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Analyses of Small Punch Creep Deformation Behavior of 316LN Stainless Steel Having Different Nitrogen Contents

  • J. Ganesh Kumar
  • K. Laha
  • V. Ganesan
  • G. V. Prasad Reddy
Article
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Abstract

The small punch creep (SPC) behavior of 316LN stainless steel (SS) containing 0.07, 0.11 and 0.14 wt.% nitrogen has been investigated at 923 K. The transient and tertiary SPC deformation of 316LN SS with various nitrogen contents have been analyzed according to the equation proposed for SPC deflection, \(\delta = \delta_{0} + \delta_{\text{T}} (1 - e^{ - \kappa t} ) + \dot{\delta }_{\text{s}} t + \delta_{3} e^{{\left[ {\varphi \left( {t - t_{\text{r}} } \right)} \right]}}\). The relationships among the rate of exhaustion of transient creep (κ), steady-state deflection rate (\(\dot{\delta }_{\text{s}}\)) and the rate of acceleration of tertiary creep (φ) revealed the interrelationships among the three stages of SPC curve. The first-order reaction rate theory was found to be applicable to SPC deformation throughout the transient as well as tertiary region, in all the investigated steels. The initial and final creep deflection rates were decreased, whereas time to attain steady-state deflection rate increased with the increase in nitrogen content. By increasing the nitrogen content in 316LN SS from 0.07 to 0.14 wt.%, each stage of SPC was prolonged, and consequently, the values of κ, \(\dot{\delta }_{\text{s}}\) and φ were lowered. Using the above parameters, the master curves for both transient and tertiary SPC deflections were constructed for 316LN SS containing different nitrogen contents.

Keywords

316LN SS nitrogen effect small punch creep tertiary transient 

Notes

Acknowledgments

The authors would like to express their deep sense of gratitude to Dr. M.D. Mathew, former head, Mechanical Metallurgy division, for initiating this research work. The support received from Dr. G. Amarendra, Scientist-in-charge, UGC-DAE-CSR Kalpakkam Node, is gratefully acknowledged. The authors sincerely thank the technical support received from Dr. S. Ravi and Mrs. J. Vanaja, Mechanical Metallurgy Division.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • J. Ganesh Kumar
    • 1
  • K. Laha
    • 1
  • V. Ganesan
    • 1
  • G. V. Prasad Reddy
    • 1
  1. 1.Metallurgy and Materials GroupIndira Gandhi Centre for Atomic ResearchKalpakkamIndia

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