Conclusions
Deformation of EP-741P heat-resisting alloy at a temperature of 750‡C occurs mainly through a shear mechanism, involving the formation of a succession of slip bands and also intergranular slip. Its fracture has a dual character, the crack passing both through powder particles and along their boundaries. Raising the oxygen content of a material produced from an atomized powder above 0.01% increases the proportion of deformation along original powder particle boundaries. The particles themselves experience no bulk plastic deformation. The fracture of such a material takes place chiefly along powder particle boundaries, at low levels of stress, local strain, and work of rupture, and with a high degree of sensitivity to stress raisers.
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A. F. Belov, N. F. Anoshkin, V. I. Khodkin, O. Kh. Fatkullin, and M. S. Ermanok, Processing of Light and Heat-Besisting Alloys [in Russian], Nauka, Moscow (1976).
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M. G. Lozinskii, Thermal Microscopy of Materials [in Russian], Metallurgiya, Moscow (1976).
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Translated from Poroshkovaya Metallurgiya, No. 6(222), pp. 54–59, June, 1981.
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Ezhov, A.A., Shvarts, V.I., Popova, L.E. et al. Investigation of the fracture behavior of EP-741P heat-besisting alloy by thermal microscopy. Powder Metall Met Ceram 20, 407–411 (1981). https://doi.org/10.1007/BF00815788
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DOI: https://doi.org/10.1007/BF00815788