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Dynamic Transformation and Retransformation During the Simulated Plate Rolling of an X70 Pipeline Steel

  • Samuel F. RodriguesEmail author
  • Clodualdo AranasJr
  • Fulvio Siciliano
  • John J. Jonas
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The controlled rolling of pipeline steels involves pancaking the austenite and then subjecting it to accelerated cooling. However, the formation of ferrite during rolling decreases the amount of austenite available for microstructure control. Here the formation of ferrite during rolling is simulated using a five-pass rolling schedule applied by means of torsion testing. The first and last pass temperatures were 920 and 860 °C with 15° of cooling between passes. All of the rolling was carried out above the Ae3 temperature of 845 °C that applies to this steel. Interpass times of 10 and 30 s were employed, which corresponded to cooling rates of 1.5 and 0.5 °C/s, respectively. Samples were quenched before and after the first, third, and fifth passes in order to determine the amount of dynamic ferrite produced in a given pass. The amounts of dynamic ferrite formed and retained increased with pass number. The amounts of ferrite that retransformed increased with pass number. The simulations indicate that ferrite is unavoidably produced during plate rolling and that the microstructures present at the initiation of accelerated cooling do not consist solely of austenite.

Keywords

Dynamic transformation Plate rolling X70 pipeline steel 

Notes

Acknowledgements

The authors acknowledge with gratitude funding received from the Brazilian National Council for Scientific and Technological Development (SFR), the McGill Engineering Doctoral Award (MEDA) program (CAJr), and the Natural Sciences and Engineering Research Council of Canada (JJJ).

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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  • Samuel F. Rodrigues
    • 1
    • 2
    Email author
  • Clodualdo AranasJr
    • 1
  • Fulvio Siciliano
    • 3
  • John J. Jonas
    • 1
  1. 1.Department of Materials EngineeringMcGill UniversityMontrealCanada
  2. 2.Federal Institute of EducationScience and Technology of MaranhaoSão Francisco, São LuísBrazil
  3. 3.Dynamic Systems Inc.PoestenkillUSA

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