Influence of defects on strength and hardness of submicron WC-8Co-1Cr3C2 hard alloy

Zaytsev, A. V.; Михайленко, Е. А.

doi:10.1016/j.phpro.2012.01.019

Cited by 6 publications

(1 citation statement)

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“…In the review of García et al [57], it is shown that for 7.5 wt.% cobalt, the Vickers hardness varies between 1400 and 1800 HV 30 depending on the grain size (5-1 µm). Moreover, the literature shows that non-recycled WC-7.5Co and WC-8Co have been sintered by conventional process with lower mechanical properties [59][60][61]. The results found in this paper are comprised between 1700 and 1850 HV 30 .…”

Section: Discussionmentioning

confidence: 69%

Study of the Processing of a Recycled WC–Co Powder: Can It Compete with Conventional WC–Co Powders?

Mégret

Vitry

Delaunois

2021

J. Sustain. Metall.

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Cemented carbide tools suffer from many issues due to the use of tungsten and cobalt as raw materials. Indeed, those are listed by the European Commission as “critical raw materials” since 2011 and by the US Department of Interior as “critical minerals” in 2018. To remain competitive with the conventional high-speed steels, less performant but cheaper, WC–Co tools can be recycled. In the present paper, a WC–7.5Co powder, recycled by the “Coldstream” process, has been sintered with vacuum sintering. As preliminary experiments have shown that the sinterability of the powder is low, the sintering temperature was set at 1500 °C to achieve full density. In parallel, the influence of ball milling conditions (rotation speed and milling medium) on the reactivity of the recycled powder has been studied in terms of grain size distribution, hardness, and fracture toughness. The optimized milling conditions were found to be 6 h wet milling, leading to a hardness of about 1870 HV30 and a toughness of about 10.5 MPa√m after densification. The recycled powder can thus totally compete with conventional powders, opening avenues for the recycling of cemented carbide tools. Graphical Abstract

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