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Manufacture, Mechanical Properties and Interfacial Corrosion of 316L/17-4PH Bimetals with a Nanostructured Ni Layer

Salahi, Armita | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43857 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdol Reza; Dolati, Abol Ghasem
  7. Abstract:
  8. Transient liquid phase (TLP) bonding of 316L/17-4PH bimetals using a thin layer of nanostructured nickel was studied. The nanostructured nickel interface was deposited through pulse current coating in a Watt bath. The TLP bonding was performed at different temperatures ranging from 1000 °C to 1300 °C using a nickel interface having different thicknesses (2-17µm) and crystallite size (14-67 nm). The microstructure of the joint bimetals and phase formation were studied using the optical and scanning electron microscopes and X-ray diffraction (XRD) method. The mechanical properties of the bimetals were evaluated by micro-hardness and shear tests. To evaluate the corrosion behavior of the interfacial zone, four-electrode polarization method was utilized. A defect-free bonding was attained after TLP bonding at 1300 °C by using 10 µm nickel interlayer with an average crystallite size of 30 nm. The shear strength was measured to be 401 MPa. The hardness variation across the bonding zone was shown more uniform distribution compared to the other conditions, showing in-deep diffusion of nickel in the base metals. The thickness of the diffusion zone was about 120 µm. The four-electrode polarization test showed a corrosion rate of 0.981 mpy, which was lower than the other examined joints
  9. Keywords:
  10. Galvanic Corrosion ; Bond Strength ; 316 Austenitic Stainless Steel ; Transient Liquid Phase (TLP) ; Nanostructured Nickel ; Bimetals ; Stainless Steel

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