The Effect of Ferrite Grain Size on Tlp Bonding Time of Dual Phase Steels

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Sheikhi Shooshtari, Roozbeh | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47347 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Ekrami, Ali Akbar
Abstract:
In this study, low carbon steels were joined with TLP bonding method; using a Fe based interlayer. Transient Liquid Phase bonding is a diffusional process in which as tempreture rises a melting point depressant element difuses in to the base metal and as a result the interlayer will isothermally solidify. Due to the fact that Ferrite grain size can effect the amount of diffusion which is taking place, in this study the effect of this variable on the isothermal solidification time was investigated using steels with different initial grain sizes. Microstructural studies indicated that as the mean grain size increases the time needed for the isothermal solidification to complete increases. Afterwards specimens which were isothermally solidified were homogenized and simontaniously converted to a dual phase Feritic-Martensitic steel. Eventually hardness and shear strength of the joints were evaluated and compared in different cases
Keywords:
Ferrite Grain Size ; Transient Liquid Phase Boneling (TLPB) ; Dual-Phase Steels ; Ferrite-Martensite Dual Phase Steels ; Microstructural Study ; Bonding Time

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