High-strength non-magnetic alloys based on Fe-Mn

• Valentin A. Dotsenko. Vladivostok State University. Vladivostok. Russia

• Belous I.A.

  Igor A. Belous. Vladivostok State University. Vladivostok. Russia

Abstract. The strength properties of Fe-Mn (20–25 %) alloys additionally alloyed with silicon, cobalt, niobium and carbon have been studied. It is shown that by combined methods of hardening (aging, TMT (thermomechanical treatment)) it is possible to obtain high strength properties in these alloys with satisfactory plasticity and preservation of their non-magnetic properties. The highest strength properties at an elongation of 20–25 % after annealing at 950 °C are achieved in alloys containing 20–23 % manganese and additionally alloyed with ≈2 % Si. The implementation of the γ → ε transformation under the process of deformation at room temperature (the amount of ε-phase reaches ap-
proximately 75 %) is responsible for the higher hardenability of the alloys.

Keywords: combined alloying; unstable, non-magnetic steels; strength, plasticity.