Journal ArticleDOI
Characterization of microstructure of A508III/309L/308L weld and oxide films formed in deaerated high-temperature water
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TLDR
The microstructure of A508III/309L/308L weld clad and the properties of the oxide films formed in simulated pressurized water reactor primary water at 290°C were characterized.About:
This article is published in Journal of Nuclear Materials.The article was published on 2018-01-01. It has received 23 citations till now. The article focuses on the topics: Oxide & Ferrite (magnet).read more
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Microscale investigation of the correlation between microstructure and galvanic corrosion of low alloy steel A508 and its welded 309/308L stainless steel overlayer
Bright O. Okonkwo,Bright O. Okonkwo,Hongliang Ming,Zhiming Zhang,Jianqiu Wang,Ehsan Rahimi,Ehsan Rahimi,Saman Hosseinpour,Ali Davoodi +8 more
TL;DR: In this paper, the microscopic scale correlation between microstructure and galvanic corrosion of low alloy steel-A508 and its welded-309/308L stainless steel overlayer is investigated.
Journal ArticleDOI
Microstructure and stress corrosion cracking of a SA508-309L/308L-316L dissimilar metal weld joint in primary pressurized water reactor environment
TL;DR: In this article, the SCC susceptibility of the base and weld metals of the dissimilar metal weld joint following the order of SA508 was investigated by the interrupted slow strain rate tension tests following a microstructure characterization.
Journal ArticleDOI
Microstructural characterization of low alloy steel A508 – 309/308L stainless steel dissimilar weld metals
Bright O. Okonkwo,Bright O. Okonkwo,Hongliang Ming,Jianqiu Wang,Fanjiang Meng,Xuelian Xu,En-Hou Han +6 more
TL;DR: In this paper, the microstructure and microhardness of low alloy steel A508 welded with 309/308L stainless steel are investigated, and it is shown that the heat affected zone of the A508 base metal changes, from tempered bainite to an uneven mixture of bainites and martensite, depending on the intensity of the heat flow from the welding process.
Journal ArticleDOI
A new method to determine the synergistic effects of area ratio and microstructure on the galvanic corrosion of LAS A508/309 L/308 L SS dissimilar metals weld
Bright O. Okonkwo,Bright O. Okonkwo,Hongliang Ming,Jianqiu Wang,En-Hou Han,Ehsan Rahimi,Ehsan Rahimi,Ali Davoodi,Ali Davoodi,Saman Hosseinpour +9 more
TL;DR: In this article, the synergistic effects of area ratio and microstructure on the galvanic corrosion of A508/309 L/308 L dissimilar metals weld (DMW) are studied by a multi-analytical approach.
A fundamental investigation of boundaries and structures in dissimilar metal welds
Abstract: AbstractCracking, or disbonding, along the fusion boundary in dissimilar metal welds has been a persistent problem, particularly in applications where austenitic alloys are clad on to structural steels for corrosion protection. Many failures in dissimilar metal welds occur as a result of cracking along a boundary that runs parallel to the fusion boundary in the adjacent weld metal. A preliminary investigation was undertaken to determine the nature and evolution of boundaries and structure in dissimilar metal welds using a simple ternary system composed of a pure iron substrate and a 70Ni–30Cu (Monel) filler metal. Changes in base metal dilution were found to alter the evolution of boundaries and structures near the fusion boundary dramatically. Optical metallography and electron microanalysis reveal that the resulting weld microstructures and boundaries are similar to those observed in engineering materials used for cladding and corrosion resistant overlay. Transmission electron diffraction analysis revea...
References
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Journal ArticleDOI
The mechanism of oxide film formation on austenitic stainless steels in high temperature water
TL;DR: In this paper, a double-layer structure of the inner layer consists of a chromium-rich spinel and is covered by an outer layer of magnetite or iron-nickel spinel.
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Quantitative Prediction of Environmentally Assisted Cracking
TL;DR: Ford et al. as mentioned in this paper used the W.R. Whitney Award to predict the cracking susceptibility of ductile alloys in aqueous environments with knowledge of the cracking mechanism.
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Microstructural features of dissimilar welds between 316LN austenitic stainless steel and alloy 800
TL;DR: In this article, the weld fusion zones and the interfaces with the base materials were characterised in detail using light and transmission electron microscopy, showing that the stainless steel weld metals solidified dendritically, while the 16-8-2 (16%Cr-8%Ni-2%Mo) weld metal showed a predominantly cellular substructure.
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Composition, structure and properties of the oxide films formed on the stainless steel 316L in a primary type PWR environment
TL;DR: In this article, a comprehensive study of the chemical composition, structure and electrochemical behaviour of oxide films developed on 316L stainless steel in a primary medium (1000 ppm B, 2ppm Li, 37ppm H2 at 350 °C).
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Mechanism of (Mg,Al,Ca)-oxide inclusion-induced pitting corrosion in 316L stainless steel exposed to sulphur environments containing chloride ion
TL;DR: In this paper, the mechanism of oxide inclusion-induced pitting corrosion in 316L stainless steel exposed to sulphur environments containing chloride ions was investigated by scanning electron microscope analysis, electrochemical measurements and scanning Kelvin probe force microscopy (SKPFM).