As object with low stacking-fault energy, determining character of
structural transformations at plastic deformation from initial
coarse-grained to final submicrocrystal (SMC) state, steel 12Kh18N10T
was chosen.
By TEM microscopy is established, that the formation of deformed SMC
structure goes through formation both the twins, large density
stacking-faults and deformation microbands, unlike the cellular
structure, the formation of which is the feature for materials with
high stacking-fault energy.
It is established, that strong plastic deformation causes the radical
changes of initial structure and results in formation of
nanocrystalline structure with the average size of crystallites 30 nm.
Measurements of microhardness of investigated 12Kh18N10T steel samples
have shown, that the hardening increase 2 - 2,5 times (~ 4500 MPa) in
comparison with the initial state. And, the factor of deformed
hardening is maximum at initial stages of deformation and falls up to
zero after the formation of nanostructure.
The application of such extremely strong influence as shear under
pressure allows not only to achieve almost complete reorganization of
initial fcc -lattice of austenite 12Kh18N10T steel in hcp -e phase,
but also to stabilize this state, which SMC-structure has inherited at
the last stages of deformation under high pressure.

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