Fracture pattern of stainless Cr-Mn-N steel with nanostructured surface layers at cryogenic temperature
N.А. Narkevich1, I.V. Vlasov1, Yu.F. Gomorova1, M.S. Syrtanov2, A.I. Tolmachev1, M.N. Volochaev3
1Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, Russia
2Tomsk Polytechnic University, Tomsk, Russia
3Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: natnark@list.ru

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Effect of deformation treatment of the surface of stainless austenitic Cr-Mn-N steel on its structure, mechanical properties and fracture behavior at -196oC has been studied. Structure refinement, decrease in the lattice parameter of austenite and strain aging with the formation of CrN and Fe2N particles occurs during processing in the near-surface layer. After processing, the steel has an increased yield strength and work hardening, but reduced ductility and toughness compared to the quenched state. Dimple fracture of near-surface layers is facilitated by a decrease in internal stresses associated with the release of nitrogen from interstitial positions and the formation of nitrides. Keywords: high nitrogen steel, austenite, ultrasonic forging strain, nanostructure, tension, impact bending, plasticity, fracture toughness, fracture.
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