Structure, Mechanical Properties, and Fracture Behavior of a Fe-Cr-V Alloy Doped with Nitrogen by High-Temperature Gas-Phase Nitriding

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2015-12, Vol.46 (12), p.5864-5870
• Main Authors: Nikulin, Sergey A., Khatkevich, Vladimir M., Rogachev, Stanislav O., Denisenko, Kristina S.
• Format: Article
• Language: English
• Subjects: Alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion resistance; Ferrite; Fractures; Materials Science; Mechanical properties; Metallic Materials; Metallurgy; Microstructure; Nanotechnology; Nitrides; Nitriding; Physical metallurgy; Structural Materials; Surfaces and Interfaces; Thin Films
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-015-3148-1

The microstructure, phase composition, and room-temperature mechanical properties of the corrosion-resistant Fe-20pctCr-5pctV alloy doped with nitrogen by high-temperature gas-phase nitriding under different conditions have been investigated. The nitriding of the Fe-20pctCr-5pctV alloy at T  = 1223 K to 1373 K (950 °C to 1100 °C) and subsequent annealing at T  = 973 K (700 °C) lead to the precipitation of large vanadium nitride and disperse chromium nitride particles in the ferrite matrix. Such a treatment increases the strength of the Fe-20pctCr-5pctV alloy at room temperature by 1.6 times, while maintaining the adequate relative elongation. The alloy in the initial state and after nitriding is highly resistant to corrosion.