Glass-formation and corrosion properties of Fe-Cr-Mo-C-B glassy ribbons with low Cr content

JOURNAL OF ALLOYS AND COMPOUNDS

卷:615

Article; Proceedings Paper

Madinehei, M.¹  Bruna, P.¹  Duarte, M. J.²  Pineda, E.³  Klemm, J.²  Renner, F. U.^2,4 

[1] Univ Politecn Cataluna, BarcelonaTech, Dept Fis Aplicada, EPSC, Castelldefels 08860, Spain

[2] Max Planck Inst Eisenforsch GmbH, Dept Interface Chem & Surface Engn, D-40237 Dusseldorf, Germany

[3] Univ Politecn Cataluna, BarcelonaTech, Dept Fis & Engn Nucl, ESAB, Castelldefels 08860, Spain

[4] Hasselt Univ, Inst Mat Res IMO, B-63590 Diepenbeek, Belgium

关键词: Fe-based;    Amorphous alloys;    Glass forming ability;    Corrosion;   

DOI  :  10.1016/j.jallcom.2013.12.245

来源: Elsevier

【 摘 要 】

The effect of low amounts of Cr on glass forming ability and corrosion behavior of Fe(65-x)CrxMo14C15B6 (x = 0, 2, 4, 6, 8,10 at.%) ribbons have been studied. It was found that the reduced glass transition temperature (T-rg) do not change significantly with Cr content. The glass forming ability (GFA) of this system is evaluated by the gamma(m), delta and omega parameters and the alloys containing 4 and 6 at.% were found to be the best glass formers in this system. The temperature interval of the supercooled liquid region (Delta T-x) changed with Cr and was enlarged from 35 K at x = 0 to 50 K at x = 4. Corrosion rates measured by immersion tests in H2SO4 decreased with an increase of chromium content in the alloys. The electrochemical measurements indicate that the alloys containing more than 4 at.% of Cr are spontaneously passivated with low current densities in 0.1 N H2SO4 whereas the alloys with Cr content <4 at.% showed transpassive Mo dissolution. In view of these results, the optimal amount of Cr addition in Fe-Mo-C-B amorphous steels is discussed. (C) 2014 Elsevier B.V. All rights reserved.

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