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Rare Metals

, Volume 38, Issue 10, pp 922–936 | Cite as

Constitutive modeling of a directionally solidified nickel-based superalloy DZ125 subjected to thermal mechanical creep fatigue loadings

  • Xiao-An HuEmail author
  • Xiao-Guang Yang
  • Duo-Qi Shi
  • Hui-Chen Yu
  • Ting-Ting Ren
Article

Abstract

A transversely isotropic continuum elasto-viscoplasticity model, which was developed from Chaboche’s unified constitutive model, was formulated to capture the thermal mechanical creep fatigue deformation behavior of a directionally solidified nickel-based superalloy. A fourth-order tensor was introduced to model material anisotropy. In order to model the tertiary creep behavior, the Kachanov damage evolution equation was coupled into the stress tensor. Based on the test results of uniaxial tensile, fatigue, and creep loadings at isothermal temperature conditions, the material parameters are obtained. Thermal mechanical fatigue (TMF) and creep–fatigue interaction test results were used to verify the robustness of the model. Additionally, strain–temperature-dependent stress–strain responses under TMF loadings were analyzed using the present model. Under strain-controlled conditions, both of the stress ranges and mean stresses are strongly influenced by the strain–temperature phases, a key parameter for TMF tests.

Keywords

Constitutive TMF Creep Viscoplastic Superalloy 

Notes

Acknowledgments

This research was financially supported by the National Basic Research Program of China (No. 2015CB057400).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.School of Energy and Power EngineeringBeihang UniversityBeijingChina
  2. 2.Science and Technology on Advanced High Temperature Structural Materials LaboratoryBeijing Institute of Aeronautical MaterialsBeijingChina
  3. 3.Air Force Armament DepartmentChina Aviation MuseumBeijingChina

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