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Effect of Microalloy Precipitates on the Microstructure and Texture of Hot-Deformed Modified 9Cr-1Mo Steel

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Abstract

Microalloying elements like Nb and V are added to modified 9Cr-1Mo steel to ensure excellent creep resistance by the formation of fine MX precipitates during tempering treatment. The effect of those elements on the evolution of microstructure (and texture) in hot-deformed steel has hardly been studied. Industrial processing of modified 9Cr-1Mo steel often develops deformed and elongated prior-austenite grain structure, which can be detrimental from property point of view. The present study shows that the formation of such structure can primarily be attributed to the pinning effect from strain-induced Nb(C,N) precipitation, which can effectively retard the static recrystallization of deformed-γ at high-deformation temperature and short inter-pass times (~10 seconds). Based on the results, the application of either heavy deformation pass at high-temperature or multiple-lighter passes maintaining sufficient inter-pass interval (30 to 50 seconds) is recommended to achieve fine and equiaxed γ-grain structure by dynamic recrystallization and static recrystallization, respectively.

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Acknowledgments

Authors acknowledge the financial support received from the Board of Research in Nuclear Sciences, India (BRNS/2759). Authors would like to thank Dr, Aniruddha Moirta from Indira Gandhi Centre for Atomic Research (IGCAR) for providing the material. Acknowledgements to Indian Institute of Technology, Kharagpur, for the provision of research facilities in the Central Research Facility as well as SGDRI equipment grant. Authors thank Dr. Mainak Ghosh from National Metallurgical Laboratory, Jamshedpur (CSIR-NML) for performing TEM studies on some samples.

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Authors and Affiliations

  1. Indian Institute of Technology Kharagpur, Kharagpur, WB, 721302, India

    Arya Chatterjee, A. Dutta, Md Basiruddin Sk, R. Mitra & D. Chakrabarti

  2. Indira Gandhi Centre for Atomic Research, Kalpakkam, TN, 603102, India

    A. K. Bhaduri

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  1. Arya Chatterjee
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  2. A. Dutta
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Correspondence to Arya Chatterjee.

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Manuscript submitted December 20, 2016.

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Chatterjee, A., Dutta, A., Sk, M.B. et al. Effect of Microalloy Precipitates on the Microstructure and Texture of Hot-Deformed Modified 9Cr-1Mo Steel. Metall Mater Trans A 48, 2410–2424 (2017). https://doi.org/10.1007/s11661-017-4039-4

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