Influence of grain growth inhibitors and powder size on the properties of ultrafine and nanostructured cemented carbides sintered in hydrogen

Aleksandrov Fabijanić, Tamara and Jakovljević, Suzana and Franz, Mladen and Jeren, Ivan (2016) Influence of grain growth inhibitors and powder size on the properties of ultrafine and nanostructured cemented carbides sintered in hydrogen. = Influence of grain growth inhibitors and powder size on the properties of ultrafine and nanostructured cemented carbides sintered in hydrogen. Metals, 6 (9). ISSN 2075-4701. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2016). Točan broj autora: 4.

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Official URL: http://www.mdpi.com/2075-4701/6/9/198 (Open Acces...

Abstract

The influence of grain growth inhibitors and powder size on the microstructure and mechanical properties of ultrafine and nanostructured cemented carbides was researched. Three different WC powders, with an addition of different type and content of grain growth inhibitors GGIs, VC and Cr3C2 and with dBET grain sizes in the range from 95 to 150 nm were selected as starting powders. Four different mixtures with 6 and 9 wt. % Co were prepared. The consolidated samples are characterized by different microstructural and mechanical properties with respect to the characteristics of starting powders. Increased sintering temperatures led to microstructural irregularities in the form of a discontinuous WC growth, carbide agglomerates and abnormal grain growth as a consequence of coalescence via grain boundary elimination. The addition of 0.45% Cr3C2 contributed to microstructure homogeneity, reduced discontinuous and continuous grain growth, and increased Vickers hardness by approximately 70 HV and fracture toughness by approximately 0.15 MN/m3/2. The reduction of the starting powder to a real nanosize of 95 nm resulted in lower densities, and significant hardness increase, with a simultaneously small increase in fracture toughness. The consolidation of real nanopowders (dBET < 100 nm) solely by conventional sintering in hydrogen without isostatic pressing is not preferred.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): ultrafine and nanostructured cemented carbides; grain growth inhibitors; powder size; sintering temperature; microstructural characteristics; mechanical properties
Subjects: TECHNICAL SCIENCE > Metallurgy
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
Quartiles: Q1 (2016)
Date Deposited: 21 Sep 2016 13:33
Last Modified: 02 Mar 2018 16:44
URI: http://repozitorij.fsb.hr/id/eprint/6762

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