Abstract
The fractional composition of gas-atomized high-speed steel R6M5K5 is studied for its effect on the main features of activated sintering of compacts. A mixture consisting of nickel powder and 30% (wt.) boron is used as an activating addition. It is established that a reduction in average particle size increases shrinkage after sintering, but the dependence of compact shrinkage on fractional composition is different for monodispersed and polydispersed compositions. The maximum size of powder particles for polydispersed compositions has little effect on shrinkage, whereas in the case of monodispersed mixtures there is a marked increase in compact density after sintering with a reduction in particle size. There is a marked increase in density providing closed porosity (90–93%) with a sintering temperature of 1200‡C, whereas in order to achieve a similar density in the mixture without activator the sintering temperature should be at least 1230‡C.
Similar content being viewed by others
Literature cited
M. T. Podob and L. K. Woods, “The mechanism of sintering high speed steel to full density,” Modern Developments in Powder Metallurgy, Princeton,13, 71–92 (1981).
S. S. Kiparisov, V. I. Tret'yakov, V. S. Panov, et al., “Properties of steel R6M5 powders with different grain size and sintered steel structure,” Poroshk. Metall., No. 6, 9–15 (1982).
O. V. Padalko, “Sintered high-speed steels,” in: Results of Science and Technology. Powder Metallurgy Series, Vol. 1 [in Russian], VINITI, Moscow (1983).
L. G. Marinenko and M. K. Bateneva, “Preparation of high-speed steel R18 from atomized powders by dynamic hot pressing,” Trudy Novocherkassk. Politekhn. Inst., No. 265, 32–34 (1972).
G. A. Baglyuk, S. N. Kaplya, L. A. Poznyak, et al., “Activated sintering for gasatomized high-speed steel powder,” in: VI Repub. Sem. “Development and production and use of tool materials,” Pro. (Zaporozhe, 16–18 October Institute of Materials Science Problems, Ukrainian Academy of Sciences, Kiev (1990).
B. A. Baglyuk, G. E. Mazharova, S. N. Kaplya, et al., “Pressing of blanks of gasatomized high-speed steel powders,” Poroshk. Metall., No. 7, 9–12 (1990).
V. A. Ivensen, Phenomenology of Sintering [in Russian], Metallurgiya, Moscow (1985).
N. P. Lyakishev, Yu. L. Pliner, and S. I. Lapko, Boron-Containing Steels and Alloys [in Russian], Metallurgiya, Moscow (1986).
Author information
Authors and Affiliations
Additional information
Translated from Poroshkovaya Metallurgiya, No. 10, pp. 15–20, October, 1992.
Rights and permissions
About this article
Cite this article
Baglyuk, G.A., Kaplya, S.N., Poznyak, L.A. et al. Effect of charge fractional composition on high-speed steel powder sintering. Powder Metall Met Ceram 31, 831–834 (1992). https://doi.org/10.1007/BF00797500
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00797500