Characterizing Quenched Microstructures in Relation to Processing

Barbéris, Pierre; Tran, Minh Tien; Montheillet, F.; Piot, David; Gaillac, Alexis

doi:10.1520/stp154320120211

Cited by 1 publication

(3 citation statements)

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“…The influence of the heating rate was not put in evidence by the authors themselves. Its importance was pointed out by CEZUS [19] and, as already mentioned, investigated later [23] in the Georges Friedel laboratory (LGF) in which the present work was prepared.…”

Section: Heat Treatments Varying the Size Of The Prior B Grainsmentioning

confidence: 79%

“…The factors influencing the balance between basket-weave and parallel platelets are currently debated among scientists: see for example, the discussion appended to [19]. Two of them are discussed here: the roles of the SPPs and of the a GB phase.…”

Section: Role Of Some Microstructural Features Of Zircaloy-4mentioning

confidence: 99%

“…Hence, the selection of variants arises much interest. It is responsible for the crystallographic texture which is a consequence of mechanical processing [19].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the size of the prior β grains on the microstructure of β quenched Zircaloy-4

Ammar

Darrieulat

Aoufi

2018

Metall. Res. Technol.

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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.

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Section: Heat Treatments Varying the Size Of The Prior B Grainsmentioning

confidence: 79%

Section: Role Of Some Microstructural Features Of Zircaloy-4mentioning

confidence: 99%