Strength characteristics of the materials obtained by hot forging of porous powder preforms. II. Effect of heat treatment on the tensile and shear strength and the compressive yield stress |
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Authors: | Yu. G. Dorofeev G. A. Dreev |
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Affiliation: | (1) Novocherkassk Polytechnic Institute, USSR;(2) Rostsel' mash Factory, USSR |
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Abstract: | Conclusions Annealing of the powder metallurgy steels leads to a reduction in the values of the parameters t, , and c0.2. During this process, they become lower than those of the hot rolled (worked) products. However, after annealing, the stability of all the three characteristics increases. Quenching followed by a low-temperature tempering improves the parameters t, , and c0.2, but in this case, brittleness of the material increases. With increasing tempering temperature, all the three parameters decrease and at 600°C, they are virtually at the same level as that obtained after annealing at this temperature.The change in the yield stress after quenching and tempering or after annealing determines to a significant extent the nature (whether brittle or ductile) of shear fracture.Translated from Poroshkovaya Metallurgiya, No. 4(280), pp. 73–75, April, 1986. |
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