ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1952
 
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proceedings
of the estonian academy of sciences
ISSN 1736-7530 (Electronic)
ISSN 1736-6046 (Print)
Impact Factor (2020): 1.045

Structure formation and characteristics of chromium carbide–iron–titanium cermets; pp. 138–143

Full article in PDF format | doi: 10.3176/proc.2016.2.09

Authors
Märt Kolnes, Jüri Pirso, Jakob Kübarsepp, Mart Viljus, Rainer Traksmaa

Abstract

Structure formation and properties of chromium carbide-based cermets with iron–titanium binder were investigated. Chromium carbide (50–70 wt%), Fe, and Ti (Fe : Ti ratio 4 : 1 as the binder phase) powders were milled in an attritor and a ball mill, compacted, and sintered at different temperatures and for different periods in vacuum. The microstructure, phase formation, and the composition of cermets were studied using XRD and EDS analysis and SEM. The results show that during the sintering of the Cr3C2–Fe–Ti composite at temperatures above 1000 °C, diffusion of chromium and carbon into the ferritic matrix and Cr3C2 recrystallization into the chromium ferrous dicarbide (Cr,Fe)23C6 and the formation of chromium solid solution in the iron matrix (Fe(Cr) take place. Titanium participates actively in the interaction process, which leads to the formation of TiC carbides even at 1200 °C. The mechanical properties (hardness, fracture toughness) and corrosion resistance in salt water were studied. Cermets sintered at lower temperature during a longer period demonstrated the best complex of mechanical properties.


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