Conclusions
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1.
The addition of cobalt to maraging Fe-Co-W and Fe-Co-Mo alloys broadens the γ region at high temperatures, which permits the γ→α transformation by the martensite mechanism during subsequent conling.
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2.
The high density of dislocations and other defects that result from the displacement mechanism of the γ»α transformation leads not only to hardening of the matrix but also creates conditions favorable for the formation of large numbers of centers for precipitation of phases during aging.
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3.
Cobalt substantially accelerates the aging process. The initial stage of aging is slowed down in alloy V10, but there is no incubation period in alloys V10K10 and V10K15, which may indicate a small effect of activation barriers determining the formation of precipitates on dislocation.
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Literature cited
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A. F. Edneral, O. P. Zhukov, and M. D. Perkas, “Effect of cobalt on hardening of martensite in Fe-Ni-Co-W alloys during aging”, Fiz. Metal. Metal., 3, 569–573 (1973).
A. F. Edneral, O. P. Zhukov and M. D. Perkas, “Structural changes during aging of martensite in Fe-Ni-W and Fe-Ni-Co-W alloys”, Fiz. Metal. Metal.,36, 2, 339–346 (1973).
A. F. Edneral, O. P. Zhukov and M. D. Perkas, “Effect of cobalt on solubility of molybdenum in Fe-Ni martensite”, Dokl. Akad. Nauk SSSR,184, 4, 828–830 (1969).
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Additional information
Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 24–28, October, 1974.
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Edneral, A.F., Zhukov, O.P. & Perkas, M.D. Effect of cobalt on aging of martensite and ferrite in Fe-Co-W and Fe-Co-Mo alloys. Met Sci Heat Treat 16, 840–843 (1974). https://doi.org/10.1007/BF00664248
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DOI: https://doi.org/10.1007/BF00664248