The creep deformation behavior and microstructure of a N-containing steel expected to exhibit high strength excellent oxidation resistance were investigated. Even for with W content, it was possible form martensitic by adding sufficient amount N. Comparison the microstructures C-containing confirmed that two steels have same crystal orientation relationship. precipitated Laves phase as strength...

During the flood development in an oil field, the creep characteristic of mudstone is one of the important factors causing casing damage. In this study, based on the theory of fractional order differential and taking into account the creep damage evolution rules, a fractional nonlinear creep-damage model is proposed to reflect the instantaneous deformation in loading processes and the accelerat...

The creep-fatigue interaction has been recognized as the main failure mode of most structural components operating in high-temperature regime. cyclic life (Nf) usually decreases continuously with dwell time their interactions. However, Nf shows an abnormal change, i.e. keeps constant or slightly increases/decreases, present studied Nickel-based superalloy, DZ445. This means that generalized “Nf...

The extraordinary creep-resistance of Mg-Nd-based alloys can be correlated to the formation of nanoscale-platelets of β1-Mg3Nd precipitates, that grow along 〈110〉Mg in bulk hcp-Mg and on dislocation lines. The growth kinetics of β1 is sluggish even at high temperatures, and presumably occurs via vacancy migration. However, the rationale for the high-temperature stability of precipitate-matrix i...

The tensile creep and creep-recovery behavior of a unidirectional Sic-fiher/Si,N,-matrix composite was investigated at 1200°C in air. A primary objective of the study was to determine how various sustained and cyclic creep loading histories would influence the creep rate, accumulated creep strain, and the amount of strain recovered upon specimen unloading. The key results obtained from the inve...

Some exploratory work on creep and inverse creep in nylon 6 monofilament, polyester multifilament yarn and wool and cotton spun yarns has been presented. It is observed that the extent of creep and inverse creep differs from material to material and depends on the initial stress. Cotton shows minimum inverse creep while nylon shows maximum inverse creep. Wool and polyester have intermediate inv...