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Aging behavior of 17-4 PH stainless steel studied using XRDLPA for separating the influence of precipitation and dislocations on microstrain

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Abstract

The aging behavior of precipitation hardenable 17-4 PH stainless steel is studied by analyzing the changes in microstrain, crystallite size, and dislocation density derived from the modified Williamson–Hall (mWH) method and the Fourier analysis of XRD profiles. Aging treatment of this steel at 380, 430, and 480 °C for 0.5, 1, and 3 h durations leads to changes in the microstrain due to precipitation and substructural changes caused by dislocation annihilation. The microstrain estimated from the mWH method is dominated by the precipitate-induced effects. The influence of precipitates and dislocations on the mean squared strain 〈ε2(L)〉 are separated by fitting the variation of 〈ε2(L)〉 with an expression P0 + P1/L + P2/L2, where the parameter (P0)0.5 and P1 are shown to be related to the precipitate-induced and dislocation density-induced microstrain, respectively. The study shows that the XRD profile analysis can be used to separate the combined effects of precipitation and dislocation annihilation.

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ACKNOWLEDGMENTS

The authors thank Dr. C.R. Das, Metallurgy and Materials Group (MMG), for his help in acquiring the micrographs. The authors express their gratitude to Dr. T. Jayakumar, former Director, MMG, Indira Gandhi Center for Atomic Research (IGCAR) presently Visiting Professor, NIT, Warangal for many fruitful discussions during the course of the present study. The authors would also like to thank Dr. G. Amarendra, Director, MMG, IGCAR and Dr. A.K. Bhaduri, Director, IGCAR for their constant encouragement and support.

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Authors and Affiliations

  1. Non Destructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603 102, India

    R. Manojkumar, S. Mahadevan, C. K. Mukhopadhyay & B. P. C. Rao

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  1. R. Manojkumar
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  2. S. Mahadevan
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  3. C. K. Mukhopadhyay
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  4. B. P. C. Rao
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Correspondence to R. Manojkumar.

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Manojkumar, R., Mahadevan, S., Mukhopadhyay, C.K. et al. Aging behavior of 17-4 PH stainless steel studied using XRDLPA for separating the influence of precipitation and dislocations on microstrain. Journal of Materials Research 32, 4263–4271 (2017). https://doi.org/10.1557/jmr.2017.396

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  • DOI: https://doi.org/10.1557/jmr.2017.396

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