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Journal of Materials Science

, Volume 41, Issue 15, pp 4948–4960 | Cite as

Formation of boride layers at the Fe–25% Cr alloy–boron interface

  • V. I. Dybkov
  • W. Lengauer
  • P. Gas
Article

Abstract

Two boride layers based on the FeB and Fe2B compounds are formed at the interface between a Fe–25% Cr alloy and boron at 850–950 °C and reaction times up to 12 h. The characteristic feature of both layers is a pronounced texture. Each of two boride layers is compositionally two-phase. The outer layer consists of the (Fe,Cr)B and (Cr,Fe)B phases. The inner layer comprises the (Fe,Cr)2B and (Cr,Fe)2B phases. The diffusional layer-growth kinetics are close to parabolic and can alternatively be described by a system of two non-linear differential equations, also producing a fairly good fit to the experimental data. Annealing of a borided Fe–Cr sample in the absence of boriding media results in the disappearance of the (Fe,Cr)B–(Cr,Fe)B layer, with the (Fe,Cr)B phase disappearing first. Microhardness values are 21.0 GPa for the outer layer, 18.0 GPa for the inner layer and 1.35 GPa for the alloy base. The abrasive wear resistance of the (Fe,Cr)B–(Cr,Fe)B layer, found from mass loss measurements, is more than 150 times greater than that of the alloy base.

Keywords

Alloy Base Boride Layer Abrasive Wear Resistance Boride Phase KBF4 

Notes

Acknowledgments

This investigation was supported in part by the STCU grant No. 2028. The authors thank V.G. Khoruzha, V.R. Sidorko, K.A. Meleshevich and A.V. Samelyuk for their help in conducting the experiments and carrying out the necessary analyses.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.Department of Physical Chemistry of Inorganic MaterialsInstitute for Problems of Materials ScienceKyivUkraine
  2. 2.Institute for Chemical Technologies and AnalyticsVienna University of TechnologyViennaAustria
  3. 3.L2MP-CNRS, Faculté des Sciences St JeromeMarseilleFrance

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