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The role of tungsten in the Co binder : effects on WC grain size and hcp–fcc Co in the binder phase
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Marshall, Jessica M. and Giraudel, Mathilde (2015) The role of tungsten in the Co binder : effects on WC grain size and hcp–fcc Co in the binder phase. International Journal of Refractory Metals and Hard Materials, 49 . pp. 57-66. doi:10.1016/j.ijrmhm.2014.09.028 ISSN 02634368.
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Official URL: http://dx.doi.org/10.1016/j.ijrmhm.2014.09.028
Abstract
Recent advances in microscopy techniques have made possible the quantitative examination of the Co binder phase in WC–Co cemented carbides [1]. The composition of the binder phase is of interest with respect to applications where fracture toughness and fatigue are particularly important. A previous work has observed that the hcp/fcc ratio can change with fatigue and applied stress [2].
This work is part of a wider study examining the role of Co mean free path, mean WC grain diameter (dWC) and composition on the hcp–fcc content on the Co binder phase extracted from a wide range of WC–Co samples with an average dWC of 0.6 μm < dWC < 10 μm and Co content from 6 wt.% to 25 wt.%. This paper aims to study the effect of carbon composition on three 10 wt.% Co grades with target dWC 0.8 μm < dWC < 6 μm. The concentration of W in the Co was monitored by examining the binder magnetic saturation (BMS). Samples with a variety of Co Msat values through the WC–Co pseudo-binary phase field were studied. The effects on grain size, Co distribution, physical properties and hcp content with varying W content were examined. Experimental results show that lower BMS resulting from dissolved tungsten in the binder has a negative exponential correlation with hcp abundance for grades with dWC < 1.5 μm. A significant abundance of hcp was associated with a more diffuse large scale fcc–fcc structure of the binder phase, which has been associated with improved crack deflection [14].
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | International Journal of Refractory Metals and Hard Materials | ||||||
| Publisher: | Elsevier | ||||||
| ISSN: | 02634368 | ||||||
| Official Date: | March 2015 | ||||||
| Dates: |
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| Volume: | 49 | ||||||
| Page Range: | pp. 57-66 | ||||||
| DOI: | 10.1016/j.ijrmhm.2014.09.028 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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