Analysis on Fracture Mechanism of T92 Steel under High Temperature Multiaxial Creep

Hong Xu; Jun Yuan; Jing Liu; Sai Dong Huang; Chao Li; Xiao Wang; Yang Yu; Xue Ping Mao

doi:10.4028/www.scientific.net/AMR.941-944.1423

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 941-944Analysis on Fracture Mechanism of T92 Steel under...

Analysis on Fracture Mechanism of T92 Steel under High Temperature Multiaxial Creep

Abstract:

The high temperature creep tests of standard specimen and double U-notched specimen of T92 steel were carried out under different stresses at 600°C and 650 °C. Then scanning electron microscopy was used to observe the fracture morphology. The results show that the notch weakens plasticity, and weakening with the notch acuity. Under multiaxial stress state, the failure mode of T92 steel gradually transfers from ductile dimple to brittle quasi-cleavage fracture. Compared with uniaxial stress state, the dimples under multiaxial stress state are smaller and shallower, within lots of carbides and second phase particles. The notch slows the connection, growth and gather of microvoids, and exhibits notch strengthening effect.

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Periodical:

Advanced Materials Research (Volumes 941-944)

Pages:

1423-1427

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.941-944.1423

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Online since:

June 2014

Authors:

Hong Xu*, Jun Yuan, Jing Liu, Sai Dong Huang, Chao Li, Xiao Wang, Yang Yu, Xue Ping Mao

Keywords:

Fracture Mechanism, Fracture Morphology, Multiaxial Creep, T92 Steel

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