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Effect of temperature and strain amplitude on dislocation structure of M963 superalloy during high-temperature low cycle fatigue

Journal Article


Abstract


  • An investigation was made on the strain-controlled low cycle fatigue (LCF) of a cast Ni-base superalloy M963 over a wide total strain range of 0.15-0.6% at a temperature range from 700 to 950°C in air. Correlations between dislocation structure and the testing temperature and applied strain amplitude were enabled through transmission electron microscopy (TEM) observation. At a low temperature region (700 and 800°C), dislocation shearing γ precipitates by dislocation pairs and stacking faults at medium and high strain amplitudes, and a well-defined dislocation network at low total strain amplitudes were evident. At a high temperature region (900 and 950°C), dislocations by-passing γ precipitates was the main deformation mode. © 2006 The Japan Institute of Metals.

Publication Date


  • 2006

Citation


  • He, L., Zheng, Q., Sun, X., Guan, H., Hu, Z., Tieu, K., . . . Zhu, H. (2006). Effect of temperature and strain amplitude on dislocation structure of M963 superalloy during high-temperature low cycle fatigue. Materials Transactions, 47(1), 67-71. doi:10.2320/matertrans.47.67

Scopus Eid


  • 2-s2.0-33644802736

Start Page


  • 67

End Page


  • 71

Volume


  • 47

Issue


  • 1

Abstract


  • An investigation was made on the strain-controlled low cycle fatigue (LCF) of a cast Ni-base superalloy M963 over a wide total strain range of 0.15-0.6% at a temperature range from 700 to 950°C in air. Correlations between dislocation structure and the testing temperature and applied strain amplitude were enabled through transmission electron microscopy (TEM) observation. At a low temperature region (700 and 800°C), dislocation shearing γ precipitates by dislocation pairs and stacking faults at medium and high strain amplitudes, and a well-defined dislocation network at low total strain amplitudes were evident. At a high temperature region (900 and 950°C), dislocations by-passing γ precipitates was the main deformation mode. © 2006 The Japan Institute of Metals.

Publication Date


  • 2006

Citation


  • He, L., Zheng, Q., Sun, X., Guan, H., Hu, Z., Tieu, K., . . . Zhu, H. (2006). Effect of temperature and strain amplitude on dislocation structure of M963 superalloy during high-temperature low cycle fatigue. Materials Transactions, 47(1), 67-71. doi:10.2320/matertrans.47.67

Scopus Eid


  • 2-s2.0-33644802736

Start Page


  • 67

End Page


  • 71

Volume


  • 47

Issue


  • 1