Conclusions
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1.
In alloys YuNDK and YuNDKT cooled from the two-phase region at rates of 50–100 deg/min the αγ has a martensitic structure. This confirms the assumption of a diffusionless mechanism of the γ→αγ transformation. At cooling rates considerably lower than 50–100 deg/min and during isothermal holding in a temperature range near the lower limit of the two-phase region the diffusional γ→α transformation is possible.
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2.
In alloy YuNDK24 the rate of the diffusional transformation is highest at 740°C; in this case it is completed in 3 h. In alloys YuNDK35T5 and YuNDK40T7 only the partial diffusional γ→α transformation occurs. The rate of the transformation is highest at 780°C.
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Literature cited
E. Planchard, R. Meyer, and G. Bronner, Z. Angew. Phys.,17, 3, 175–176 (1964).
M. D. Perkas and V. M. Kordonskii, High-Strength Maraging Steels [in Russian], Metallurgiya, Moscow (1970), p. 15.
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 52–55, December, 1974.
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Leshchinskaya, R.P. Structure of αγ phase in alloys of the YuNDK and YuNDKT type. Met Sci Heat Treat 16, 1060–1062 (1974). https://doi.org/10.1007/BF00664053
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DOI: https://doi.org/10.1007/BF00664053