Acta Metallurgica Sinica (English Letters)

, Volume 28, Issue 2, pp 249–253 | Cite as

Development of a New Ultrafine/Nano Ferrite-Carbide Microstructure by Thermomechanical Processing

  • Yousef Mazaheri
  • Ahmad Kermanpur
  • Abbas Najafizadeh
  • Navid Saeidi
Article

Abstract

The steel with the new microstructure, bimodal submicrometer equiaxed ferrite grains with uniformly distributed nanosized cementite particles, was manufactured by a new approach utilizing simple cold-rolling and subsequent annealing of a dual phase ferrite-martensite starting structure. The mean ferrite grain size and carbide size range of the specimen after 80% cold-rolling and subsequent annealing at 600 °C for 20 min were 0.35 µm and 70–140 nm, respectively. A combination of bimodal ultrafine ferrite and nanoscale carbides used as a more effective method for achieving an excellent balance in strength-ductility. The strength of the steel with the new microstructure increased to about 880 MPa (nearly 60% higher than that of the as-received state, e.g., 540 MPa), without significant loss of ductility.

Keywords

Low-carbon steel Dilatometry Thermomechanical processing Grain refinement Mechanical properties 

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Copyright information

© The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Yousef Mazaheri
    • 1
  • Ahmad Kermanpur
    • 1
  • Abbas Najafizadeh
    • 1
  • Navid Saeidi
    • 1
  1. 1.Department of Materials EngineeringIsfahan University of TechnologyIsfahanIran

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