Phase Evolution During the Liquid-Phase Bonding of Zirconium and Austenitic Stainless Steel with Zinc Insertion

Liquid-phase bonding experiments were performed at 1073 K (800 °C) between ZIRCALOY-2 and type 316 austenitic stainless steel by inserting zinc as an interlayer. The evolution of the microstructure at the interface was studied and the formation of various phases was detected. On the zirconium side,...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2012-07, Vol.43 (7), p.2366-2377
Main Authors: Reboul, Guillaume, Nambu, Shoichi, Inoue, Junya, Koseki, Toshihiko
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steel
Characterization and Evaluation of Materials
Chemistry and Materials Science
Exact sciences and technology
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Microstructure
Nanotechnology
Nickel alloys
Structural Materials
Surfaces and Interfaces
Thermodynamics
Thin Films
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Summary:Liquid-phase bonding experiments were performed at 1073 K (800 °C) between ZIRCALOY-2 and type 316 austenitic stainless steel by inserting zinc as an interlayer. The evolution of the microstructure at the interface was studied and the formation of various phases was detected. On the zirconium side, the very rapid formation of Zn 3 Zr was detected, whereas on the steel side, an unexpectedly large amount of the base austenitic steel was observed to react with liquid Zn. The reacted iron solidified into a nickel-poor ferritic phase containing around 10 mol pct zinc, which grew into the austenite accompanied by a formation of a zinc-rich phase containing nickel. The reaction stopped when the zinc-rich phase reached saturation with a nickel content between 20 and 25 mol pct. Thermodynamic calculations showed that the addition of nickel to liquid zinc greatly decreases the free energy of the liquid phase, thus enabling a large stability range for the ferrite + liquid zone and reducing the stability range of the austenite. The primary equilibrium between the austenite and the liquid phase is thus metastable, and thus, the austenite transforms into ferrite and a high-nickel-content liquid. The transformation front then progresses until ternary equilibrium is reached between austenite, ferrite, and the zinc-rich phase.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-011-1074-4