Creep Deformation and Rupture Behaviour of P92 Steel at 923 K

Applicability of Voce equation for tensile flow and work hardening behaviour of P92 ferritic steel

“…A change in controlling mechanism from cross-slip to dislocation climb and subboundary migration at high temperatures leads to high n V,Voce values [22,23] as observed in the present investigation. The dominance of dynamic recovery in terms of climb of dislocations and subboundary migration as controlling deformation mechanism at high temperatures is further demonstrated by correlating applied strain rate dependence of saturation stress [40] or steady state stress with stress dependence of minimum creep rate obtained for the steel. The variations of minimum creep rate (_ ε) and applied strain rate with the respective applied stress (s) and saturation stress obeying power law creep is shown at 923 K in Fig.…”

The effect of hot bending and thermal ageing on creep and microstructure evolution in thick-walled P92 steel pipe

“…Further, for any bending process, upon bending deformation, the complex uneven tension and compression stress distributions are introduced at the extrados and intrados of bending pipe respectively, which may cause multiple defects or instabilities [33,34]. Creep cavities [5,25,[35][36][37][38][39][40] were observed to a limited extent in the crept specimens of both states probably because of localized plastic deformation during the tertiary stage of creep. Cavities had an elongated shape along the loading direction (Fig.…”

Prediction of creep crack growth behavior in Cr–Mo–V steel specimens with different constraints for a wide range of C∗

“…(4) is usually assumed to be a constant for a given temperature. However, a lot of experimental results and analyses have shown that the creep fracture mechanism depends on stress levels (strain rates), which leads to the stress-regime dependence of the creep ductility of materials [29][30][31][32][33][34][35]. At high stress regime, the creep fracture process is dominated by plasticity controlled void growth, and the creep ductility has an upper shelf value [30].…”