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Quantitative Analysis of Variant Selection for Displacive Transformations Under Stress

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Abstract

The existing variant selection models for displacive transformations are mostly qualitative in nature and attempt to predict the bulk texture using several fitting parameters. Many of these models use Kurdjumov-Sach (K-S) type orientation relationships (ORs) and ignore the phenomenological theory of martensite crystallography. So far there has not been any attempt to assess variant selection in the level of individual variants within one austenite grain. In this work, new kinds of experiments and innovative mathematical models have been developed to critically assess the variant selection phenomenon during bainite transformation under externally applied stress. Volume fractions of individual variants in a austenite grain have been calculated for the first time. Patel and Cohen’s theory on variant selection has been used in a new mathematical framework. Hitherto unknown aspects of variant selection have been found, which is exciting and provides new insight into the subject.

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Acknowledgements

The authors express their sincere gratitude to Professor H.K.D.H. Bhadeshia, Tata Chair Professor, University of Cambridge, for many helpful discussions. He has also kindly given us permission to use the super bainitic steel for this work. The authors would also like to thank Dr. Mathew Peet, University of Cambridge, and Ms. Ankita Mangal, Tata Steel, for their help with this work.

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Authors and Affiliations

  1. Technology Group (Global Wires & Longs), Tata Steel, Jamshedpur, India

    Saurabh Kundu (Head Product Development)

  2. R&D Division, Tata Steel, Jamshedpur, India

    Anil Kumar Verma (Researcher) & Vikram Sharma (Scientific Assistant)

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  1. Saurabh Kundu
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  2. Anil Kumar Verma
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  3. Vikram Sharma
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Correspondence to Saurabh Kundu.

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Manuscript submitted January 22, 2011.

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Kundu, S., Verma, A.K. & Sharma, V. Quantitative Analysis of Variant Selection for Displacive Transformations Under Stress. Metall Mater Trans A 43, 2552–2565 (2012). https://doi.org/10.1007/s11661-011-0971-x

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  • DOI: https://doi.org/10.1007/s11661-011-0971-x

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