Overview of the co-operative efforts aiming at the correct characterisation of the thermomechanical behaviour of materials during the process of a phase change. Physical conditions for the onset of transformation processes. Chemical driving forces in a multi-component system. Formulation of transformation criteria. Description of the mechanism governing the selection of a particular martensitic variant of the product phase out of a discrete number of possible variants. Experimental program investigating the thermomechanical behaviour of a maraging steel with special properties in the transformation regime. TRIP strain evolution during transformation. Material law for nonproportional loading paths. Validation of experimental findings by means of a numerical algorithm.
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