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Effects of Stress Ratio and Microstructure on Fatigue Failure Behavior of Polycrystalline Nickel Superalloy

  • H. Zhang
  • Z. W. Guan
  • Q. Y. Wang
  • Y. J. Liu
  • J. K. Li
Article
  • 104 Downloads

Abstract

The effects of microstructure and stress ratio on high cycle fatigue of nickel superalloy Nimonic 80A were investigated. The stress ratios of 0.1, 0.5 and 0.8 were chosen to perform fatigue tests in a frequency of 110 Hz. Cleavage failure was observed, and three competing failure crack initiation modes were discovered by a scanning electron microscope, which were classified as surface without facets, surface with facets and subsurface with facets. With increasing the stress ratio from 0.1 to 0.8, the occurrence probability of surface and subsurface with facets also increased and reached the maximum value at R = 0.5, meanwhile the probability of surface initiation without facets decreased. The effect of microstructure on the fatigue fracture behavior at different stress ratios was also observed and discussed. Based on the Goodman diagram, it was concluded that the fatigue strength of 50% probability of failure at R = 0.1, 0.5 and 0.8 is lower than the modified Goodman line.

Keywords

Crack initiation Goodman diagram High cycle fatigue (HCF) Nimonic 80A Stress ratio 

Notes

Acknowledgments

This work was supported by the National Natural Science Research Foundation of China (Nos. 11327801, 11502151, 11572057), the Program for Changjiang Scholars and Innovative Research Team (No. IRT14R37), and Key Science and Technology Support Program of Sichuan Province (No. 2015JPT0001).

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and EnvironmentSichuan UniversityChengduChina
  2. 2.School of Mechanical EngineeringChengdu UniversityChengduChina
  3. 3.Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, College of Architecture and EnvironmentSichuan UniversityChengduChina

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