Summary
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1.
The mean grain size of cast nickel is 13 times greater than that of sintered nickel. There is no significant difference between the grain size uniformity of cast and sintered nickel.
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2.
The grain strength uniformity of cast nickel is much greater than that of sintered nickel. The grain strength uniformity of sintered nickel increases substantially after annealing and attains the level of the grain strength uniformity of cast nickel.
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3.
The microhardness distribution of sintered and cast nickel obeys Gauss' law. The annealing of sintered nickel for 2 h at 1373°K and cooling at 373 deg K/h lowers its microhardness by 35%. This is not accompanied by a significant change of grain size.
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Literature cited
G. S. Pisarenko et al., The Strength of Sintered Materials and Alloys at Normal and High Temperatures [in Russian], Kiev, Acad. Sci. UkrSSR Press (1962).
V. S. Rakovskii and V. V. Saklinskii, Powder Metallurgy in Engineering [in Russian], Moscow, Mashgiz (1956).
I. M. Fedorchenko and R. A. Andrievskii, Principles of Powder Metallurgy [in Russian], Kiev, Acad. Sci. UkrSSR Press (1961).
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German, E.N., Kozlova, L.M. The heterogeneity of sintered materials. Powder Metall Met Ceram 4, 460–462 (1965). https://doi.org/10.1007/BF00773966
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DOI: https://doi.org/10.1007/BF00773966