Multi-axial thermo-mechanical analysis of power plant components from 9–12% Cr steels at high temperature |
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Authors: | Konstantin Naumenko Andreas Kutschke Yevgen Kostenko Thorsten Rudolf |
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Affiliation: | aMartin-Luther-University Halle-Wittenberg, Center of Engineering Sciences, 06099 Halle, Germany;bSiemens AG, Energy Sector, Rheinstr. 100, 45478 Mülheim an der Ruhr, Germany |
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Abstract: | The aim of this paper is to analyze local changes of stress and strain states in a power plant component under a transient thermal environment. A robust constitutive model is developed to describe inelastic behavior of advanced 9–12% Cr heat-resistant steels at high temperature and in a multi-axial stress state. The model includes the constitutive equation for the inelastic strain rate tensor, the evolution equation for a tensor-valued state variable to reflect hardening/recovery processes and two evolution equations for two scalar-valued variables that characterize softening and damage states. The model is calibrated against experimental creep curves and verified for inelastic responses under different isothermal and non-isothermal loading paths. Steam temperature and loading profiles that correspond to an idealized start-up, holding and shut-down sequence of a power plant component are assumed. To estimate the thermal fields, transient heat transfer analysis is performed. The results are applied in the subsequent structural analysis using the developed inelastic constitutive model. The outcome is a multi-axial thermo-mechanical fatigue loop which can be used for damage assessment. |
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Keywords: | Advanced 9&ndash 12% Cr steels Inelastic constitutive model Power plant component Heat transfer analysis Thermo-mechanical fatigue |
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