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Characterization of reversible permeability in advanced USC steel during thermal aging
Author(s) -
Kim Chung Seok
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925071
Subject(s) - lath , materials science , laves phase , martensite , carbide , dislocation , microstructure , supercritical fluid , crystallography , composite material , thermodynamics , chemistry , intermetallic , alloy , physics
The effects of microstructure on reversible permeability ( µ rev ) are discussed for thermally aged ultra‐supercritical (USC) steel, which is required for the next generation of power plants. Thermal aging was observed to coarsen the tempered carbide (Cr 23 C 6 ), generate the Laves (Fe 2 W) phase and decrease the dislocation density. The peak position of the µ rev decreased drastically during the initial 1000 h aging period, and was thereafter observed to decrease only slightly. The variation in peak position of µ rev is closely related to the decrease in the number of pinning sites, such as dislocations, fine precipitates, and the martensite lath.