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Journal of Materials Engineering and Performance

, Volume 27, Issue 8, pp 3812–3823 | Cite as

A Study of Tensile Flow and Work-Hardening Behavior of Alloy 617

  • Aditya Narayan Singh
  • A. Moitra
  • Pragna Bhaskar
  • Arup Dasgupta
  • G. Sasikala
  • A. K. Bhaduri
Article

Abstract

The simple power relationship σ = Κε p n satisfactorily expresses the tensile flow behavior of many metals and alloys in their uniform plastic strain regime. However, many FCC materials with low stacking fault energy have opposed such power law relationship. Alloy 617, an age-hardenable Ni-based superalloy is also observed not to obey the simple power law relationship neither in its solution-treated nor in its aged conditions. Various flow relationships were used to obtain the best fit for the tensile data, and different relationships were identified for the different aged conditions. The work-hardening rate (θ) demonstrates three distinct regions for all aged conditions, and there is an obvious change in the trend of θ versus σ. In the initial portion, θ decreases rapidly followed by a gradual increase in the second stage and again a decrease in its third stage is perceived in the Alloy 617. These three-stage characteristics are attributed to a commonly known precipitate, γ′: Ni3(Ti, Al) which evolves during aging treatment and well recognized under transmission electron microscopy (TEM) observation. TEM results also reveal a slight degree of coarsening in γ′ over aging. The tensile flow and the work-hardening behavior are well correlated with other microstructural evolution during the aging treatments.

Keywords

Alloy 617 Ludwigson equation thermal aging true stress–true plastic strain work hardening 

Notes

Acknowledgments

The authors of the manuscript take this opportunity to sincerely thank Ms. Paneer Selvi and Shri R. Balakrishnan of IGCAR for their help in carrying out the tensile tests. The author Aditya Narayan Singh gracefully acknowledges the junior research fellowship awarded by IGCAR.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Aditya Narayan Singh
    • 1
  • A. Moitra
    • 1
  • Pragna Bhaskar
    • 1
  • Arup Dasgupta
    • 1
  • G. Sasikala
    • 1
  • A. K. Bhaduri
    • 1
  1. 1.Metallurgy and Materials GroupIndira Gandhi Centre for Atomic Research, HBNIKalpakkamIndia

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