Metallography, Microstructure, and Analysis

, Volume 7, Issue 2, pp 222–238 | Cite as

Effects of Thermo-mechanical Process Parameters on Microstructure and Crystallographic Texture of High Ni–Mo Ultrahigh Strength Steel

  • G. Mandal
  • S. K. Ghosh
  • D. Chakrabarti
  • S. Chatterjee
Technical Article
  • 78 Downloads

Abstract

A novel low-carbon micro-alloyed steel has been developed with ultrahigh strength (UTS ~ 1700 MPa), satisfactory ductility (total elongation ~ 13%) and impact toughness (25 J/cm2 at − 40 °C) for light-weight applications in automobile, aerospace and defence sectors. The effect of finish rolling temperatures (850–750 °C) and cooling rate (air cooling versus water quenching) on the evolution of microstructure and crystallographic texture and finally on the mechanical properties of thermo-mechanically controlled processed steel has been studied. A refinement in mixed microstructure comprised of granular/lower bainite and lath/plate martensite and an intensification of Goss and rotated Goss texture components were found with the decrease in finish rolling temperature and increase in cooling rate. Interaction of fine-scale carbide/carbonitride precipitates of Nb and Ti with the dislocation substructure present within bainite and martensite contributed significant precipitation strengthening to the steel.

Keywords

Steel Thermo-mechanical controlled processing Texture Precipitation Impact toughness 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature and ASM International 2018

Authors and Affiliations

  • G. Mandal
    • 1
  • S. K. Ghosh
    • 1
  • D. Chakrabarti
    • 2
  • S. Chatterjee
    • 1
  1. 1.Department of Metallurgy and Materials EngineeringIndian Institute of Engineering Science and Technology, ShibpurHowrahIndia
  2. 2.Department of Metallurgical and Materials EngineeringIndian Institute of Technology, KharagpurKharagpurIndia

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