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- W2372004658 abstract "The microstructure of functionally graded WC-Co cemented carbide with dual phase structure prepared by so-called two-step technique was observed by metallography. Vickers hardness (HV2) along the gradient was tested by micro-hardness tester. The results show that the η phase in the core zone is in dispersion-distributed state, locating between WC and WC particles, and between WC particle and the binder with an average grain size less than that of WC. Because of the existence of fine η phase, most of the WC grains in the core zone loss their multi-angle character, taking a rounded appearance. During the carbonization process of the as-sintered cemented carbide with η phase in the whole body, part of cobalt in the surface zone migrates towards the inner of the alloy under the driving force of carbon-activity difference, with the formation of cobalt gradient structure and the microstructure change of the surface zone and the intermediate zone from the original WC+γ+η into WC+γ, accompanied by the remarked decrease of very small WC grains and the increase of uniformity degree of WC grains. Vickers hardness (HV2) along the gradient changes regularly from high to low, then from low to high, corresponding to the microstructure change in the alloy." @default.
- W2372004658 created "2016-06-24" @default.
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- W2372004658 date "2005-01-01" @default.
- W2372004658 modified "2023-09-25" @default.
- W2372004658 title "Microstructure and Vickers hardness of functionally graded WC-Co cemented carbide with dual phase structure" @default.
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