Conclusions
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1.
The velocity of propagation of ultrasonic vibrations can be used as a measure of the strength of as-sintered and plastically worked porous metals.
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2.
The strength of re-pressed specimens only slightly exceeds that of specimens of the same density produced by single pressing and sintering. This is due to the simultaneous manifestation of a strengthening induced by the work-hardening of the material during plastic working and a strength loss caused by the presence of macroscopical crevice-like defects.
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3.
By measuring the velocity of propagation of USV it is possible to calculate the strength of an unworkhardened material having the same structure as a worked porous material.
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Translated from Poroshkovaya Metallurgiya, No. 1(157), pp. 83–87, January, 1976.
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Skorokhod, V.V., Kutser, M.Y. & Fridman, G.R. Correlation between the strength and acoustic properties of volume-strained porous iron. Powder Metall Met Ceram 15, 67–70 (1976). https://doi.org/10.1007/BF00792414
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DOI: https://doi.org/10.1007/BF00792414