The effect of nickel on the microstructure, mechanical properties and corrosion properties of niobium-vanadium microalloyed powder metallurgy steels


Ahssi M. A. M. , ERDEN M. A. , Acarer M., ÇUĞ H.

Materials, cilt.13, 2020 (SCI Expanded İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 13 Konu: 18
  • Basım Tarihi: 2020
  • Doi Numarası: 10.3390/ma13184021
  • Dergi Adı: Materials

Özet

© 2020 by the authors.In this study, the effects of adding Ni in different ratios to Fe-matrix material containing C-Nb-V produced by powder metallurgy on microstructure, tensile strength, hardness and corrosion behaviors were investigated. Fe-C and Fe-C-Nb-V powders containing 5%, 10%, 13%, 15%, 20%, 30% and 40% nickel were pressed at 700 MPa and then sintered in an Ar atmosphere at 1400 °C. Microstructures of the samples were characterized with optical microscope, scanning electron microscope (SEM) and XRD. Corrosion behaviors were investigated by obtaining Tafel curves in an aqueous solution containing 3.5% NaCl. Mechanical properties were determined by hardness and tensile testing. While Fe-C alloy and Fe-C-Nb-V microalloyed steel without Ni typically have a ferrite-pearlite microstructure, the austenite phase has been observed in the microstructures of the alloys with 10% nickel and further. Yield and tensile strength increased with nickel content and reached the highest strength values with 13% Ni content. The addition of more nickel led to decrease the strength. Analysis of Tafel curves showed that corrosion resistance of alloys increased with increasing nickel concentration.