Microstructurally Informed Material Model for Haynes® 282

The precipitationPrecipitation strengthened alloy Haynes® 282 possesses very good strength, creep resistanceCreep resistance and corrosion resistance at high temperaturesHigh temperature. It is one of the best candidates for a range of high temperatureHigh temperature components for next generation of power systems as Advanced Ultra-Supercritical (A-USC) boilers and steam turbines, Supercritical carbon dioxide (sCO2) power cycles as well for aerospace gas turbine parts (combustor lines, nozzles, exhaust sections). Some of these components operate for very long time (30–40 years) during which they are subjected to high temperatureHigh temperature (up to 60% of the Liquidus Temperature, Tm) creepCreep as well as cyclic loading (cyclic temperature and stress variations). Assessing long term material behavior through combined accelerated testing and model predictions is an important step in the material qualification process. Towards this goal, a material constitutive model was developed capturing long term creepCreep as well as cyclic plasticity, with and without hold time at two temperatures: 593 and 760 °C. The model was calibrated on creepCreep and low cycle fatigueLow cycle fatigue tests performed on smooth specimens. The model predictions were compared with experimental data performed on smooth circular and on notched specimens, in terms of stress–strain response and number of cycles to failure.