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Superplasticity and Diffusion Bonding of IN718 Superalloy
Authors:WB Han  KF Zhang  B Wang  DZ Wu
Affiliation:1. Laboratory of Bulk Nanostructured Materials, Belgorod State University, 85 Pobeda Str., Belgorod, 308015, Russia;2. Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan Str. 2, 142432, Chernogolovka, Russia;3. National University of Science and Technology «MISIS», Leninskii Prosp. 4, 119049, Moscow, Russia;4. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXCM, Wright-Patterson AFB, OH, 45433-7817, USA;1. Advanced Ceramics Group, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. School of Materials Science and Engineering, Yeungnam University, 214-1 Dae-dong, Gyeongsan, Gyeongbuk 712-749, Republic of Korea;1. Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, United Kingdom;2. Rolls-Royce plc, PO Box 31, Derby, DE24 8BJ, United Kingdom;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, PR China;2. School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710072, PR China;1. Department of Materials Science and Engineering, IIT Kanpur, Kanpur -208016;2. Materials Science Division, Bhabha Atomic Research Centre, Mumbai-400085;1. Service de Cardiologie, Centre Hospitalier Universitaire Sainte-Justine (CHUSJ), Université de Montréal, Montréal, Canada;2. Centre de Recherche, Centre Hospitalier Universitaire Sainte-Justine (CRCHUSJ), Université de Montréal, Montréal, Canada;3. Centre de Recherche, Centre Hospitalier de l’Université de Montréal (CRCHUM), Université de Montréal, Montréal, Canada;4. Université de Lyon, CREATIS; CNRS UMR5220; Inserm U1044; INSA-Lyon; Université Lyon 1, France;6. Service de Néonatologie, Centre Hospitalier Universitaire Sainte-Justine (CHUSJ), Université de Montréal, Montréal, Canada
Abstract:The superplasticity and diffusion bonding of IN718 superalloy were studied in this article. The strain rate sensitivity index m was obtained at different temperatures and various initial strain rates using the tensile speed mutation method; m reached its maximum value 0.53 at an initial strain rate of 1 ×10-4s-1 at 1253K. The diffusion bonding parameters, including the bonding temperature T,pressure p, and time t, affected the mechanism of joints. When the bonded specimen with 25μm thick nickel foil interlayer was tensile at room temperature, the shear fracture of the joints with nickel foil interlayer took place at the IN718 part. Microstructure study was carried out with the bonded samples. The microstructure shows an excellent bonding at the interfaces. The optimum parameters for the diffusion bonding are: T= 1273-1323K, p = 20-30MPa, t = 45-60min.
Keywords:superplasticity  diffusion bonding  nickel foil  IN718 alloy  SUPERALLOY  DIFFUSION BONDING  optimum parameters  interfaces  Microstructure  study  shear fracture  place  nickel  foil  interlayer  room temperature  specimen  mechanism  joints  time  pressure  bonding parameters  diffusion  strain rate
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