Abstract
The high temperature creep test of P92 materials were carried out under different stresses at 600 °C and 650 °C, the microstructure of creep fracture appearance of samples was examined, the stress index n was fitted by Power Law Equation, and damage tolerance factor λ was calculated out. The results show that the ratio of creep fracture time vs. starting time of accelerating creep stage is range 1.4 to 1.8; the stress index n is 17 and 15, respectively; and damage tolerance factor λ is 3.1 and 3.26, respectively. According to stress index n and damage tolerance factor λ , the movement of dislocation leads to accelerating creep and final fracture. The results also show that P92 steel has good high temperature plasticity; micro fracture shows obvious dimple fracture characteristics and the second phase. Precipitation hardening effect from Laves-phase has the most influence on creep stability. At high temperature, dislocation density is decreased by rapid formation of Laves-phase, which lowers the fracture strengthening and accelerates creep fracture.
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