The hot deformation behavior of spray-formed 1.28C–6.4W–5Mo–4.2Cr–3.1V–8.5Co high speed steel is investigated in the 950–1100°C temperature range at a strain rates of 0.1 to 50 sec–1 and a true strain of 1.0. The activation energy for hot deformation is obtained. The relation between the flow stress and Zener–Hollomon parameter is successfully analyzed via the hyperbolic sine function under the whole range of deformation conditions. By a microstructural analysis for the breakdown of carbide networks in the temperature range and different strain rates, the size and distributing character of carbide grains are given. The appropriate ranges of deformation temperature and strain rate are provided to obtain fine spheroidal carbide particles and their uniform distribution.
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This research was financially supported by Baoshan Iron&Steel Co., LTD, China.
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Published in Poroshkovaya Metallurgiya, Vol. 56, Nos. 1–2 (513), pp. 23–33, 2017.
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Zhao, S., Fan, J., Zhang, J. et al. The Hot Deformation Behavior of Spray-Formed High Speed Steel. Powder Metall Met Ceram 56, 17–25 (2017). https://doi.org/10.1007/s11106-017-9866-8
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DOI: https://doi.org/10.1007/s11106-017-9866-8