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Glass-formation and corrosion properties of Fe-Cr-Mo-C-B glassy ribbons with low Cr content
Madinehei, Seyed Milad; Bruna Escuer, Pere; Duarte Correa, Maria Jamin; Pineda Soler, Eloi; Klemm, Julia; Renner, Frank U.
Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
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.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Metallic glasses
Light metal alloys
Amorphous alloys
Glass forming ability
Vidres metàl·lics
Aliatges lleugers
Attribution-NonCommercial-NoDerivs 3.0 Spain

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