Conclusions
The level and nature of variation of impact toughness in the iron-manganese powder alloys are similar to the vacuum-melted cast alloys. The lowest cold brittleness threshold was recorded for the alloys with 20–23% Mn (determined at −253°C) containing the maximum amount of ɛ-martensite and positioned at the boundary of the α + ɛ + γ and ɛ + γ regions. Brittle fracture in these alloys takes place by the intercrystalline mechanism, and the inclusions, depending on their composition, size, and distribution, can both support crack propagation and delay this process. The possible mechanisms of failure of the powder materials are proposed on the basis of the literature data and own experimental investigations.
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Translated from Poroshkovaya Metallurgiya, No. 12(300), pp. 77–83, December, 1987.
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Volynova, T.F., Medov, I.B. & Sidorova, I.B. Cold shortness and nature of failure of iron-manganese powder alloys. Powder Metall Met Ceram 26, 1016–1021 (1987). https://doi.org/10.1007/BF00797793
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DOI: https://doi.org/10.1007/BF00797793