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A united tension/compression asymmetry micro-mechanical model for nickel-base single-crystal alloys

  • Jian-feng Xiao
  • Hai-tao Cui
  • Hong-jian ZhangEmail author
  • Wei-dong Wen
Original Paper
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Abstract

In recent years, the micro-deformation mechanisms of the tension/compression behavior for nickel-base single-crystal superalloys have been studied extensively and general agreements have been derived. Based on these researches, a new model called united tension/compression asymmetry micro-mechanical model (UTCAM) has been proposed, which can effectively estimate the initial yield strength of nickel-base single-crystal (SC) superalloys under different loading directions. Considering the combined effects of octahedral slip system and cubic slip system, slip control factor is introduced in the UTCAM to determine the type of the open slip system of nickel-base single-crystal superalloys during deformation, thus making this model cover a rather wide range of application. Furthermore, the UTCAM is applied to hot tension and compression tests of three typical nickel-base SC superalloys (PWA1480-593 °C, RENE N4-760 °C and DD407-760 °C). The predicted initial yield strengths of the nickel-base SC superalloys are in good agreement with the experimental results, and the UTCAM proves to be effective.

Keywords

Nickel-base single-crystal superalloy Initial yield strength Tension/compression asymmetry Micro-mechanical model 
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Notes

Acknowledgements

This research has been supported by National Natural Science Foundation of China (51205190), the Fundamental Research Funds for the Central Universities (No. NS2016026), the Aeronautical Power Science Fund Project (6141B090317) and the Innovation Fund of Jiangsu Province, China (KYLX-0304).

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  1. 1.Jiangsu Province Key Laboratory of Aerospace Power System, State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Energy & Power EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina

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