The hardening of metastable austenitic alloys by plastic deformation and ageing is accompanied by the martensitic transformation. It has been shown that the high hydrostatic pressure suppresses the development of (-( transformation, since the process occurs with the increase of volume. High pressure decreases the temperatures of direct (-( and reverse (-( martensitic transformations.
It is shown that the deformation under high pressure prevents the martensite formation practically in all the investigated alloys Fe-Ni-Ti (24-30%Ni) if it is brought about at temperatures higher than point Ms. Under the high hydrostatic pressure the Md point is also displaced towards the low temperatures. The pressure dependence of Md temperature is of the linear character.
Substitution of the expensive nickel for nitrogen stabilizes the austenite effectively. The alloying of the Cr-Mn steels with nitrogen to 1% provides the obtaining of completely austenitic structure till the liquid nitrogen temperature. Under the plastic deformation of high-nitrogen steels under the high pressure conditions a disperse twin structure is formed. It hardens the steels essentially with the high level of plasticity ((?=2000MPa, (=10%, (=50%)being preserved.

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1. The Treatment of High-Nitrogen Austenitic Steels by High Hydrostatic Pressure