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Metallurgical and Materials Transactions A

, Volume 50, Issue 2, pp 947–965 | Cite as

Ferrite Grain Refinement, Grain Size Distribution, and Texture After Thermomechanical Processing and Continuous Cooling of Low-C Steel

  • Sudipta PatraEmail author
  • Abhisek Mandal
  • Madhumanti Mandal
  • Vinod Kumar
  • Rahul Mitra
  • Debalay Chakrabarti
Article
  • 78 Downloads

Abstract

Single-pass and multi-pass deformation schedules were applied over 973 K to 1323 K (700 °C to 1050 °C) using a Gleeble® thermomechanical simulator to understand the effect of the number of deformation passes, strain per pass, and interpass interval on ferrite grain refinement, particularly for the formation of an ultrafine ferrite grain structure (ULFG) with favorable high-angle grain boundaries and texture components. The microstructure, texture, and grain boundaries were characterized using SEM and EBSD. In the single-pass schedule, a decrease in deformation temperature from 1323 K to 1073 K (1050 °C to 800 °C) refined the ferrite grain size from 9.5 to 2.0 μm and intensified the beneficial γ-fiber (〈111〉//ND) texture. The ferrite grain size remained unchanged, whereas Cube and Goss texture strengthened with a further decrease in deformation temperature to 973 K (700 °C). For the multi-pass schedule at 1073 K (800 °C), where the total deformation was applied in three successive passes with 10-second interpass time, an ULFG structure was also developed with 2.5 μm grain size. Grain growth during the interpass intervals weakened the texture in the multi-pass deformed samples compared to that of the single-pass deformed samples. The evolution of microstructure and texture has been explained considering that restoration mechanisms (recrystallization, grain growth, and phase transformation) acted during and after deformation. Finally, ferrite grain refinement during different processing schedules was predicted using a simple mathematical approach based on the experimental data, with suggestions for future improvements.

Notes

Acknowledgments

The authors would like to acknowledge RDCIS, SAIL (Ranchi) for providing the research material and offering the Gleeble 3500® testing facility. Facilities developed under Institute SGDRI-2015 grant from IIT Kharagpur deserves special mention. Technical support received for SEM and EBSD at Central Research Facility of IIT Kharagpur is gratefully acknowledged. Authors are grateful to Professor Claire Davis, WMG, The University of Warwick for her valuable time and effort in the final correction of the manuscript.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Sudipta Patra
    • 1
    • 2
    Email author
  • Abhisek Mandal
    • 1
  • Madhumanti Mandal
    • 1
    • 3
  • Vinod Kumar
    • 4
  • Rahul Mitra
    • 1
  • Debalay Chakrabarti
    • 1
  1. 1.Indian Institute of Technology KharagpurKharagpurIndia
  2. 2.Jindal Stainless LimitedHisarIndia
  3. 3.The University of British ColumbiaVancouverCanada
  4. 4.Research and Development Centre for Iron and Steel, RDCIS, Steel Authority of IndiaRanchiIndia

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