Determination of Constitutive Equation for Thermo-mechanical Processing of INCONEL 718 Through Double Multivariate Nonlinear Regression Analysis

  • Mirza Zahid Hussain
  • Fuguo Li
  • Jing Wang
  • Zhanwei Yuan
  • Pan Li
  • Tao Wu
Article
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Abstract

The present study comprises the determination of constitutive relationship for thermo-mechanical processing of INCONEL 718 through double multivariate nonlinear regression, a newly developed approach which not only considers the effect of strain, strain rate, and temperature on flow stress but also explains the interaction effect of these thermo-mechanical parameters on flow behavior of the alloy. Hot isothermal compression experiments were performed on Gleeble-3500 thermo-mechanical testing machine in the temperature range of 1153 to 1333 K within the strain rate range of 0.001 to 10 s−1. The deformation behavior of INCONEL 718 is analyzed and summarized by establishing the high temperature deformation constitutive equation. The calculated correlation coefficient (R) and average absolute relative error (AARE) underline the precision of proposed constitutive model.

Keywords

constitutive relationship double multivariate nonlinear regression INCONEL 718 
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Notes

Acknowledgment

The authors are very grateful for the support received from National Natural Science Foundation of China (No. 51275414), Aeronautical Science Foundation of China under Grant No. 2011ZE53059, and Graduate Starting Seed Fund of Northwestern Polytechnical University (Grant No. Z2014007).

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Copyright information

© ASM International 2015

Authors and Affiliations

  • Mirza Zahid Hussain
    • 1
  • Fuguo Li
    • 1
    • 2
  • Jing Wang
    • 1
    • 2
  • Zhanwei Yuan
    • 1
    • 2
  • Pan Li
    • 1
    • 2
  • Tao Wu
    • 1
    • 3
  1. 1.School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China
  2. 2.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anChina
  3. 3.Anda Aviation Forging CO., LTDAnshunChina

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