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Enhancement in Creep Strength of Modified 9CR–1MO Steel Through Thermo-Mechanical Treatment

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Abstract

In the present investigation, microstructure of the modified 9Cr–1Mo (T91) steel was refined through thermo-mechanical treatment (TMT). The finer precipitation of M23C6 and MX precipitates were observed in the TMT processed T91 steel. Creep deformation behaviour of T91 steel and TMT processed T91 steel was carried out at 923 K. The minimum creep rate of the TMT processed steel was significantly lowered as compared to T91 steel. The TMT processing of modified 9Cr–1Mo steel resulted in enhancement of creep strength due to presence of finer precipitates which relatively delayed the recovery of dislocation structure and coarsening of sub-boundaries than the steel in the normalized and tempered condition.

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Acknowledgments

Authors acknowledge Board of Research in Nuclear Sciences (BRNS) for providing financial support to carry out this work.

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Authors and Affiliations

  1. Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    T. Sakthivel, P. Parameswaran & K. Laha

  2. Department of Metallurgical and Materials Engineering, National Institute of Technology, Warangal, 506004, India

    P. Shruti, G. V. S. Nageswara Rao & T. Srinivasa Rao

Authors
  1. T. Sakthivel
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  2. P. Shruti
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  3. P. Parameswaran
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  4. G. V. S. Nageswara Rao
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  5. K. Laha
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  6. T. Srinivasa Rao
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Correspondence to T. Sakthivel.

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Sakthivel, T., Shruti, P., Parameswaran, P. et al. Enhancement in Creep Strength of Modified 9CR–1MO Steel Through Thermo-Mechanical Treatment. Trans Indian Inst Met 70, 1177–1182 (2017). https://doi.org/10.1007/s12666-016-0902-z

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  • DOI: https://doi.org/10.1007/s12666-016-0902-z

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