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Proton Irradiation Induced Hardening and Its Recovery During Healing Treatment of Modified 9Cr–1Mo Steel

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Abstract

The current paper identifies the mechanism of hardening of modified 9Cr–1Mo steel during 3 MeV proton irradiation and softening during healing treatment. The steel, when irradiated with 3 MeV protons to a dose of 0.14 dpa, showed a significant increase in hardness up to certain depth, followed by a decrease. The peak hardness appeared at a depth of 35–40 µm, which matched with the depth at which defect density was maximum as calculated using SRIM2003 code. Rietveld analysis of X-ray diffraction patterns from different depths confirmed that the defect density doubled at the subsurface after irradiation. Annealing the irradiated steel at 823 K for 30 min could partially reduce the defect density and hence, soften the steel.

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Acknowledgements

The authors wish to acknowledge the keen and constant encouragement shown by Dr. S. Raju, Head, PMD, Dr. Saroja Saibaba, AD, MCG, Dr. G. Amarendra, Director, Metallurgy and Materials Group, Dr. A.K Bhaduri, Director, IGCAR and Dr. M. Vijayalakshmi, former AD, PMG in the pursuit of their studies on present work.

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Authors and Affiliations

  1. Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    V. Thomas Paul, S. Murugesan & P. Parameswaran

  2. Materials Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    B. Sundaravel

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  1. V. Thomas Paul
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Correspondence to V. Thomas Paul.

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Paul, V.T., Sundaravel, B., Murugesan, S. et al. Proton Irradiation Induced Hardening and Its Recovery During Healing Treatment of Modified 9Cr–1Mo Steel. Trans Indian Inst Met 71, 2293–2301 (2018). https://doi.org/10.1007/s12666-018-1361-5

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