Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 21, Issue 5, Pages 374-380Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2015.1119967
Keywords
Friction stir processing; Nickel-based superalloy; IN738LC; Stir zone; Laser heating
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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 gamma' precipitates and coarser grain structure of SZ in LAFSP led to more ductility of the SZ material and elimination of the defects.
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