WC - (Cu: AISI304) composites processed from high energy ball milled powders
authors Cardoso, JP; Puga, J; Rocha, AMF; Fernandes, CM; Senos, AMR
nationality International
journal INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
author keywords Nanopowders; Nanocomposites; Cemented carbides; Copper: Stainless steel alloys; Microstructure; Mechanical properties
keywords TUNGSTEN CARBIDE; CEMENTED CARBIDES; MICROSTRUCTURE
abstract Alternative binders to cobalt, based on stainless steel (SS, AISI304) and copper were investigated for tungsten carbide (WC) based cemented carbides. The binder content was fixed at 12 wt%, and the Cu:SS ratio varied in proportions of 0:1, 1:5, 1:2, 1:1, 1:0. High energy ball milling was applied to ensure high homogenization, nanometric particle size and mechanical alloying of binder elements in the powders' mixtures. To assess an adequate sintering route, wettability testing and constant heating rate dilatometry in vacuum were performed. The composites were analyzed in terms of their structural, microstructural and mechanical characteristics. The poor wettability of melted Cu on WC surfaces was increased by alloying it with SS and highly dense compacts could be successfully attained at reduced vacuum sintering temperatures with binders having a Cu:SS ratio equal to or lower than 1:2. The microstructures show secondary phases and significant grain coarsening during sintering, whereas the average grain size was kept in the nanometric range. The composites that attained almost full densification present high hardness, comparable to that of nanometric WC-12Co cemented carbides processed by similar routes, but lower toughness values.
publisher ELSEVIER SCI LTD
issn 0263-4368
year published 2019
volume 84
digital object identifier (doi) 10.1016/j.ijrmhm.2019.104990
web of science category Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000486133900012
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journal analysis (jcr 2019):
journal impact factor 3.407
5 year journal impact factor 3.414
category normalized journal impact factor percentile 74.963
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