Relationship between Crystallographic Texture and Dilatometric Behaviour of a Hexagonal Polycrystalline Material

Brachet, J.C.; Béchade, Jean Luc; Castaing, A.; Blanc, Loïc; Jouen, T.

doi:10.4028/www.scientific.net/msf.273-275.529

Cited by 10 publications

(5 citation statements)

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“…In the same way, the thermal expansion coefficients are comparable to those observed by Brachet et al [18]. For a zirconium-based alloy (Z > 98%), the dilatometric measurements realised between 473 K and 773 K ranged from 5.58 × 10 −6 K −1 to 8.31 × 10 −6 K −1 , depending upon the cutting range of the sample, leading to a thermal anisotropy ratio of 0.67.…”

Section: Discussionsupporting

confidence: 86%

Experimental creep behaviour determination of cladding tube materials under multi-axial loadings

Grosjean¹,

Poquillon²,

Salabura³

et al. 2009

Materials Science and Engineering: A

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Cladding tubes are structural parts of nuclear plants, submitted to complex thermomechanical loadings. Thus, it is necessary to know and predict their behaviour to preserve their integrity and to enhance their lifetime. Therefore, a new experimental device has been developed to control the load path under multi-axial load conditions. The apparatus is designed to determine the thermomechanical behaviour of zirconium alloys used for cladding tubes. First results are presented. Creep tests with different biaxial loadings were performed. Results are analysed in terms of thermal expansion and of creep strain. The anisotropy of the material is revealed and iso-creep strain curves are given.

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Section: Discussionsupporting

confidence: 86%

Experimental creep behaviour determination of cladding tube materials under multi-axial loadings

Grosjean¹,

Poquillon²,

Salabura³

et al. 2009

Materials Science and Engineering: A

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“…This figure shows that during heating, in contrast to the bulk contraction usually observed due to the a fi b phase transformation, an axial expansion was observed. This is due to texture-induced anisotropy effects, as explained elsewhere [4].…”

Section: Validation Of Phase Transformation Monitoringmentioning

confidence: 80%

“…In equilibrium conditions, these alloys undergo a phase transformation a (hcp) fi b (bcc) between 800 and 1000°C for the Zircaloy-4 (Zy-4) alloy [1] and between 600 and 1000°C for the Zr-1%NbO alloy [2]. On heating, this transformation is accompanied by a slight volumic contraction [3,4]. For technical reasons, it is necessary to establish the mechanical properties of cladding tubes, in particular in the temperature range corresponding to phase transitions.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of creep properties of Zirconium alloys together with phase transformation

et al. 2004

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The temperatures of a fi b transformation for the Zircaloy-4 and Zr-1%NbO alloys were determined using resistivity, calorimetry, image analysis and thermodynamic equilibrium calculations. The experimental and calculated results were found to be in good agreement. The steady state creep behavior was then determined in the single phase and (a+b) phase temperature ranges. Finally, the creep results for both alloys were modeled and summarized into deformation-mechanism maps.

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“…The difference in the rate growth of transformed β between these studies and the present paper could due to a possible discrepancy in starting metallurgical states and possible change in texture during heating before transformation. They used dilatometry to measure the phase fraction, the results of which could be influenced by changes in microstructure and texture via a difference in anisotropic thermal expansion [39]. Although it is clear from the texture evolution that the recrystallization starts, we did some ex-situ observation of the microstructure, texture and misorientation profile of the cold-rolled Zircaloy-4 after heating at 10 to 100ºCs -1 to before transformation temperature, e.g.…”

Section: Kinetics Of Phase Transformation Of Cold-rolled Zircaloy-4 At Fast Heating Ratesmentioning

confidence: 99%

Predicting the Flow Stress of Zircaloy-4 under In-Reactor Accident Conditions

Nguyen

Romero

Ambard

et al. 2018

Zirconium in the Nuclear Industry: 18th International Symposium

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During loss of coolant accident (LOCA) and reactivity-initiated accident (RIA), nuclear fuel rods experience high heating rates that change the microstructure and properties of zirconium cladding materials. The aim was to determine how different fast heating rates affect the kinetics of transformation and whether its consequences on the material yield stresses in the dual-phase region could be predicted. Phase fraction and texture of cold-rolled Zircaloy-4 were thus measured at fast heating rates similar to those experienced during LOCA and RIA by in-situ high-energy synchrotron x-ray diffraction; the yield stress was also measured at different heating rates to the same dual-phase temperature by electrical resistance method. Crystal plasticity finite element model was used to simulate the flow stresses with the inputs of the measured phase fraction and texture. The model is calibrated using the flow stress at the heating rate of 10ºCs -1 and used to predict the flow stress at the heating rate of 50ºCs -1 at the same temperature. A significant shift of the β transus temperature was identified for fast heating rates in the range of 10-100 o Cs -1 . There is great similarity in texture at different heating rates. In the dual-phase temperature region, the α texture is almost identical to the starting texture and the β texture is nearly random. Yield stresses of cold-rolled Zircaloy-4 decrease at faster heating rate at the same temperature of 920ºC. A good agreement was found between the experimental and predicted flow stress at

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Relationship between Crystallographic Texture and Dilatometric Behaviour of a Hexagonal Polycrystalline Material

Cited by 10 publications

References 0 publications

Experimental creep behaviour determination of cladding tube materials under multi-axial loadings

Experimental creep behaviour determination of cladding tube materials under multi-axial loadings

Experimental determination of creep properties of Zirconium alloys together with phase transformation

Predicting the Flow Stress of Zircaloy-4 under In-Reactor Accident Conditions

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