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Development of Multiphase Microstructure with Bainite, Martensite, and Retained Austenite in a Co-Containing Steel Through Quenching and Partitioning (Q&P) Treatment

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Abstract

The quenching and partitioning (Q&P) treatment of steel aims to produce a higher fraction of retained austenite by carbon partitioning from supersaturated martensite. Q&P studies done so far, relies on the basic concept of suppression of carbide formation by the addition of Si and/or Al. In the present study Q&P treatment is performed on a steel containing 0.32 C, 1.78 Mn, 0.64 Si, 1.75 Al, and 1.20 Co (all wt pct). A combination of 0.64 Si and 1.75 Al is chosen to suppress the carbide precipitation and therefore, to achieve carbon partitioning after quenching. Addition of Co along with Al is expected to accelerate the bainite transformation during Q&P treatment by increasing the driving force for transformation. The final aim is to develop a multiphase microstructure containing bainite, martensite, and the retained austenite and to study the effect of processing parameters (especially, quenching temperature and homogenization time) on the fraction and stability of retained austenite. A higher fraction of retained austenite (~13 pct) has indeed been achieved by Q&P treatment, compared to that obtained after direct-quenching (2.7 pct) or isothermal bainitic transformation (9.7 pct). Carbon partitioning during martensitic and bainitic transformations increased the stability of retained austenite.

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Acknowledgments

The authors duly acknowledge the financial support from Tata Steel R&D, Jamshedpur and the experimental facilities offered by I.I.T. Kharagpur and I.I.T. Bombay.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India

    Santigopal Samanta (Senior Research Fellow), Debalay Chakrabarti (Assistant Professor) & Shiv Brat Singh (Professor)

  2. Tata Steel Ltd, Jamshedpur, India

    Sourav Das (Principle Researcher, Researcher)

  3. Product Research Group, Research and Development (R&D), Tata Steel Ltd., Jamshedpur, 831 001, India

    Sourav Das (Principle Researcher, Researcher)

  4. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, 400 076, India

    Indradev Samajdar (Professor)

  5. Research, Development and Technology Division (RD&T), Tata Steel Europe, Swinden Technology Centre, Moorgate, Rotherham, S60 3AR, U.K.

    Arunansu Haldar (Department Manager)

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  1. Santigopal Samanta
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  2. Sourav Das
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  4. Indradev Samajdar
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Correspondence to Santigopal Samanta.

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Manuscript submitted April 11, 2013.

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Samanta, S., Das, S., Chakrabarti, D. et al. Development of Multiphase Microstructure with Bainite, Martensite, and Retained Austenite in a Co-Containing Steel Through Quenching and Partitioning (Q&P) Treatment. Metall Mater Trans A 44, 5653–5664 (2013). https://doi.org/10.1007/s11661-013-1929-y

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