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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

Published online by Cambridge University Press:  07 November 2017

R. Manojkumar Open the ORCID record for R. Manojkumar [Opens in a new window] ,
S. Mahadevan ,
C.K. Mukhopadhyay  and
B.P.C. Rao
R. Manojkumar*
Affiliation:
Non Destructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603 102, India
S. Mahadevan
Affiliation:
Non Destructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603 102, India
C.K. Mukhopadhyay
Affiliation:
Non Destructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603 102, India
B.P.C. Rao
Affiliation:
Non Destructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603 102, India
*
a)Address all correspondence to this author. e-mail: manoj_raja@igcar.gov.in
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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.

Keywords

17-4 PH stainless steelprecipitate strengtheningdislocation annihilationmicrostrainphenomenological modelmodified Williamson–Hall method
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 22 , 28 November 2017 , pp. 4263 - 4271
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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