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Investigation of Creep Properties of Transient Liquid Phase Bonding of FSX-414 Co-based Superalloy

Kokabi, Dariush | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53652 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ekrami, Ali Akbar
  7. Abstract:
  8. The repair and production of Ni-based and Co-based superalloy parts have high importance in Oil and Gas, and Aerospace industries. Due to this issue, Transient Liquid Phase bonding is one of the most reliable welding methods for repair parts and fabricating new parts.In the present study, creep properties of similar transient liquid phase bonding of FSX-414 Co-based superalloy has been investigated and compared with creep properties of the un-bonded base metal. Firstly, the optimum condition of the bonding process was resulted from microstructural observations from different bonding conditions. Then, cylindrical samples for the aim of creep test specimens were fabricated in two different bonding atmosphere, Argon and Vacuum atmospheres. Finally, standard creep test specimens were prepared according to ASTM A370, and the creep test condition was applied on the bonded specimens.It was resulted that bonded specimens at the vacuum condition could reach to about 85% percent of creep life of the base material and for the bonded specimen, the ratio was 64% of base material creep properties. Moreover, hardness distribution profile across the bond region of vacuum condition bonded specimen possessed more uniform changes than the specimen which had been bonded at Argon atmosphere.SEM observations and fractography were done for the purpose of getting more detailed information of fractured surfaces. It was derived that fracture surface of two different bonded samples was partially ductile-brittle behavior and a Fe-Ni-carbide phase was detected on the fractured surfaces as one of fracture reasons through joint region
  9. Keywords:
  10. Transient Liquid Phase Boneling (TLPB) ; Fractography ; Creep Properties ; Cobalt Base Superalloy ; Vacuum Atmosphere Bonding ; Nickel-Base Superalloy

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