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Vanadium Additions to a High-Cr White Iron and its Effects on the Abrasive Wear Behavior.

Published online by Cambridge University Press:  16 November 2020

Alexeis Sánchez ,
Arnoldo Bedolla-Jacuinde ,
Francisco V. Guerra  and
I. Mejía
Alexeis Sánchez
Affiliation:
Instituto de Investigaciones en Metalurgia y Materiales, Universidad michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México.
Arnoldo Bedolla-Jacuinde*
Affiliation:
Instituto de Investigaciones en Metalurgia y Materiales, Universidad michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México.
Francisco V. Guerra
Affiliation:
Instituto de Investigaciones en Metalurgia y Materiales, Universidad michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México.
I. Mejía
Affiliation:
Instituto de Investigaciones en Metalurgia y Materiales, Universidad michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México.
*
*Corresponding author: [email protected]
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Abstract

From the present study, vanadium additions up to 6.4% were added to a 14%Cr-3%C white iron, and the effect on the microstructure, hardness and abrasive wear were analysed. The experimental irons were melted in an open induction furnace and cast into sand moulds to obtain bars of 18, 25, and 37 mm thickness. The alloys were characterized by optical and electronic microscopy, and X-ray diffraction. Bulk hardness was measured in the as-cast conditions and after a destabilization heat treatment at 900°C for 45 min. Abrasive wear resistance tests were undertaken for the different irons according to the ASTM G65 standard in both as-cast and heat-treated conditions under a load of 60 N for 1500 m. The results show that, vanadium additions caused a decrease in the carbon content in the alloy and that some carbon is also consumed by forming primary vanadium carbides; thus, decreasing the eutectic M7C3 carbide volume fraction (CVF) from 30% for the base iron to 20% for the iron with 6.4%V;but overall CVF content (M7C3 + VC) is constant at 30%. Wear behaviour was better for the heat-treated alloys and mainly for the 6.4%V iron. Such a behaviour is discussed in terms of the CVF, the amount of vanadium carbides, the amount of martensite/austenite in matrix and the amount of secondary carbides precipitated during the destabilization heat treatment.

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Articles
Information
MRS Advances , Volume 5 , Issue 59-60: International Materials Research Congress XXIX , 2020 , pp. 3077 - 3089
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Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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