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Nonisothermal Austenite Grain Growth Kinetics in a Microalloyed X80 Linepipe Steel

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Abstract

Nonisothermal austenite grain growth kinetics under the influence of several combinations of Nb, Ti, and Mo containing complex precipitates has been studied in a microalloyed linepipe steel. The goal of this study is the development of a grain growth model to predict the austenite grain size in the weld heat affected zone (HAZ). Electron microscopy investigations of the as-received steel proved the presence of Ti-rich, Nb-rich, and Mo-rich precipitates. The steel has then been subjected to austenitizing heat treatments to selected peak temperatures at various heating rates that are typical for thermal cycles in the HAZ. Thermal cycles have a strong effect on the final austenite grain size. Using a mean field approach, a model is proposed for the dissolution of Nb-rich precipitates. This model has been coupled to a Zener-type austenite grain growth model in the presence of pinning particles. This coupling leads to accurate prediction of the austenite grain size along the nonisothermal heating path simulating selected thermal profiles of the HAZ.

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  1. PHILIPS is a trademark of Philips Electronic Instruments Corp., FEI Company, Hillsboro, OR.

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Acknowledgments

The authors acknowledge the Natural Sciences and Engineering Research Council of Canada (NSERC), Evraz Inc. NA, and TransCanada Pipelines Ltd. for their financial support. We are also grateful to W.J. Poole for valuable discussions and suggestions. We thank H. Azizi-Alizamini, A. Meharwal, and M. Maalekian for their help with technical details of this work. One of the authors (MP) expresses his gratitude to Chad Sinclair and colleagues for their warm welcoming during a sabbatical stay at UBC from September 2008 to January 2009.

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Authors and Affiliations

  1. Research & Development Department, Tata Steel Ltd., Jamshedpur, 831007, India

    Kumkum Banerjee (Researcher)

  2. The Centre for Metallurgical Process Engineering, The University of British Colombia, Vancouver, BC, V6T 1Z4, Canada

    Matthias Militzer (Professor)

  3. Université de Lyon, INSA Lyon, MATEIS, UMR CNRS 5510, Lyon, France

    Michel Perez (Professor)

  4. Materials Science and Engineering Department, McMaster University, Hamilton, ON, L8S 4L7, Canada

    Xiang Wang (Research Associate)

Authors
  1. Kumkum Banerjee
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  2. Matthias Militzer
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  3. Michel Perez
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  4. Xiang Wang
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Corresponding author

Correspondence to Matthias Militzer.

Additional information

Manuscript submitted March 29, 2010.

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Banerjee, K., Militzer, M., Perez, M. et al. Nonisothermal Austenite Grain Growth Kinetics in a Microalloyed X80 Linepipe Steel. Metall Mater Trans A 41, 3161–3172 (2010). https://doi.org/10.1007/s11661-010-0376-2

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