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Coupled modelling of solidification and solution heat treatment of advanced single crystal nickel base superalloy
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0001-8797-4585
2009 (English)In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 25, no 2, 179-185 p.Article in journal (Refereed) Published
Abstract [en]

Two numerical models to simulate microsegregation and phase formation during directional solidification and subsequent solution heat treatment of an advanced experimental ruthenium containing single crystal nickel base superalloy are tested and compared. The first method is based on a one-dimensional front tracking for the primary solidification and a homogenisation method for the final stages of solidification as well as for the solution heat treatment. Calculations for this model are carried out in one-dimension using cylindrical coordinates. The second is based upon the phase field method, applied to solidification and subsequent solution heat treatment, where calculations are carried out in two-dimension. Both models are coupled to thermodynamic and kinetics databases modelled according to the CALPHAD method. A concept of computer based optimisation of solution heat treatments is proposed. The results show that both methods are capable of handling the complexity of contemporary superalloys, and realistic results are obtained from both models.

Place, publisher, year, edition, pages
2009. Vol. 25, no 2, 179-185 p.
Keyword [en]
Simulation, Phase field, Front tracking, Solidification, Solution heat, treatment, Superalloy, Thermodynamics, Microstructure modelling
URN: urn:nbn:se:kth:diva-18153DOI: 10.1179/174328408x369320ISI: 000263100600008ScopusID: 2-s2.0-60549117969OAI: diva2:336199
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-17Bibliographically approved

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