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Effect of oxygen and microporosity on some properties of a sintered high-speed steel

  • Powder Metallurgical Materials, Parts, and Coatings
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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

An investigation was carried out into the microstructure and mechanical and operating properties of R6M5K5-MP high-speed steel produced from atomized powders with oxygen contents in the range 0.014–0.074%. Use of a powder containing more than 0.02% oxygen was found to have a pronounced deleterious effect on the quality of the sintered high-speed steel: Thick oxide films appeared in its microstructure at powder particle boundaries, and the impact strength of the metal and useful tool life decreased by factors of ∼1.6 and ∼1.5, respectively. In view of this, the maximum permissible oxygen content of this sintered high-speed steel may be taken to be 0.02 wt.%. The presence of even a minute quantity of argon in a capsule with powder led to the appearance of micropores (about 100 micropores in a 100-mm2 microsection area) in the resultant sintered high-speed steel, which shortened the useful life of tools made of this steel by a half compared with the nonporous steel. A larger argon content increased the amount of micropores and decreased useful tool life still further. The data obtained show that the presence of micropores in a sintered high-speed steel cannot be tolerated. The conditions for obtaining a nonporous steel from an atomized powder by HIP are an optimum capsule design and strong, gastight welds preventing argon from penetrating into the capsule with powder during pressing.

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Literature cited

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Authors and Affiliations

  1. Ukrainian Scientific-Research Institute of Special Steels, USSR

    G. I. Parabina, O. M. Kirillova, A. F. Palamarchuk & V. T. Zubkova

Authors
  1. G. I. Parabina
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  2. O. M. Kirillova
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  3. A. F. Palamarchuk
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  4. V. T. Zubkova
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Translated from Poroshkovaya Metallurgiya, No. 5(209), pp. 61–64, May, 1980.

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Parabina, G.I., Kirillova, O.M., Palamarchuk, A.F. et al. Effect of oxygen and microporosity on some properties of a sintered high-speed steel. Powder Metall Met Ceram 19, 341–344 (1980). https://doi.org/10.1007/BF00791559

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  • DOI: https://doi.org/10.1007/BF00791559

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