J. Phys. IV France 112 (2003) 279
DOI: 10.1051/jp4:2003883

Investigation of structural stability, physical and mechanical properties of nitrogen-free and nitrogen-containing austenitic alloys of the Fe-Cr-Mn system at low temperatures

G. Grikurov¹, I. Baratashvili¹, L. Skibina², M. Chernik², N. Antropov³ and K. Yushchenko<sup>4

1</sup>  Institute of Metallurgy, Academy of Sciences of Georgia, 15 Al. Kazbegi Ave., Tbilisi 380113, Georgia
²  B. Verkin Institute for Low Temperature Physics & Engineering, 47 Lenin Ave., Kharkov 61103, Ukraine
³  Russian Scientific Center for Applied Chemistry, 14 Dobrolubova Ave., St. Petersburg 197198, Russia
⁴  E.0. Paton Electric Welding Institute, NASU, 11 Bozhenko Str., 252650 Kiev-5, Ukraine

Abstract
The mechanical characteristics of the Fe-Cr-Mn and Fe-Cr-Mn-0.15 N systems have been studied at 77 K (for 20 - 50 % Mn and 0 - 15 % Cr). The phase diagrams of these alloys were plotted on cooling to 77 K and after deformation at this temperature. As the comparative analysis shows, in the 0.15 N alloys, the relative elongation, compression and impact strength decrease with a simultaneous increase in the yield strength and ultimate strength. In the N ₂ - containing alloys the stability of -phase becomes stronger.

© EDP Sciences 2003