Phase Stability of the Fe‐Cr‐Mn System and the Problem of Development of Stainless Steels on its Basis
- Conference date: 22-26 September 2003
- Location: Anchorage, Alaska (USA)
The Fe‐Cr‐Mn system with 2 – 15 % Cr and 20 – 50 % Mn, ⩽ 0.03 % C, ⩽ 0.05 % N was investigated after quenching from 1273 K and after quenching and subsequent one‐hour tempering at 973 K.
Phase diagrams are plotted for the Fe‐Cr‐Mn alloys after cooling and deformation at 20 K. Also, the diagrams of their mechanical properties are constructed.
A closed, earlier unknown region of concentrations has been revealed, where the alloys have extraordinarily high plasticity and impact strength at 20 K exceeding the corresponding room temperature values. The analysis of the diagrams shows that the high plasticity is due both to the martensitic transformation and to the pre‐martensite state. To improve the anticorrosive effect in cryogenic and special engineering applications, it is reasonable to use alloys containing Cr up to 14 % and Mn up to 24 – 30 %. Such alloys have quite high plasticity and strength.
- Materials quenching
- Martensitic phase transitions
- Mechanical properties
- Phase diagrams
- Phase stability
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