The Effect of Interlayer Composition on Microstructure and Mechanical Properties of Transient Liquid Phase Bonded Dual Phase Steels

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Azqadan, Erfan | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47638 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Ekrami, Ali Akbar
Abstract:
Interlayer composition as one of the most important factors of TLP bonding could affect bonding region composition and microstructure that both of them govern the mechanical properties of the joint. Due to the risk of substrate microstructure degradation , welding of dual phase steel needs more cautions. TLP bonding ideally acquires joints having more similar microstructure to substrate. Moreover , using this method could avoid the change of base metal microstructure when heat treatment of carbon steel is postponed until after bonding. Fe-based , Ni-based and commercially pure Cu are three different composition has been studied in this work. The bonded samples were investigated by optic and scanning electron microscopy and Semi-quantitative chemical analysis was conducted on an energy dispersive spectrometer (EDS) system. Isothermally solidified joints followed by a simultaneous dual-phase heat treatment and homogenization stage. Shear test also carried out for completed and homogenized joints and base metal samples . Mechanical testing results proved feasibility of this method for production of reliable dual phase components
Keywords:
Mechanical Properties ; Dual-Phase Steels ; Interlayer ; Transient Liquid Phase Boneling (TLPB) ; Ferrite-Martensite Dual Phase Steels

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