Microstructural characterization of Zr1Nb alloy after hot rolling
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2019
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International Journal of Refractory Metals & Hard Materials
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The nuclear industries have large interest on the development of new alloys involving zirconium (Zr) because
this material presents extraordinary mechanical properties, outstanding resistance to corrosion and high permeability
to thermal neutrons, being suitable for applications in areas such as energy and human health. The
alloy studied in this paper is formed by Zr and niobium (Nb), normally expressed as Zr1Nb. These two elements
have large chemical affinities with oxygen, carbon, and nitrogen, elements that normally are responsible for a
series of damages in the alloy. The principal goal of this work is to obtain Zr1Nb alloys and to perform microstructural
characterizations before and after the hot rolling process. The resulting alloys were subjected to a
process of heat treatment, the temperature was increased at a rate of 10 K/min up to 1273 K and maintained for
2 h, after which it was cooled down at −10 K/min until room temperature, with the only purpose of relieving
residual stresses. The next step was to apply the hot rolling process to the alloy. The sample initially measured,
approximately, 1.5 cm of thickness when it was inserted into the furnace at 1203 K to start the hot rolling. Every
pass on the hot rolling reduced the thickness by 0.5 mm, originating uniform and homogeneous samples of
2.5mm thickness. Auxiliary technical tools, such as XRD (X-Ray Diffraction), SEM (Scanning Electron
Microscopy), and EDS (Energy Dispersive X-Ray Spectroscopy), were used to analyze the microstructure of the
samples before and after the hot rolling process. The XRD results show the formation of only a single α-HCP
(Hexagonal Close Packed) phase for our samples, indicating that they are free of other phases that can damage
the material. This result is consistent and coherent with both SEM and EDS analysis. The observed homogeneity
of our samples is very good; proving that both techniques employed to obtain Zr1Nb as well as the hot rolling
process was well succeeded. Therefore, the obtained alloy can be directly used in the pipes of nuclear combustible
industries.
Como referenciar
SOUZA, ARMANDO C.; ARISTONE, FLAVIO; ROSSI, JESUALDO L.; MARTINEZ, LUIS G.; CIONE, FRANCISCO C.; TSAKIROPOULOS, PANOS; GRANDINI, CARLOS R.; SILVA, WALLACE F. da. Microstructural characterization of Zr1Nb alloy after hot rolling. International Journal of Refractory Metals & Hard Materials, v. 80, p. 216-224, 2019. DOI: 10.1016/j.ijrmhm.2018.12.015. Disponível em: http://repositorio.ipen.br/handle/123456789/30002. Acesso em: 22 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.