A non-isothermal model was developed including viscoplastic deformation, phase transformations and their interactions. The model was applied to a 12% chromium steel for temperatures between RT and 1600K. Austenite transformation, martensite transformation and the constitution of carbides were identified to affect the mechanical behaviour of the martensitic steel investigated. A generalized Johnson-Mehl-Avrami equation and the Koistinen-Marburger equation were used to describe these phase transformations. Viscoplastic deformations were modelled with an isothermal Chaboche-type model which was extended to non-isothermal conditions. Tensile, cyclic and relaxation test data were used to identify the model parameters.
Description of the material behaviour in girth welds during weld fabrication and for high temperature service
2002
10 Seiten, 4 Bilder, 13 Quellen
Aufsatz (Konferenz)
Englisch
Chromstahl , Erweichen , Gefüge (Werkstoff) , Kriechen (Werkstoff) , mathematisches Modell , Mikrostruktur , Phasenanalyse , Phasenänderung , Phasenübergang , Phasenumwandlung , schweißbarer Stahl , Schweißbarkeit , Schweißbarkeitsversuch , Schweißbedingung , Schweißnaht , Simulation , Spannungsrelaxation , Viskoplastizität , Chrom-Molybdän-Vanadium-Stahl
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