Premium
The characterization of various chromium carbide compounds in X20CrMoV121 steel
Author(s) -
Skobir Danijela A.,
Jenko Monika,
Mandrino Djordje
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1806
Subject(s) - cementite , carbide , chromium , metallurgy , microstructure , materials science , annealing (glass) , atmospheric temperature range , chromium carbide , molybdenum , austenite , thermodynamics , physics
The X20CrMoV121 steels, intended for high‐temperature components in power plants, show during thermal and creep exposure in the range of 650 to 800 °C a pronounced change in microstructure. This means that during use in this temperature range virtually all carbon is bound to carbide precipitates. The large particles that at first appear on subgrain boundaries are mainly cementite (Fe 3 C). When the chromium concentration in cementite rises above the solubility limit, the carbide of type M 23 C 6 is formed with chromium, iron and molybdenum in the cation position M. A systematic investigation of the effect of the annealing temperature in the range from 650 to 800 °C, and for a time of up to 1344 hours, on the evolution of the microstructure and the phase composition of carbide precipitates was performed by SEM and AES. Copyright © 2004 John Wiley & Sons, Ltd.