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Mechanical Properties and Microstructural Characterization of Aged Nickel-based Alloy 625 Weld Metal

Title
Mechanical Properties and Microstructural Characterization of Aged Nickel-based Alloy 625 Weld Metal
Type
Article in International Scientific Journal
Year
2018-05
Authors
Cleiton Carvalho Silva
(Author)
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Victor Hugo C. de Albuquerque
(Author)
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Emerson Mendonça Miná
(Author)
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Elineudo P. Moura
(Author)
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João Manuel R. S. Tavares
(Author)
FEUP
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Journal
Vol. 49 No. 5
Pages: 1653-1673
ISSN: 1073-5623
Publisher: Springer Nature
Indexing
Publicação em ISI Web of Science ISI Web of Science
INSPEC
Scientific classification
CORDIS: Technological sciences
FOS: Engineering and technology
Other information
Authenticus ID: P-00N-QCR
Resumo (PT):
Abstract (EN): The aim of this work was to evaluate the different phases formed during solidification and after thermal aging of the as-welded 625 nickel-based alloy, as well as the influence of microstructural changes on the mechanical properties. The experiments addressed aging temperatures of 650 and 950 A degrees C for 10, 100, and 200 hours. The samples were analyzed by electron microscopy, microanalysis, and X-ray diffraction in order to identify the secondary phases. Mechanical tests such as hardness, microhardness, and Charpy-V impact test were performed. Nondestructive ultrasonic inspection was also conducted to correlate the acquired signals with mechanical and microstructural properties. The results show that the alloy under study experienced microstructural changes when aged at 650 A degrees C. The aging was responsible by the dissolution of the Laves phase formed during the solidification and the appearance of gamma aEuro(3) phase within interdendritic region and fine carbides along the solidification grain boundaries. However, when it was aged at 950 A degrees C, the Laves phase was continuously dissolved and the excess Nb caused the precipitation of the delta-phase (Ni3Nb), which was intensified at 10 hours of aging, with subsequent dissolution for longer periods such as 200 hours. Even when subjected to significant microstructural changes, the mechanical properties, especially toughness, were not sensitive to the dissolution and/or precipitation of the secondary phases.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 21
Documents
File name Description Size
E-TP-17-974-ARR Paper Draft 47611.85 KB
paper 1st page 748.42 KB
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