Effect of Aging on the Creep Properties and Microstructural Evolution of P92 Steel

Yin Sheng He; Jung Chel Chang; Jeh Yun Lee; Kee Sam Shin

doi:10.4028/www.scientific.net/KEM.727.52

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 727Effect of Aging on the Creep Properties and...

Effect of Aging on the Creep Properties and Microstructural Evolution of P92 Steel

Abstract:

The P92 steels were aged at 632°C for 500hrs and 1,000hrs, and creep ruptured at 650°C~625°C with stress of 120~110 MPa. The creep rupture life (CRL) of the aged samples was decreased with the aged time. The microstructure of the P92 steel was observed as fine tempered lath with dispersion of Cr-rich M₂₃C₆ along various grain boundaries. Upon aging and creep, recovery of lath and precipitation of coarse W-rich Laves phase were characterized as the main microstructural change. The M₂₃C₆ is relatively stable upon the short-term aging and creep. Decrease of the CRL of the aged specimens is considered as the degradations of microstructure such as the recovery of lath due to the dislocation annihilation and precipitation of coarse Laves phase.

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Periodical:

Key Engineering Materials (Volume 727)

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52-58

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.52

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Online since:

January 2017

Authors:

Yin Sheng He, Jung Chel Chang, Jeh Yun Lee, Kee Sam Shin

Keywords:

Aging, Creep Rupture Life, EBSD, P92 Steel, TEM

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