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Keywords: Zircaloy‐4
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7737-6
... This article proposes a detailed study of the recrystallization of Zircaloy4 under hot forming conditions by means of experimental and numerical tools. Thermomechanical tests and characterization campaigns that have been necessary for this work are described. Then, the different microstructure...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7737-6
... alloying systems of zirconium: Zircaloy-4, E635M, and E110opt. The temperature dependences of K IH and V DHC have the same behavior for all alloys but are quantitatively different. V DHC and its temperature dependence decrease for the alloys in the above sequence, whereas K IH increases...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7737-6
... at temperatures found during interim dry storage, handling, and transportation. This work evaluates the mechanical properties of Zircaloy-4 samples by means of elevated-temperature three-point bending flexural tests, elevated-temperature microindentation, and elevated-temperature nanoindentation. Experiments...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7737-6
... To better understand the effect of hydrides on accelerating Zircaloy-4 oxide growth in-reactor, two distinct studies were performed that utilized the Advanced Test Reactor. These and previous studies used three different ways of accelerating the accumulation of hydrogen: the use of samples...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7737-6
... that the dissolution solvus increases slightly as the hydride volume fraction increases. The apparent hydride volume fraction dependence is judged to result from an increasing self-stress imposed in the material as a result of increasing hydride precipitation. Zircaloy-4 hydride dissolution solvus 780...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7737-6
... High hydrogen pickup (HPU) and large scatter on HPU at high burnup/high exposure times is observed for Zircaloy-2 (Zr-2), which is used as fuel cladding, fuel channels, water rods, and spacer materials in boiling water reactors (BWRs). However, Zircaloy-4 (Zr-4) does not show this behavior...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2023
ISBN: 978-0-8031-7737-6
... Notched specimens with high or low constraint were tested in situ with a scanning electron microscope using hydrided Zircaloy-4 to develop an understanding of the mechanism for fracture initiation and propagation. High-resolution electron backscatter diffraction was used to identify the texture...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2021
ISBN: 978-0-8031-7690-4
... Laboratory work and publications on these topics related to Zircaloy-4, and it provides thoughts on the key areas for future development needed to advance our fundamental understanding of in-reactor corrosion, hydrogen pickup, and hydrogen redistribution in zirconium alloys. Zircaloy-4 corrosion...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2021
ISBN: 978-0-8031-7690-4
... In this study, deformation experiments together with high-resolution digital image correlation were used to quantify the effect of proton irradiation on strain localization in Zircaloy-4 loaded along the rolling and transverse directions. Significant increases in strain heterogeneity were...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2021
ISBN: 978-0-8031-7690-4
... of Zircaloy-4 and discusses the results in the context of previous work carried out in this area. The data from this work indicate that in nominal lithium concentrations, under certain combinations of a thermal gradient, two-phase flow, and stress, a significant acceleration in corrosion can be observed...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2021
ISBN: 978-0-8031-7690-4
... Eleven Zircaloy-4 samples were irradiated in the Advanced Test Reactor at a variety of temperatures and neutron flux levels for up to 6.5 years. Subsequently, the coupons were characterized with complementary techniques to understand the mechanisms behind oxide growth as a function of different...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2021
ISBN: 978-0-8031-7690-4
... detectable by neutron imaging methods. In situ neutron radiography investigations of the reaction of Zircaloy-4 in nitrogen/steam and air/steam atmospheres were performed to get more information about the reaction mechanisms and kinetics. The experiments were performed in the temperature range of 800...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2021
ISBN: 978-0-8031-7690-4
... Synchrotron X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy experiments were performed on samples from Zr-2.5Nb alloy pressure tubes and Zircaloy-4 fuel channels materials in order to define hydride precipitation temperatures, hydride...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... of transformation and whether their 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...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... behavior of the α Zr (O) and (prior-)β Zr phases containing high contents of oxygen and hydrogen, respectively. Model samples produced from M5® and Zircaloy-4 cladding tubes homogeneously charged in oxygen (less than or equal to 6 wt.%) and hydrogen (less than or equal to 3,000 wppm), respectively, were...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... Long-time Advanced Test Reactor (ATR) corrosion weight-gain data from nonfueled α-processed Zircaloy-4 cladding coupons are presented herein. The data were generated in pressurized loops that simulated pressurized water reactor (PWR) chemistry, temperature, and neutron flux conditions. High...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... A key microstructural feature of irradiated oxide films that form on Zircaloy-4 is the development of significant amounts of interconnected porosity or microcracking, particularly along oxide grain boundaries. This development disrupts the protective nature of the barrier layer, effectively...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... location. Using cold-worked stress-relieved Zircaloy-4, the results show that as the stress biaxiality ratio increased from uniaxial tension to near-equibiaxial tension, the threshold stress decreased from 155 to 75 MPa. To elucidate the hydride reorientation process, hydride precipitation and d-spacing...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... examined the impact of dissolved hydrogen (DH) concentrations on Zircaloy-4 corrosion and HPU when the samples are in contact with nickel sources. The work was completed in conjunction with a large project that evaluated the impact of dissolved hydrogen on various fuel cladding and spacer weld specimens...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7641-6
... to the destabilization of the LT scale and to the loss of its protective effect. Zircaloy-4 18 O oxidation air Raman imaging spent fuel pool ZIRCONIUM IN THE NUCLEAR INDUSTRY: 18TH INTERNATIONAL SYMPOSIUM 1059 STP 1597, 2018 / available online at www.astm.org / doi: 10.1520/STP159720160037 Anne Kasperski...