Article, 2024

On the low cycle fatigue behaviors of Ni-based superalloy at room temperature: Deformation and fracture mechanisms

Materials Characterization, ISSN 1873-4189, 1044-5803, Volume 211, Page 113920, 10.1016/j.matchar.2024.113920

Contributors

Kang, Jie [1] [2] Li, Runguang (Corresponding author) [1] [3] Wu, Dayong 0000-0002-6113-0904 (Corresponding author) [1] [2] Wang, Yiwen [2] Ma, Hai-Kun [2] Wang, Qian [2] You, Baocai [4] He, Peng [5] Dong, Hui-Cong [2] Su, Ru 0000-0003-4930-0082 (Corresponding author) [2]

Affiliations

  1. [1] University of Science and Technology Beijing
    2. [NORA names: China; Asia, East];
  2. [2] Hebei University of Science and Technology
    3. [NORA names: China; Asia, East];
  3. [3] Technical University of Denmark
    4. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD];
  4. [4] Shenyang Aircraft Design Institute, Shenyang 110000, China
    5. [NORA names: China; Asia, East];
  5. [5] China International Engineering Consulting Corporation (China)
    6. [NORA names: China; Asia, East]

Abstract

Understanding the deformation behavior of Ni-based superalloy IN718 across various temperature ranges is crucial due to its working temperature variability, despite its primary application in high temperatures. This study investigates the deformation and fracture mechanisms of IN718 alloy under room temperature (RT) low cycle fatigue (LCF) conditions. The findings shed light on the transition from single-slip to multi-slip dislocation configurations during cyclic deformation, which is accompanied by the formation of micro-twins that contribute to plastic deformation accommodation. Precipitate shearing mechanisms dominate the cyclic hardening in the early deformation stages, while the stabilization stage is characterized by the emergence of dislocation wall/cell-like structures resulting from the synergistic interactions between precipitation, element segregation, and dislocations. Cracks initiate near grain boundaries as the softening stage approaches and the dominant fracture mode is referred by grain boundary energy as substantiated by a detailed analysis of grain size and misorientation. Moreover, the growth of transgranular cracks is significantly influenced by grain orientation and local plastic deformation. This study advances the understanding of the deformation and fracture mechanisms exhibited by Ni-based alloys under RT LCF conditions and helps to further fracture observations and simulations.

Keywords

IN718, IN718 alloy, LCF conditions, Ni-based alloys, Ni-based superalloy IN718, Ni-based superalloys, accommodation, alloy, analysis, analysis of grain size, applications, approach, behavior, boundaries, boundary energy, conditions, configuration, crack, cycle fatigue, cycle fatigue behavior, cyclic deformation, cyclic hardening, deformation, deformation accommodation, deformation behavior, deformation stage, dislocation, dislocation configurations, dominant fracture mode, early deformation stage, elemental segregation, elements, emergency, energy, fatigue, fatigue behavior, findings, findings shed light, formation, formation of micro-twins, fracture, fracture mechanics, fracture mode, fracture observation, grain, grain boundaries, grain boundary energy, grain orientation, grain size, growth, hardening, high temperature, interaction, light, local plastic deformation, low cycle fatigue, low cycle fatigue behavior, mechanism, micro-twins, misorientation, mode, near grain boundaries, observations, orientation, plastic deformation, plastic deformation accommodation, precipitate shearing mechanism, precipitation, range, room, room temperature, segregation, shear mechanism, simulation, size, softening, stability, stabilization stage, stage, staged approach, structure, study, superalloy, superalloy IN718, synergistic interaction, temperature, temperature range, temperature variability, transgranular cracking, transition, variables, work

Funders

  • National Natural Science Foundation of China
  • Chinese Academy of Sciences

Data Provider: Digital Science

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