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Metallurgical and Materials Transactions A

, Volume 40, Issue 6, pp 1355–1366 | Cite as

Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation

  • H.-G. Lambers
  • S. Tschumak
  • H. J. Maier
  • D. Canadinc
Article

Abstract

The role of time-temperature path on the isothermal austenite-to-bainite phase transformation of low alloy 51 CrV 4 steel was investigated and the corresponding microstructures were analyzed. The important finding is that an incomplete initial austenitization treatment leaves undissolved carbides in the matrix, such that lower carbon and chromium content in the matrix result, eventually accelerating the phase transformation. Furthermore, the residual carbides constitute additional nucleation sites for the bainite plates, speeding up the process even further. Also, both plastic pre-deformation of the supercooled austenite and application of external elastic stresses during the phase transformation lead to transformation plasticity by enhancing the stress fields, providing a driving force for the growth of bainite plates along a preferred orientation. Overall, the current results constitute the first step toward establishing a database for constructing a realistic microstructure-based model for simulating metal forming operations involving austenite-to-bainite phase transformation.

Keywords

Austenite Bainite Bainitic Transformation Transformation Plasticity Supercooled Austenite 
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.

Notes

Acknowledgments

Financial support by Deutsche Forschungsgemeinschaft within the Transregional Collaborative Research Centre TRR 30 “Prozessintegrierte Herstellung funktional gradierter Strukturen auf der Grundlage thermo-mechanisch gekoppelter Phänomene” is gratefully acknowledged. The authors also thank Mr. Juri Burow, University of Bochum, for carrying out the EBSD measurements presented herein.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2009

Authors and Affiliations

  • H.-G. Lambers
    • 1
  • S. Tschumak
    • 1
  • H. J. Maier
    • 1
  • D. Canadinc
    • 2
  1. 1.Lehrstuhl für Werkstoffkunde (Materials Science)University of PaderbornPaderbornGermany
  2. 2.Department of Mechanical EngineeringKoc UniversityIstanbulTurkey

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