Fatigue behavior and microstructural evolution of additively manufactured Inconel 718 under cyclic loading at elevated temperature
作者: P.D. NezhadfarAlexander S. JohnsonNima Shamsaei
作者单位: 1Department of Mechanical Engineering, Auburn University, Auburn, AL 36849, USA
2National Center for Additive Manufacturing Excellence (NCAME), Auburn University, Auburn, AL 36849, USA
3TriVector Services Incorporated, Huntsville, AL 35801, USA
刊名: International Journal of Fatigue, 2020, Vol.136
来源数据库: Elsevier Journal
DOI: 10.1016/j.ijfatigue.2020.105598
关键词: Laser beam directed energy deposition (LB-DED)Inconel 718FatigueElevated temperatureMicrostructure
原始语种摘要: Abstract(#br)This study investigates the fatigue behavior of Inconel 718 (IN718) fabricated through laser beam directed energy deposition (LB-DED) process. Fully-reversed (R ε = −1) strain-controlled fatigue tests are conducted on LB-DED IN718 specimens at 650 °C and the results are compared with those of LB-DED IN718 specimens tested at room temperature as well as the ones obtained from wrought counterparts at both room temperature and 650 °C. The microstructure is characterized after fabrication, heat treatment, and fatigue tests at elevated temperature. Microstructure characterizations reveal that as-built LB-DED IN718 has a dendritic structure. The heat treatment applied could not eliminate the dendritic structure, and needle-like δ phases are formed on the grain boundaries. The...
全文获取路径: Elsevier  (合作)
影响因子:1.976 (2012)

  • temperature 温度
  • manufactured 出品
  • loading 加负载
  • deposition 沉积
  • directed 有[定,方]向
  • cyclic 循环的
  • behavior 行为
  • evolution 进化
  • elevated 高的
  • under 在下