Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel

  • OMAR AZOUANI Commissariat à l’Energie Atomique. Centre de Recherche Nucléaire de Draria (CRND). BP 43, Draria, Alger, Algérie
  • Mourad KEDDAM USTHB, Faculté de Génie Mécanique et Génie des Procédés, Laboratoire de Technologie des Matériaux, Département SDM, B.P. 32 El-Alia, 1611 Bab-Ezzouar, Alger, Algérie
  • A. BRAHIMI Laboratoire de Traitement de Surface et Matériaux, Département de Génie Mécanique, Université Saad Dahlab, Route De Soumaa, B.P. 270 Blida, Algérie.
  • Abdelaziz SEHISSEH Commissariat à l’Energie Atomique. Centre de Recherche Nucléaire de Draria (CRND). BP 43, Draria, Alger, Algérie

Abstract


In this work, the kinetics of formation of the boride layers (FeB/Fe2B), formed on the X200CrMoV12 steel used for the cold-working, was investigated. The boriding treatment was carried out in the powder mixture consisting of 5%B4C, 5% NaBF4 and 90% SiC.

The boriding parameters are : 900, 950 and 1000°C with treatment times of 2, 4 and 6 h. The obtained borided layers (FeB/Fe2B) were characterized by the following experimental techniques: optical microscopy, scanning electron microscopy coupled to EDS analysis and XRD analysis. The kinetics of boron diffusion in the X200CrMoV12 steel was also studied. As a result, the time dependence of the borided layers thicknesses followed a growth parabolic law. The boron activation energy was estimated as 199.37 kJ mol-1 for the X200CrMoV12 steel. A full factorial design with 2 factors at 3 levels was employed to estimate the total boride layer thickness as a function of the boriding parameters (time and temperature) and a simple equation was proposed. Finally, an iso-thickness diagram was given as a tool to predict the total boride layers thicknesses in relation with the practical utilization of this kind of steel.

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Published
2015/02/24
How to Cite
AZOUANI, O., KEDDAM, M., BRAHIMI, A., & SEHISSEH, A. (2015). Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel. Journal of Mining and Metallurgy, Section B: Metallurgy, 51(1), 49. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/5866
Issue
Vol. 51 No. 1 (2015)
Section
Original Scientific Paper

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