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Metallurgical and Materials Transactions A

, Volume 46, Issue 8, pp 3406–3413 | Cite as

Influence of Nb-Microalloying on the Formation of Nano/Ultrafine-Grained Microstructure and Mechanical Properties During Martensite Reversion Process in a 201-Type Austenitic Stainless Steel

  • Hojjat Samaei Baghbadorani
  • Ahmad Kermanpur
  • Abbas Najafizadeh
  • Peiman Behjati
  • Mohammad Moallemi
  • Ahad Rezaee
Article

Abstract

In this study, influence of Nb-microalloying on formation of nano/ultrafined grain microstructure and mechanical properties during martensite reversion process in a 201-type austenitic stainless steel microalloyed with Nb was investigated. For this purpose, the 90 pct cold-rolled samples with almost fully martensitic microstructure were reversion annealed at 1023 K to 1173 K (750 °C to 900 °C) for 5 to 1800 seconds. The microstructural evolution was characterized using X-ray diffractometer, Ferritescope, optical microscope, scanning, and transmission electron microscopes. Mechanical properties were evaluated using hardness and tensile tests. The reversion mechanism was found to be diffusion controlled. In comparison with other types of 201 steel, the kinetics of grain growth at 1173 K (900 °C) was much slower in the Nb-bearing steel, being related to the rapid precipitation of nano-sized Nb-rich carbonitrides during reversion process. At this temperature, the finest austenitic microstructure was achieved in the specimen reversion annealed for 60 seconds, possessing a microstructure composed of nano and ultrafined grains with an average grain size of 93 nm. This specimen exhibited an excellent combination of ultrahigh strength (yield strength of 1 GPa and tensile strength of 1.5 GPa) and good ductility (tensile elongation of 35 pct).

Keywords

Austenite Martensite Austenitic Stainless Steel Cold Rolling Tensile Elongation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2015

Authors and Affiliations

  • Hojjat Samaei Baghbadorani
    • 1
  • Ahmad Kermanpur
    • 1
  • Abbas Najafizadeh
    • 1
    • 2
  • Peiman Behjati
    • 1
  • Mohammad Moallemi
    • 1
  • Ahad Rezaee
    • 1
  1. 1.Department of Materials EngineeringIsfahan University of TechnologyIsfahanIran
  2. 2.Fould Institute of TechnologyFouldshareIran

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