Modelling heat-to-heat variability in high temperature cyclic deformation behaviour

• Published in: Materials at high temperatures Vol. 32; no. 3; pp. 347 - 354
• Main Authors: Hosseini, E., Holdsworth, S. R., Kühn, I., Mazza, E.
• Format: Journal Article
• Language: English
• Published: Leeds Taylor & Francis 01.05.2015; Taylor & Francis Ltd
• Subjects: 10%Cr steel; Alloys; Behavior; Chaboche model; Constitutive modelling; Cyclic plasticity; Deformation; Derivation; Heat; Heat to heat variability; Kinematics; Mathematical models; Metal fatigue; Representations; Strain hardening; Stress-strain relationships; Thermal cycling
• ISSN: 0960-3409; 1878-6413
• DOI: 10.1179/0960340914Z.00000000078

In high temperature engineering design, representations of the cyclic deformation behaviour of the material of the component are required as analysis data input to determine the stress-strain state at critical locations and ultimately component lifetime. While description of the cyclic stress-strain properties for a single heat of an alloy is relatively straightforward, even using complex constitutive model formulations, the same is not necessarily true for the derivation of mean or minimum alloy property representations. A novel method has recently been developed for this purpose. The concept is demonstrated for a high temperature steel for temperatures between 22°C and its maximum application temperature using the non-linear kinematic strain hardening model of Chaboche applied to the mid-life cyclic/hold data for a number of heats of the alloy.