An accelerated creep assessment method based on inelastic strain partitioning and slow strain rate testing

A new accelerated creep assessment method to evaluate the performance of metals and alloys from high-temperature tensile tests, i.e. slow-strain-rate testing (SSRT), is proposed evaluated. The consists decomposing inelastic strain into a plastic component by adopting general assumptions on behaviour materials, formulated using state variable formalism verified tests with intermediate dwell times at constant stress. Either, components are considered non-interacting additive, as observed in stainless steel AISI 316L 600 °C. Or, case ductile cast iron EN-GJS-SiMo5-1 500 °C nickel-base superalloy Hastelloy X 800 °C, unified, meaning that effect straining same irrespective whether it caused through stress or deformation due an instantaneous increase. Based these assumptions, used assess SSRT good agreement conventional test results.