Technical Physics Letters
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- 2022
Phase Transformations in Stainless Cr-Mn-N Steel Activated by Nanostructuring Surface Treatment and Their Influence on Deformation Behavior and Fracture at Cryogenic Temperatures
Narkevich N. A.
1, Deryugin E. E.
1, Vlasov I. V.
1
1Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, Russia
Email: natnark@list.ru, dee@ispms.ru, viv@ispms.ru
The structure of stainless austenitic Cr-Mn-N steel after deformation treatment of its surface by ultrasonic forging strain (UFS) has been studied. It is shown that UFS activates strain aging in the near-surface layer with the formation of CrN particles. Preliminary ultrasonic treatment of the steel surface contributes to an increase in the yield strength during tensile tests at a temperature of -196oC and provides ductile fracture of the near-surface layer. Keywords: high nitrogen steel, austenite, ultrasonic forgingstrain, strain aging, cryogenic temperature, martensitic transformation.
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