EFFECTS OF TEMPERATURE AND STRAIN AMPLITUDE ON LOW-CYCLE FATIGUE PROPERTIES OF NICKEL-BASED SINGLE-CRYSTAL SUPERALLOY DD419

  • Xiaoming Du School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, People’s Republic of China
  • Weiye Dong School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, People’s Republic of China
  • Xiang Zhu School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, People’s Republic of China
  • Jide Liu Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
  • Zhijun Wang Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
  • Tianfu Li Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Keywords: nickel-based single-crystal superalloy, low-cycle fatigue, temperature, strain

Abstract

High-temperature and low-cycle fatigue tests were conducted on a nickel-based single-crystal superalloy DD419 under total strain-controlled conditions at 760 °C and 980 °C. The fatigue properties of the alloy are discussed by analysing the fatigue test data. Fracture morphology and dislocation structure were observed using scanning electron microscopy and transmission electron microscopy. At the same strain amplitude, the results indicate that the plastic deformation of the alloy is larger at 980 °C compared to 760 °C. This leads to a lower fatigue strength and shorter fatigue life, along with more severe damage. The value of the strain amplitude affects the cyclic stress response behaviour of the alloy. Under low strain amplitudes, the cyclic stress response behaviour differs between 760 °C and 980 °C. The hysteresis loop exhibits similar shapes at 760 °C and 980 °C, with an increase in the area as the strain amplitude rises. The fatigue fracture analysis indicates that micropores on the surface are the primary fatigue sources at 760 °C, while oxides on the surface are the main fatigue source at 980 °C, leading to cracking due to multiple sources. Moreover, transmission electron microscopy reveals that the deformation mechanism involving dislocations at 760 °C primarily occurs through plane slip and wave slip, whereas at 980 °C, dislocations mainly move through cross slip and climb.

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Published
2024-10-07
How to Cite
1.
DuX, Dong W, Zhu X, Liu J, Wang Z, Li T. EFFECTS OF TEMPERATURE AND STRAIN AMPLITUDE ON LOW-CYCLE FATIGUE PROPERTIES OF NICKEL-BASED SINGLE-CRYSTAL SUPERALLOY DD419. MatTech [Internet]. 2024Oct.7 [cited 2026Sep.10];58(5):567–575. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/1169