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CARBON DIFFUSION IN CARBON-SUPERSATURATED 9CR-1MO STEEL: ANOMALOUS TEMPERATURE DEPENDENCE OF CARBON DIFFUSIVITY

1 ČERMÁK Jiří
Co-authors:
1 KRÁL Lubomír
Institution:
1 Institute of Physics of Materials, v.v.i., AS CR, CEITEC IPM, Brno, Czech Republic, EU
Conference:
23rd International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 21 - 23, 2014
Proceedings:
Proceedings 23rd International Conference on Metallurgy and Materials
Pages:
634-638
ISBN:
978-80-87294-52-9
ISSN:
2694-9296
Published:
18th June 2014
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
213 views / 94 downloads
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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 Deq in material with equilibrium carbon concentration) was observed in carburized surface region of Fe-15Cr. Similar results were obtained for P91 above the temperature Tn ~ 800 K. However, below Tn, the values of D measured in P91 increased and approached the value of Deq. It seems that the non-Arrhenius behaviour of P91 steel around Tn 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: Diffusion, Carbon, phase decomposition, Carbon-supersaturation, Cr-Mo steels

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