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Characterization of High Temperature (873 K) Low Cycle Fatigue Damage in Modified 9Cr–1Mo Steel Using Magnetic Barkhausen Emission Technique

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Abstract

Modified 9Cr–1Mo (P91) ferritic steel is the steam generator structural material for prototype fast breeder reactor. During the start-ups and shutdowns, the material is subjected to conditions leading to low cycle fatigue damage. Detection of initiation of the fatigue damage is required to prevent the catastrophic failure in components of the steam generator. The present study reports the non-destructive characterization of substructural and microstructural changes occurring during low cycle fatigue (LCF) of modified 9Cr–1Mo base metal and weld joint at 873 K, using MBE measurements. MBE studies have been carried out on the samples at various levels of fatigue life by interrupting the fatigue test. MBE RMS voltage has been measured at different locations in the gauge portion of the samples to map the damage profile. The systematic changes in the MBE revealed various stages of progressive LCF damage starting from initial softening to final failure in the ferritic steel.

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Authors and Affiliations

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

    G. V. K. Kishore, K. Mariappan, Anish Kumar, Vani Shankar, R. Sandhya, B. Purnachandra Rao & K. Laha

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  1. G. V. K. Kishore
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  2. K. Mariappan
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  3. Anish Kumar
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  4. Vani Shankar
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  5. R. Sandhya
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  6. B. Purnachandra Rao
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  7. K. Laha
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Correspondence to Anish Kumar.

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Kishore, G.V.K., Mariappan, K., Kumar, A. et al. Characterization of High Temperature (873 K) Low Cycle Fatigue Damage in Modified 9Cr–1Mo Steel Using Magnetic Barkhausen Emission Technique. Trans Indian Inst Met 69, 315–318 (2016). https://doi.org/10.1007/s12666-015-0818-z

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  • DOI: https://doi.org/10.1007/s12666-015-0818-z

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