Potentials of nanostructured WC-Co hardmetal as reference material for Vickers hardness

Aleksandrov Fabijanić, Tamara and Alar, Željko and Pötschke, Johannes (2014) Potentials of nanostructured WC-Co hardmetal as reference material for Vickers hardness. = Potentials of nanostructured WC-Co hardmetal as reference material for Vickers hardness. International Journal of Refractory Metals and Hard Materials, 50. pp. 126-132. ISSN 0263-4368. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2013). Točan broj autora: 3.

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Abstract

The potential of nanostructured WC-Co hardmetal as reference material for Vickers hardness was researched in this paper. Preliminary reference Vickers hardness blocks were developed from a WC 9-Co mixture. The WC powder used was nanoscaled and had a grain size of 150 nm and a specific surface area of 2.5 m2/g. Hardness blocks were consolidated using the Sinter-HIP process. Properties of the sintered material were obtained by using standard measurement techniques like magnetic properties or the SEM analysis of microstructure. Special emphasis was placed on hardness uniformity of the test surface as it is the most important property placed on reference hardness blocks. Hardness uniformity was tested by analysis of variance, ANOVA, for single factor in order to determine if significant hardness variations across the block surface were present. From the conducted research it was concluded that hardness distribution over the whole test surface was uniform. The achieved superior properties of the material, such as full densification, nanosized homogeneous microstructure, high hardness and good fracture toughness, influenced the metrological characteristics of the reference Vickers hardness block. Hardness non-uniformity is nearly two times lower when compared to commercially available standard reference material made of ultra-fine WC-Co. Material response does not involve chipping, cracking or any other imperfections. The research opens a new area of application for nanostructured WC-Co hardmetals as reference material for Vickers hardness for high hardness range. © 2014 Elsevier Ltd. All rights reserved.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): Fracture toughness; Microstructure; Sintering; Tungsten alloys; Tungsten carbide; Hard metals; Hardness distribution; Hardness uniformity; Homogeneous microstructure; Metrological characteristics; Reference material; Standard measurements; Standard reference material; Vickers hardness
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1000 Department of Materials > 1010 Chair of Materials and Tribology
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Citations JCR: 0 (3.6.2015.)
Quartiles: Q1 (2013)
Citations SCOPUS: 0 (3.6.2015.)
Date Deposited: 03 Jun 2015 07:25
Last Modified: 03 Jun 2015 07:25
URI: http://repozitorij.fsb.hr/id/eprint/4199

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