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Abstract
The application of the multifractal parameterization method for comparing structural changes observed in an optical microscope on steel St.3 subjected to severe plastic deformation and high-rate superplastic deformation is investigated.
Highlights
In recent years, the attention of many researchers has been focused on the features of processes under conditions of extreme deformation, which has received the terms "high", "large", "intense", "megaplastic" [1 - 3]
Of no less interest is superplastic deformation associated with the problem of forming [4]
Sample 2 with initial grain size of 40 μm in the disk shape of ∅90 x 10 mm was subjected to severe plastic deformation by plane cumulative jet
Summary
The attention of many researchers has been focused on the features of processes under conditions of extreme deformation, which has received the terms "high", "large", "intense", "megaplastic" [1 - 3]. Of no less interest is superplastic deformation associated with the problem of forming [4] For both deformation types, there is a special mode, the most interesting and least studied. There is a special mode, the most interesting and least studied This mode is associated with a high strain rate (> 1 s-1), at which superplasticity should not appear at all. The modes and model of superplastic deformation at rates of 100-105 s-1 are considered in [5, 6] This was done for structural superplasticity, which manifests itself under certain conditions: - strain temperature T ~ 0.5Tm and higher (Tm - melting point); - presence ultrafine grains (dz ≤ 10 μm) in the structure, stable in the temperature range T = (0.4 - 0.6) Tm
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