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Microstructure-mechanical Properties Relationship of Transient Liquid Phase Bonded 304 Stainless Steel With a Co-based Interlayer

Sadeghian, Mohammad | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48786 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ekrami, Ali Akbar
  7. Abstract:
  8. Stainless steels have many applications in different industries like chemistry, medicine and food production. So for using these alloys it is necessary to join them with appropriate method. In this research, microstructure-mechanical properties relationship of 304LC austenitic stainless steel transient liquid phase bonded using a Co-based interlayer was investigated. For this purpose, bonding was conducted at 1180 ℃ for different holding times. Microstructure of the joints was evaluated by optical microscopy (OM) and Scanning Electron Microscopy (SEM). The results showed that isothermal solidification (IS) was completed within 1800s and no intermetallic compound was formed in the joint area for this holding time. The samples with complete IS were homogenized at 1000 ℃ for different times. Distribution of alloying elements and microstructural properties of the homogenized samples were evaluated. Also microhardness and shear strength tests were used to characterize the homogenized samples. The results showed that the highest bond strength was about 89% those of the base metal which was obtained for the 2h homogenized sample. This was attributed to more uniform distribution of alloying elemets and hardness profile of this sample
  9. Keywords:
  10. Microstructure ; Transient Liquid Phase Boneling (TLPB) ; 304 Austenitic Stainless Steel ; Cobalt Base Superalloy ; Mechanical Test ; Interlayer

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