[Kovove materialy - Metallic materials]
    Thu - April 03, 2025 - 17:27 No. of hits : 1840617 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 52 (2014), Issue 3

Extremely slow carbon diffusion in carbon-supersaturated surface of ferrite
CERMAK, J. KRAL, L.
vol. 52 (2014), no. 3, pp. 125 - 133
DOI: 10.4149/km_2014_3_125

Abstract
Carbon diffusion was studied in carbon-supersaturated surface layer of commercial ferrite-martensite Cr-Mo steel P91 and in two model ferrite materials: in pure α-Fe, and in ferrite Fe-Cr alloy. The carbon surface layer, the thickness of which was about 40 nm, was physical-vapor-deposited and isothermal diffusion anneals were carried out at selected temperatures between 573 K and 1073 K. The depth profiles of carbon were measured by SIMS. It was found that the carbon diffusion proceeded much more slowly in carbon-supersaturated surfaces than in matrices with equilibrium carbon concentration. The carbon diffusion coefficients obtained, D, were close to literature values reported for C diffusion in carbide phase. Measured values of D in pure α-Fe, α-Fe-Cr and P91 steel above 773 K were identical. However, significantly higher values of D were measured in P91 below the temperature of 773 K, which was ascribed to different mobility of substitution elements.

Key words
carbon diffusion, carbon supersaturation, surface, diffusion barrier, ferrite, P91

[open article.pdf] Full text (264 KB)

[IMMS SAS]      UMMS SAV - Bratislava (SK) Personal data Protection   ver. 1.8.0      [go to HOME PAGE]
Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


Article abstracts updated: 2025-01-10 11:00      
Articles in press revised: 2025-03-13 12:08     
Full text pdf uploaded: 2024-12-11 14:07    
Information updated: 2023-04-19 16:14   
Code last revised: 2024-03-06 11:13  

© OldSoft, 2004, …, 2025