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Laser-assisted friction stir processing of IN738LC nickel-based superalloy:stir processing of IN738LC nickel-based superalloy: Stir zone characteristics.tir zone characteristics

Mousavizade, S. M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1080/13621718.2015.1119967
  3. Publisher: Taylor and Francis Ltd
  4. Abstract:
  5. Friction stir processing (FSP) of high softening-temperature materials such as nickel-based superalloys is considered to be difficult. Laser heating of a localised area ahead of the FSP tool was used to provide sufficient plasticity during the FSP of IN738LC nickel-based superalloy. The stir zone (SZ) microstructure of the friction stir processed and laser-assisted friction stir processed were characterised. Laser-assisted friction stir processing (LAFSP) produced a defect-free pass, but FSP resulted in generation of a discontinuity in the SZ. Both lower volume fraction of partially dissolved γ′ precipitates and coarser grain structure of SZ in LAFSP led to more ductility of the SZ material and elimination of the defects
  6. Keywords:
  7. IN738LC ; Defects ; Friction ; Laser heating ; Nickel ; Superalloys ; Tribology ; Defect-free ; Friction stir ; Friction stir processing ; Laser-assisted ; Nickel- based superalloys ; Softening temperature ; Stir zones ; Friction stir welding
  8. Source: Science and Technology of Welding and Joining ; Volume 21, Issue 5 , 2016 , Pages 374-380 ; 13621718 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/13621718.2015.1119967?journalCode=ystw20