Measurement of degree of sensitization in post-weld heat treated 13Cr-4Ni martensitic stainless steel clad using double loop electrochemical potentiokinetic technique

Bakhshayesh, M. Moshkbar; Farzadi, A.; Doustahadi, A.; Nouripour, MohammadHossain

doi:10.1016/j.engfailanal.2022.106046

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…The chromium depletion regions can be identified by a defined reverse peak around the same location as in the forward scan. The reverse peak was not very clear but at least there was a small hump around the forward peak [28,29]. This may be due to the regions in splat boundaries that are deficient in chromium.…”

Section: Microstructure Of Hvof Conicraly Coatingsmentioning

confidence: 95%

Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

Niaz

Fuhaid²,

Faraz³

2022

Coatings

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The thermal insulation and integrity of the thermal barrier coating is hampered by the formation of mixed oxide at intermediate bond coat. The existing reported work correlates growth of mixed oxide to the microstructural and phase changes. The track mostly used to study these changes is scanning electron microscopy, X-ray diffraction, and electrochemical testing. Oxide growth is principally an electrochemical process; hence a thirst exists to study this aspect by using advanced electrochemical techniques. In this study scanning electrochemical microscopy is used to reveal the electrochemical activity in the closest vicinity of the surface. A raster scan of 500 µm area was carried out by microelectrode in an electrolyte at a distance of 5 µm above the surface to record the current profile. The activity at the surface was confirmed by current distance curves. The tip of the microelectrode was approached from 60 µm height to 2 µm above the surface. The current–distance curves for the coating without heat-treatment show an active surface while the heat-treated one show non active surface. The average coating electrochemical response was further studied by polarization curves impedance spectroscopy. The X-ray photoelectron spectroscopy results show that oxidation and formation of the mixed oxide increase with polarization.

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Section: Microstructure Of Hvof Conicraly Coatingsmentioning

confidence: 95%

Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

Niaz

Fuhaid²,

Faraz³

2022

Coatings

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“…Subsequently, the diffusion of Cr atoms from some remote regions with respect to the carbides replenishes the Cr content in the Cr-depleted regions, narrowing the width of the Cr-depleted regions [20]. Additionally, at higher temperatures, the diffusion rate of the Cr atoms increases, which is favored to restore the corrosion resistance at 600 • C. Then, the carbides continue to precipitate and grow, and the Cr content slowly decreases and eventually achieves a plateau [46,47]. with the corrosion resistance of the samples.…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

“…Additionally, at higher temperatures, the diffusion rate of the Cr atoms increases, which is favored to restore the corrosion resistance at 600 °C. Then, the carbides continue to precipitate and grow, and the Cr content slowly decreases and eventually achieves a plateau [46,47]. Recently, several research groups have successfully characterized the Cr-depleted regions around M23C6 carbides by TEM-EDS line scanning in 13 wt.% MSSs [34], such as AM355 MSS [48] and 0Cr13 MSS [49], and proved that the Cr content of the Cr-depleted regions and the width of the Cr-depleted regions have a combined effect on the pitting resistance of the MSSs.…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Effect of Tempering Time on the Microstructure and Properties of Martensitic Stainless Steel

Jiang,

Wu,

Zhang

et al. 2024

Metals

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Martensitic stainless steels (MSSs) have been widely used in the manufacture of turbine blades, surgical instruments, and cutting tools because of their hardness and corrosion resistance. The MSSs are usually tempered at a temperature no higher than 250 °C after quenching to avoid the decline in the hardness, strength, and corrosion resistance of the steels. However, some short-time thermal shocks are inevitable in processes like welding, water grinding, laser marking, etc., in the manufacturing of kitchen knives, all of which may have negative effects on the mechanical properties and corrosion resistance. The effects of these short-time thermal shocks have rarely been studied. In this paper, the martensitic stainless steel 5Cr15MoV (X50CrMoV15 is European Standards) was selected to be tempered at the sensitization temperatures (480 to 600 °C) for a series of times (0.5 to 128 min) after quenching, and the microstructures, hardness, and corrosion resistance of the steel after tempering were investigated. It was shown that the variation in hardness and corrosion resistance of the 5Cr15MoV steel could be divided into four stages over time during tempering at the sensitization temperatures. The hardness of steel was found to increase at first and then decrease with time; accordingly, good corrosion resistance was retained in the initial few minutes of tempering, which then deteriorated fast. The variation in hardness and corrosion resistance of the 5Cr15MoV steel is related to the diffusion of C and Cr atoms at different tempering temperatures. The mechanism of the mechanical properties and corrosion resistance variation caused by the diffusion of C and Cr atoms during tempering at the sensitization temperatures was also discussed.

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“…More control over the welding process is possible with TIG welding, which produces precise, clean welds with little distortion or spatter. However, because after welding involves high heat input and quick cooling rates, it can also alter the microstructure and mechanical characteristics of the weld zone, HAZ and different reason of the welding plate [13]. The strength, ductility, and impact toughness of the welded joint can all be negatively impacted by these microstructural alterations [14].…”

Section: Introductionmentioning

confidence: 99%

Enhancing microstructure and mechanical properties of dissimilar TIG welded duplex 2205 and Ni-based inconel 718 superalloy through post weld heat treatment

Fande,

Kalbande,

Kavishwar

et al. 2024

Eng. Res. Express

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In demanding applications, maintaining structural integrity in dissimilar welded joints like those between duplex stainless steel and Ni-based superalloys requires achieving the best possible mechanical properties. This work examines the impact of post-weld heat treatment (PWHT) on the mechanical characteristics of joints made via double-sided tungsten inert gas (TIG) welding. The dissimilar welded joint was investigated by exposing it to the PWHT for 12 h at 650 °C. Reducing the negative impact of heat generated by welding on the mechanical characteristics and microstructure of the fusion zone was the main goal. To study for changes in the microstructure before and after PWHT, optical microscopy and scanning electron microscopy methods were used for microstructural analysis. To determine the effect of PWHT on the welded joints, mechanical properties such as tensile strength, toughness, and ductility were also assessed. The mechanical properties showed significantly enhanced characteristics and refined grain structures in the fusion zone.

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Measurement of degree of sensitization in post-weld heat treated 13Cr-4Ni martensitic stainless steel clad using double loop electrochemical potentiokinetic technique

Cited by 10 publications

References 19 publications

Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

Effect of Tempering Time on the Microstructure and Properties of Martensitic Stainless Steel

Enhancing microstructure and mechanical properties of dissimilar TIG welded duplex 2205 and Ni-based inconel 718 superalloy through post weld heat treatment

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