Comparing Reactivation Behavior of TIG and Laser Beam Welded Alloy 690

Abraham, Geogy J.; Bhambroo, Rajan; Kain, Vivekanand; Dey, G. K.; Raja, V.S.

doi:10.1007/s11665-012-0249-5

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…However, optical micrographs of the specimens after performing these tests showed that GBs were not attacked; only small pits can be seen (Figure 17). The optimized parameters of the DL-EPR test are similar to those adopted by Abraham, et al 37 Those authors have shown the usefulness of this test for selection of welding techniques and optimization of welding parameters.…”

Section: Comparison With Parameters In the Literaturementioning

confidence: 94%

Optimization of the Double Loop Electrochemical Potentiokinetic Reactivation Method for Detecting Sensitization of Nickel Alloy 690

et al. 2017

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Nickel alloy 690 (UNS N06690) is one of the current choices for nuclear power plant steam generator tubing. The severity of certain stress corrosion cracking submodes in Ni-Cr-Fe alloys, such as Alloy 690, may be a function of the alloy sensitization condition. Sensitization results from chromium carbide precipitation at or near grain boundaries when the alloy is exposed to temperatures from 500°C to 800°C, which causes local chromium depletion in the adjacent matrix. The objective of this work was to study the parameters that control the double loop electrochemical potentiokinetic reactivation (DL-EPR) method and to develop an optimized test routine for Alloy 690. Alloy 690 specimens were tested under different thermal treatments, tailored to obtain a variety of concentrations of chromium in solid solution near the grain boundary (GB) region. The DL-EPR method was applied to Alloy 690 in solutions with different concentrations of sulfuric acid and potassium thiocyanate, at 30°C and 50°C. The optimal condition for detecting sensitization of Alloy 690 was 0.5 M H2SO4 + 0.001 M KSCN, at 30°C. Optical micrographs confirmed an intergranular type of attack under thermally aged (sensitized) conditions. The ratio of the reactivation to the activation peak intensities (Ir/Ia) obtained in the DL-EPR test agreed well with mass loss obtained in boiling nitric acid solution with Cr(VI) additions (modified Huey test). Chromium depletion profiles near the GB of thermally treated specimens under different conditions were measured with the energy dispersive x-ray spectroscopy technique, performed on a transmission electron microscope. A model available in the literature was fitted to those results. The Ir/Ia ratio for Alloy 690, obtained when using the optimal DL-EPR testing conditions, correlated well with the Cr depletion zone width and depth near the GB.

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Section: Comparison With Parameters In the Literaturementioning

confidence: 94%

Optimization of the Double Loop Electrochemical Potentiokinetic Reactivation Method for Detecting Sensitization of Nickel Alloy 690

et al. 2017

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“…There are three main models of IGC: Cr depletion, second phase precipitation, and grain boundary adsorption. Abraham et al (2014) proposed that sensitivity to IGC is affected by the precipitation of chromium carbide at grain boundaries and the chromium-poor zone. Younes et al (1997) studied the effects of heat treatment on resistance to IGC, and they proposed that the ability of the 690 alloy to resist IGC was better than that of the 600 alloy.…”

Section: Introductionmentioning

confidence: 99%

Effects of a Magnetic Field on the Intergranular Corrosion of Inconel 690 in NaCl Solution

Yuan

et al. 2022

Front. Mater.

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The intergranular corrosion of Inconel 690 alloy in NaCl solution was investigated using in-line digital holography to observe the dynamic processes occurring at the electrode| electrolyte interface in both the absence and presence of a magnetic field (MF). MF reduced the anodic currents by 6 and 3% at 1.1 V in 0.5 M NaCl (pH = 6.44) and 0.5 M NaCl +0.01 M NaOH (pH = 11.5) NaCl solutions respectively because it may increase the amount of Cr on the electrode surface and change the structure of the surface film, thus enhancing the formation of an oxide film; however, MF affected the anodic current little due to the low Lorentz force at the low potential. It was observed that the intergranular corrosion began from a certain grain boundary and developed into other grain boundaries with and without MF. Because the anodic dissolution rate of Fe or Ni is much higher with MF than that without MF and the content of Fe or Ni was higher at a grain boundary than that at the other areas on the surface of the electrode, MF accelerated the intergranular corrosion.

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“…The effects of LBW and TIG on corrosion behaviour of welding joints have been studied by many researchers. Abraham et al [6,7] reported that the LBW joint showed higher corrosion resistance than the TIG joint for nickelbase alloys based on the electrochemical measurements. The same result was also obtained in the application of duplex stainless steels by Mourad et al [8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW

Wang

Chai

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The stress corrosion cracking (SCC) behaviour of AISI 304 pipe girth welds which were welded by a single-pass laser beam welding (LBW) and a multi-pass tungsten inert gas welding (TIG), respectively, was studied by the slow strain rate tests combined with the electrochemical corrosion tests. The results show that fracture of both the TIG joint and LBW joint occurs in the heat-affected zone (HAZ). According to the electron-backscattered diffraction observation of the microstructures, comparison of potentiodynamic polarization curves and X-ray photoelectron spectroscopy analysis of corrosion products on HAZs of the two joints after the electrochemical tests, the LBW joint exhibits better SCC resistance than the TIG joint in corrosion environments, due to the synthetic effect of more Cr 2 O 3 in corrosion products, finer grains, lower residual strain and higher δ-ferrite content in its HAZ. Although the TIG joint has better mechanical property, considering lower SCC susceptibility and higher production efficiency of the LBW joint, the LBW promisingly replaces the TIG for welding of AISI 304 pipes in the nuclear power industry.

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Comparing Reactivation Behavior of TIG and Laser Beam Welded Alloy 690

Cited by 5 publications

References 23 publications

Optimization of the Double Loop Electrochemical Potentiokinetic Reactivation Method for Detecting Sensitization of Nickel Alloy 690

Optimization of the Double Loop Electrochemical Potentiokinetic Reactivation Method for Detecting Sensitization of Nickel Alloy 690

Effects of a Magnetic Field on the Intergranular Corrosion of Inconel 690 in NaCl Solution

Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW

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