Original title:
CARBON DIFFUSION IN CARBON-SUPERSATURATED 9CR-1MO STEEL: ANOMALOUS TEMPERATURE DEPENDENCE OF CARBON DIFFUSIVITY
Authors:
Čermák, Jiří ; Král, Lubomír Document type: Papers Conference/Event: Metal 2014. International Conference on Metallurgy and Materials /23./, Brno (CZ), 2014-05-21 / 2014-05-23
Year:
2014
Language:
eng Abstract:
Carbon diffusion was studied in temperature interval 573 - 1073 K in carbon-supersaturated surface layer of 9Cr–1Mo steel P91 and in model Fe-15Cr binary alloy. Extremely low carbon diffusion coefficient D (by 3 orders of magnitude lower than the value D eq in material with equilibrium carbon concentration) was observed in carburized surface region of Fe-15Cr. Similar results were obtained for P91 above the temperature T n ~ 800 K. However, below T n , the values of D measured in P91 increased and approached the value of D eq . It seems that the non-Arrhenius behaviour of P91 steel around T n may be ascribed to the α → α + α’ phase decomposition. Possible effect of nitrogen upon the low-temperature increase in D in P91 steel was excluded.
Keywords:
Carbon; Carbon-supersaturation; Cr-Mo steels; Diffusion; phase decomposition Project no.: GAP108/11/0148 (CEP), ED1.1.00/02.0068 Funding provider: GA ČR, GA MŠk Host item entry: METAL 2014: 23rd International Conference on Metallurgy and Materials, ISBN 978-80-87294-52-9 Note: Související webová stránka: http://www.metal2014.com/cz/zobrazit-seznam-prispevku/2498-carbon-diffusion-in-carbon-supersaturated-9cr-1mo-steel-anomalous-temperature-dependence-of-carbon-diffusivity/
Institution: Institute of Physics of Materials AS ČR
(web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences. Original record: http://hdl.handle.net/11104/0236593