Influence of the cooling rate on the texture and the microstructure of Zircaloy-4 studied by means of a Jominy end-quench test

Ammar, Yamen Ben; Aoufi, A.; Darrieulat, Michel

doi:10.1016/j.msea.2012.06.077

Cited by 21 publications

(10 citation statements)

References 22 publications

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“…The evolution of the thermal profile consistently compares with the results obtained by Çakir et al [10], who used thermocouples to obtain the Jominy test cooling curves. Similar profiles in other specimens were obtained by Li et al [13] (In a AA7050 alloy), and Ben Ammar et al [14] (In an alloy, Zircaloy4).…”

Section: Methodssupporting

confidence: 87%

Numerical – Experimental correlation of microstructures, cooling rates and mechanical properties of AISI 1045 steel during the Jominy end-quench test

2015

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Section: Methodssupporting

confidence: 87%

Numerical – Experimental correlation of microstructures, cooling rates and mechanical properties of AISI 1045 steel during the Jominy end-quench test

2015

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“…This technique was originally designed to assess the hardenability of steels [31]. Recently it has been used to study the effect of the cooling rate on the microstructure of materials like aluminum [32,33], titanium alloys [34,35] and zirconium alloys [36].…”

Section: Jominy End-quench Testmentioning

confidence: 99%

“…The colonies of parallel lamellae are visible only for the cooling rate _ T _ = 6.5°C.s À1 . In [36], the authors performed the Jominy end-quench test on test-pieces of the same material which had not been subjected to previous heat treatment, reproducing the conditions of simple annealing. The b grains were about half the size of those examined here and gave more parallel platelets.…”

Section: Effect Of the Cooling Ratesmentioning

confidence: 99%

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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“…In practice, in order to reach good homogenization of alloying elements and/or optimized microstructures, β quenching is often carried out for various Zr alloys before rolling and annealing treatments [9,10,11]. In view of the importance of the β treatments, the effects of temperatures, time, and cooling rates on their β-cooled microstructures have been investigated by different researchers [12,13,14,15,16,17,18,19,20,21,22]. For example, Crepin et al [12] studied morphology and compositions of the particles precipitated in Zr702 after slow β cooling.…”

Section: Introductionmentioning

confidence: 99%

“…Detailed microstructural features of martensites were well characterized by electronic microscopy in Zircaloy-4 [19] and Zr–xNb alloys [13,15]. Crystallographic orientations of various plate structures induced by β cooling in a few Zr alloys were also tentatively explored in [17,18,20].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Microstructural Characteristics and Hardness of β-Quenched Zr702 and Zr–2.5Nb Alloys

et al. 2019

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In this study, two commercial Zr alloys (Zr702 and Zr–2.5Nb) were subjected to the same β-quenching treatment (water cooling after annealing at 1000 °C for 10 min). Their microstructural characteristics and hardness before and after the heat treatment were well characterized and compared by electron channel contrast (ECC) imaging, electron backscatter diffraction (EBSD) techniques, and microhardness measurements. Results show that after the β quenching, prior equiaxed grains in Zr702 are transformed into Widmanstätten plate structures (the average width ~0.8 μm) with many fine precipitates distributed along their boundaries, while the initial dual-phase (α + β) microstructure in Zr–2.5Nb is fully replaced by fine twinned martensitic plates (the average width ~0.31 μm). Differences in alloying elements (especially Nb) between Zr702 and Zr–2.5Nb are demonstrated to play a key role in determining their phase transformation behaviors during the β quenching. Analyses on crystallographic orientations show that the Burgers orientation relationship is well obeyed in both the alloys with misorientation angles between α plates essentially focused on ~60°. After β quenching, the hardnesses of both alloys were increased by ~35%–40%. Quantitative analyses using the Hall–Petch equation suggest that such an increase was mainly attributable to phase transformation-induced grain refinements. Since Nb is able to effectively refine the β-quenched structures, a higher hardness increment is produced in Zr–2.5Nb than in Zr702.

show abstract

Influence of the cooling rate on the texture and the microstructure of Zircaloy-4 studied by means of a Jominy end-quench test

Cited by 21 publications

References 22 publications

Numerical – Experimental correlation of microstructures, cooling rates and mechanical properties of AISI 1045 steel during the Jominy end-quench test

Numerical – Experimental correlation of microstructures, cooling rates and mechanical properties of AISI 1045 steel during the Jominy end-quench test

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

Comparative Study of Microstructural Characteristics and Hardness of β-Quenched Zr702 and Zr–2.5Nb Alloys

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