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Transient liquid phase bonding of dual phase steels using Fe-based, Ni-based, and pure Cu interlayers

Azqadan, E ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmapro.2017.09.006
  3. Abstract:
  4. Transient liquid phase (TLP) bonding is a joining process which combines benefits of diffusion bonding and brazing. Therefore, this method has widely been used in joining of materials which are sensitive to fusion welding. Interlayer composition, as one of the most important factors of TLP bonding, can affect the bonding region composition, microstructure, and hence mechanical properties of the joint. In this research, Fe-based, Ni-based, and commercially pure Cu interlayers are used to bond low-carbon steel components which are then heat treated to produce dual phase steel. The present work focuses on two main goals. Firstly, drawing a comparison of microstructure and mechanical properties of dual phase steel bonds made using three commonly used interlayers. Secondly, introducing simplifications that make the process of joining advanced high-strength steels (AHSS) more convenient for industrial applications. The samples were bonded at 1200 °C for different holding times and then homogenized at 730 °C for 75 min. The results of investigations made by optical and scanning electron microscopy, energy dispersive spectrometer (EDS), X-ray diffraction, microhardness measurements, and shear strength test show that all three interlayers produce joints with desirable mechanical properties; however, they show different microstructure of joint region and complete at different lengths of time. Also, samples bonded in air atmosphere showed similar microstructure and mechanical properties to the samples bonded in a vacuum chamber. © 2017
  5. Keywords:
  6. Interlayer composition ; Carbon ; Composite films ; Copper ; Joining ; Liquids ; Low carbon steel ; Mechanical properties ; Metal drawing ; Microstructure ; Nickel ; Scanning electron microscopy ; Spectrometers ; X ray diffraction ; Advanced high strength steel ; Dual-phase steel ; Energy dispersive spectrometers ; Interlayer compositions ; Microhardness measurement ; Microstructure and mechanical properties ; Shear strength tests ; Transient liquid phase bonding ; High strength steel
  7. Source: Journal of Manufacturing Processes ; Volume 30 , 2017 , Pages 106-115 ; 15266125 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S1526612517302591