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Efros, Nataly
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document
Destabilization of fcc stable materials during SPD under high pressure
Abstract
<p>It was shown that of a fine α-phase was formed in the Hadfield steel after a cold plastic deformation to E = 50%. Nuclei of the ex-phase of deformed samples reduced the decomposition start temperature of the austenite by 180°C. Fine crystals of an α-phase nearly 30 nm in size, whose concentration was as high as ∼2.3%, were detected in a steel Fe <sub>79.55</sub>Mn<sub>17</sub>Al<sub>3</sub>Co<sub>0.45</sub> after a SPD to ε = 92%. A steel Fe<sub>61.2</sub>Cr<sub>18</sub>Mn<sub>20</sub>N <sub>0.7</sub>C<sub>0.1</sub> contained fine crystals of a strain-induced α-phase 20 nm in size after a low temperature plastic deformation. The α-phase, which was formed under the given conditions, had an extremely low Curie temperature T<sub>C</sub> = 400°C. When the steel was strongly deformed (e ≈ 8) by SPD a strain-induced α-phase have a normal Curie temperature T<sub>C</sub> = 600°C. Thus, the obtained results indicate that SPD can result in a considerable destabilization of stable austenitic steels.</p>