Effect of bonding temperature on the microstructure and electrochemical corrosion behavior of TLP ‎bonded AISI 304L stainless steel

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Binesh B.; Mirzaei S.; Taghi Ahari A.

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Journal Paper

Paper Information

Journal: JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN Year:2021 | Volume:7 | Issue:2 Page(s): 73-87

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Title

Effect of bonding temperature on the microstructure and electrochemical corrosion behavior of TLP ‎bonded AISI 304L stainless steel

Author(s)

Binesh B. | Mirzaei S. | Taghi Ahari A. | Issue Writer Certificate

Keywords

Transient liquid phase bonding

AISI 304L stainless steel

Isothermal solidification

Microstructure

Corrosion ‎resistance

Abstract

Transient liquid phase (TLP) bonding of AISI 304L stainless steel was carried out using BNi-2 amorphous interlayer. The Microstructure of the joint area was studied by using optical and scanning electron microscopes and energy dispersive spectroscopy. The effect of bonding temperature (1030-1110 °C) was studied on the Microstructure and corrosion behavior of the TLP bonded samples. Electrochemical corrosion resistance of the bonded samples was evaluated in 3. 5% NaCl solution at room temperature. The mechanism of the Microstructure formation and the solidification sequence at the joint area were discussed. Ni-and Cr-rich borides, Ni-Si-B compound and fine Ni3Si particles were identified in the γ-Ni matrix at the joint centerline. The microstructural investigations revealed that the solidification sequence of these phases is: L→ γ + L → γ + Ni boride + Cr boride + L → γ + Ni boride + Cr boride + Ni-Si-B Compound. The highest corrosion resistance was observed in the sample bonded at 1070 °C for 30 min, which is comparable to that of the as-received AISI 304L stainless steel. It was attributed to the bond region Microstructure with a negligible amount of eutectic constituents formed in the athermally solidified zone.

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