Analysis on Creep Behaviors at High Temperature and Fracture Morphology of P92 Steels

Jun Yuan; Hong Xu; Xiao Wang; Yang Yu; Xue Ping Mao; Su Yang Hu

doi:10.4028/www.scientific.net/AMR.690-693.1757

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 690-693Analysis on Creep Behaviors at High Temperature...

Analysis on Creep Behaviors at High Temperature and Fracture Morphology of P92 Steels

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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Periodical:

Advanced Materials Research (Volumes 690-693)

Pages:

1757-1761

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.690-693.1757

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Online since:

May 2013

Authors:

Jun Yuan, Hong Xu, Xiao Wang, Yang Yu, Xue Ping Mao, Su Yang Hu

Keywords:

Creep, Fracture Morphology, Microstructure, P92 Steel

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