Investigation on microstructural evolution and hardening mechanism in dilute Zr–Nb binary alloys

Yang, Huilong; Matsukawa, Y.; Kano, Shinzo; Duan, Zhengang; Murakami, Kenta; Abe, Hiroaki

doi:10.1016/j.jnucmat.2016.09.016

Cited by 54 publications

(25 citation statements)

References 42 publications

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“…Figure 9 shows hardness maps of the cross-section of the RUW welds made from E110 alloy before and after oxidation at 1100 • C for 2, 10 and 30 min. The hardness of the as-received sample in the welding region was uniform and equal to 185-215 HV, which corresponds to the value for bulk Zr-Nb alloys [34]. The increase in hardness up to ~300, 350 and 420 HV was found for the uncoated samples after 2, 10 and 30 min oxidation, respectively.…”

Section: Hardness Distributionssupporting

confidence: 57%

High-Temperature Oxidation of Cr-Coated Resistance Upset Welds Made from E110 Alloy

2021

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The resistance upset welds (RUW) made from E110 alloy without and with Cr coatings were oxidized in air atmosphere at 1100 °C for 2, 10 and 30 min. The cross-section microstructure, elemental composition and hardness were studied before and after oxidation using optical and scanning electron microscopy, and indentations in welding region. The RUW welding does not noticeably change oxidation kinetics of E110 alloy. The most crucial effect has surface non-regularities formed after welding, which prevent uniform coating deposition on full surface of welded cladding tube and end plug. Cr coating deposition can strongly reduce oxidation of welded E110 alloy, while additional post-processing treatment should be applied to improve surface morphology after RUW welding. Several suggestions favorable to development of ATF Zr-based claddings using Cr coating deposition on welded nuclear rods were discussed.

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Section: Hardness Distributionssupporting

confidence: 57%

High-Temperature Oxidation of Cr-Coated Resistance Upset Welds Made from E110 Alloy

2021

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“…In industry, commercial Zr alloy fuel claddings are manufactured by several cycles of deformation (hot extrusion or cold pilgering) and heat treatment after β-quenching [21]. In order to give a comparative study of the manufacturing methods, many researchers [22][23][24][25] used hot rolling and cold rolling instead of hot extrusion and cold pilgering to fabricate Zr alloy sheets with the same thickness for fuel claddings in the laboratory condition. They found that the alloying elements are present as a supersaturated solid solution in the Zr matrix after β-quenching and that linearly distributed SPPs are found after hot rolling.…”

Section: Introductionmentioning

confidence: 99%

Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy

Chen

Sang

Zhang

et al. 2018

Metals

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Homogeneous distribution of fine second-phase particles (SPPs) fabricated by cycles of deformation and annealing in zirconium alloys is a critical consideration for the corrosion resistance of fuel claddings. Different deformation degrees of zirconium alloys would result in distinctive microstructures, leading to a distinct growth of SPPs during subsequent annealing. Unfortunately, the homogenization and growth behavior of SPPs in deformed zirconium alloys have not been well studied. In this work, a β-quenched Zr–Sn–Nb–Fe–Cu–Si–O alloy was rolled and annealed at 580 °C or 680 °C. The morphologies, distributions, and sizes of SPPs resulting from the different processing procedures were investigated. A linear distribution of SPPs is found in the β-quenched sample. Afterward, SPPs grow and are randomly distributed during heat treatment as the deformation degree or annealing time (or temperature) increases. The homogenization and growth of SPPs are attributed to the Ostwald ripening mechanism that is governed by lattice diffusion and short-circuit diffusion. The sample with a higher deformation degree is speculated to have a larger number of defects that provide more shortcuts for the mass transfer of SPPs, thereby facilitating a homogeneous distribution of fine SPPs during annealing.

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“…The results indicate that manganese addition increased the strength, which could be mainly associated with the solid solution hardening mechanism and did not adversely affect ductility corroborating with the literature 6 , which indicates that manganese increases the conformability and maintains a good relationship between strength and ductility. Yang et al 22 studied the hardening mechanisms of the niobium addition and identified that, for contents lower than 0.5 wt.%, hardening occurred mainly by solid solution whereas the precipitation hardening becomes expressive for contents greater than or equal to 1 wt.%.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Effect on Zr-Nb-Mn Alloys for Nuclear Reactor Application

2019

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Zr-Nb-Mn alloys were developed to investigate hydrogen diffusion and its effects among different manganese additions. Thermo-Calc ® and TC-Prisma simulations were used to determine the studied chemical compositions and to estimate the volume fraction and the mean radius of precipitates. Three compositions were chosen to be melted and thermomechanically processed, resulting in an α-Zr matrix with fine β-Nb precipitation. TDS results indicated that hydrogen diffusion coefficient was 10 -12 m 2 .s -1 for all the analyzed compositions. The manganese addition increased the strength while ductility was maintained. Although optical microscopy revealed that the increase of manganese content resulted in less oriented hydrides, the reduction in ductility was similar for the three studied compositions. Results showed manganese as a promising addition element for zirconium alloys due to the increase of hydrogen solubility, the good relationship between strength and ductility and the morphology of the hydrides.

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Investigation on microstructural evolution and hardening mechanism in dilute Zr–Nb binary alloys

Cited by 54 publications

References 42 publications

High-Temperature Oxidation of Cr-Coated Resistance Upset Welds Made from E110 Alloy

High-Temperature Oxidation of Cr-Coated Resistance Upset Welds Made from E110 Alloy

Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy

Hydrogen Effect on Zr-Nb-Mn Alloys for Nuclear Reactor Application

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