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Structure of M6C carbide in cast high-speed steels of the Fe-Mo-C system

  • Tool Steels
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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The lamellar crystals of carbide (Fe, Mo)6C formed during slow solidification (as low as 2 deg/min) of Fe-Mo-C alloys (30–40% Mo and 1.5–1.7% C) are rotation twins (twins along [111]).

  2. 2.

    In the transition zone — the area of mating of the components of the η twin — the regular alternation of the double layers of the structural elements (octahedron — octahedron, tetrahedron — tetrahedron) is disrupted, which leads to stacking faults.

  3. 3.

    After special etching, the area of the stacking fault is clearly revealed in metallographic analysis as planar boundaries dividing the crystals.

  4. 4.

    The fitting of the twin components in the process of growth is accompanied by substantial elastic stresses that induce cracks in twinned η crystals.

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Authors
  1. Yu. N. Taran
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  2. A. M. Nesterenko
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Additional information

Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 49–53, November, 1977.

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Taran, Y.N., Nesterenko, A.M. Structure of M6C carbide in cast high-speed steels of the Fe-Mo-C system. Met Sci Heat Treat 19, 970–973 (1977). https://doi.org/10.1007/BF00670169

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  • DOI: https://doi.org/10.1007/BF00670169

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