Metall. Res. Technol.
Volume 116, Number 1, 2019
|Number of page(s)||12|
|Published online||14 December 2018|
Influence of the size of the prior β grains on the microstructure of β quenched Zircaloy-4
Institut Préparatoire aux Études d’Ingénieurs de Nabeul (IPEIN), Campus Universitaire, Merazka,
2 Centre SMS, Laboratoire Georges Friedel, UMR CNRS n o 5307, École Nationale Supérieure des Mines de Saint-Étienne, 158 cours Fauriel, CS 62362, 42023 Saint-Étienne Cedex 2, France
* e-mail: email@example.com
Accepted: 4 October 2018
This work deals with the influence on Zircaloy-4 of annealing in the β domain and subsequent quenching in view of extrusion. The effect of the size of the prior β grains on the microstructure is investigated. The results indicate that for prior β grain sizes up to 1.6 mm, the β quenched Widmanstätten microstructure is distributed between “parallel platelets” and “basket-weave”. However, sizes larger than 2 mm promote the formation of “basket-weave”. Double annealing in the β domain leads to the formation of large prior β grains with no need to anneal for a long time. Indeed, protracted annealing may lead to exaggerated growth. Efficient double annealing requires some conditions: rate of cooling after the first β annealing a few °C.s−1 (air cooling), heating rates of 1 or 2 °C.s−1 during the second rise in temperature. The second cooling should be somewhat quicker (possibly 12 °C.s−1 and above) to obtain the thin, intricate lamellae favored for extrusion.
Key words: zirconium alloys / simple and double annealing / air and water cooling / microstructure / Jominy end-quench test
© EDP Sciences, 2018
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