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Vol.5 , No. 2, Publication Date: Apr. 16, 2019, Page: 29-34
C–Co Hard Alloy Structure&description=Results of metallographic studies of the polished surface of the WC–(Ti,W)C–Co hard alloy of the T5K10 grade after additional annealing in vacuum at 1200°C during 7 hours are presented. It is reported that in its typical fine structure with both carbide grains of WC– (Ti,W)C with dimensions up to 10 μm and Co based phase interlayers, the newly revealed inclusions have been observed with length from 10 to 80 μm and thickness of 0.5–10 μm, without regular relationship, which are distributed stochastically both solely and in ensembles, and have single or multiple endings. It was shown that treating with the chloral iron, the Murakami solution, and ion etching do not affect the contrast and topography of a surface of the new inclusions, what testifies their difference from the chemical constituents of the fine structure. Interaction was shown between the new inclusions and both a surface of the residual pores and with fine particles on their surface being in shape, sizes and contrast similar to the carbide grains of the basic alloy structure.&picture=http://www.aascit.org/aascit/decorators/img/journal/891.jpg)
| [1] | Mykola Prokopiv, Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kyiv, Ukraine. |
Results of metallographic studies of the polished surface of the WC–(Ti,W)C–Co hard alloy of the T5K10 grade after additional annealing in vacuum at 1200°C during 7 hours are presented. It is reported that in its typical fine structure with both carbide grains of WC– (Ti,W)C with dimensions up to 10 μm and Co based phase interlayers, the newly revealed inclusions have been observed with length from 10 to 80 μm and thickness of 0.5–10 μm, without regular relationship, which are distributed stochastically both solely and in ensembles, and have single or multiple endings. It was shown that treating with the chloral iron, the Murakami solution, and ion etching do not affect the contrast and topography of a surface of the new inclusions, what testifies their difference from the chemical constituents of the fine structure. Interaction was shown between the new inclusions and both a surface of the residual pores and with fine particles on their surface being in shape, sizes and contrast similar to the carbide grains of the basic alloy structure.
Keywords
Hard Alloy, Extra Elongated Inclusions, Metallographic Studies
Reference
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