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Design of Reduced Activation Ferritic/Martensitic Steels with Improved Creep Resistance by Thermodynamic Modelling

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Document pages: 44 pages

Abstract: An approach based on the systematic use of thermodynamic modelling has been worked out and applied for the development of reduced activation ferritic martensitic (RAFM) steels with improved creep resistance by composition and temperature tuning. Initially, a series of Thermo-Calc® calculations was performed to construct a database of phase equilibria. Based on this database and constraints deduced from literature, heat treatment temperatures and compositions, potentially leading to better creep resistance, were identified. The search algorithm was then fine-tuned by adding new constraints to find compositions and accompanying heat treatments that should result in the anticipated improved mechanical properties. An experimental heat resembling an optimized alloy according to the model was characterized and found to show improved creep resistance compared to the reference steel, EU97-2, thereby validating the model.

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