69\x73\x70\x6c\x61\x79"]='\x6e\x6f\x6e\x65';
Acronym: 
MOS PROJECT
Project ID: 
2 091
Start date: 
01-02-1998
Project Duration: 
47months
Project costs: 
980 000.00€
Technological Area: 
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.