Corrosion Resistance of TLP Bonded Stainless Steel 304

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Kazazi, Arash | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 51273 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Ekrami, Ali Akbar
Abstract:
Transient liquid phase bonding of AISI 304 was carried out in a vaccum furnace using a Ni-based interlayer. The effect of bonding time on microstructure and mechanical properties of joints at temperature of 1150 ⁰C was investigated. The results showed that isothermal solidification was completed within 20 min and eutectic phase disappeared across the joint region. The joints with complete isothermal solidification were homogenised for 180 min at temperature of 950 ⁰C. The results of shear test showed that the average shear strength of homogenised samples was about 83% thet of the base metal at the same heat treatment cycle. Corrosion behavior of the TLP bonded and base metal was studied at 23⁰C in 3.5% NaCl and 10% H2SO4 solutions. Corrosion resistance of TLP bonded was lower than base metal. Although, homogenising treatment increased the corrosion resistance of bonded samples. Isothermal thermogravimetric curves of both TLP bonded and base metal were plotted. The weight gain of TLP bonded in time period of 120 hours was greater than that of base metal at 925⁰C
Keywords:
Transient Liquid Phase Boneling (TLPB) ; Corrosion Resistance ; Oxidation ; 304 Austenitic Stainless Steel ; Nickel Based Interlayer

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