Effect of Cr and Ni on Stress Corrosion Cracking Susceptibility in Ni-Cr-Fe Alloys Under Simulated Pressurized Water Reactor Primary Conditions

Kanzaki, Manabu; Masaki, Yasuhiro; Kudo, Takeo

doi:10.5006/1696

Cited by 17 publications

(4 citation statements)

References 22 publications

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“…In austenitic stainless steels, Cr can improve the SCC resistance. The Cr enrichment in passive films is of great help for enhancing corrosion resistance because of the formation of Cr 2 O 3 during the corrosion process [22][23][24]. Figure 11 shows the XPS spectra of different elements in passive films of the two joints.…”

Section: Corrosion Productsmentioning

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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Section: Corrosion Productsmentioning

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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“…Recent advanced characterization techniques have provided new insights into selective grainboundary oxidation reactions driving IG corrosion and stress corrosion cracking (SCC) of alloys [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and diffusion of atomic oxygen and sulfur at pristine and doped Ni surfaces with implications for stress corrosion cracking

et al. 2016

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A density-functional-theory modeling study of atomic oxygen/sulfur adsorption and diffusion at pristine and doped Ni(111) and (110) surfaces is presented. We find that oxygen and sulfur feature comparable adsorption energies over the same surface sites, however, the surface diffusion of sulfur is characterized by an activation barrier about one half that of oxygen. Calculations with different alloying elements at Ni surfaces show that Cr strongly enhances surface binding of both species in comparison to Al. These results in combination with previous modeling studies help explain the observed differences in selective grain boundary oxidation mechanisms of Ni-Cr and Ni-Al alloys.

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“…Ni-Cr-Fe solid-solution-strengthened Ni-based alloys have wide applications prospect in nuclear power industry [1][2][3]. Before Filler metal 52 was developed, Filler metal 82 and 182 were the widely used consumables for nuclear power fabrication and repair [4].…”

Section: Introductionmentioning

confidence: 99%

“…However, the application of Filler metal 82 and 182 in nuclear power industry showed that they were susceptible to primary water stress corrosion cracking (SCC) after several years [1]. In order to improve SCC resistance, the filler metals with high chromium, such as Filler metal 52, have been developed [2,4,5]. Unfortunately, based on practical production data and experiments results, these high-chromium nickel-based alloys were susceptible to hot cracking during welding [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Post-weld Heat Treatment on the Microstructure and Corrosion Resistance of Deposited Metal of a High-Chromium Nickel-Based Alloy

Liu

Chen

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The evolution of Cr 23 C 6 carbides in the deposited metal (DM) of a high-chromium nickel-based alloy was investigated after the post-weld heat treatment (PWHT) at 650, 750, 850, and 950°C, respectively. With the increase in temperature, the morphology of the Cr 23 C 6 carbides at the grain boundaries was transformed from the continuous lamellarlike to the semi-continuous rod-like and then to the discontinuous granular. Besides, the needle-like Cr 23 C 6 carbides precipitated from c matrix after PWHT at 850°C. The coarsening kinetics of the needle-like Cr 23 C 6 carbides obeyed the Lifshitz-Slyozov-Wagner law with the growth speed of 4.93 lm 3 /h in length and 5.56 9 10-3 lm 3 /h in width. Moreover, the ratio of the carbide length to width increased rapidly at first and then flattened as the holding time increased to 850°C. The results of electrochemical corrosion experiment indicated that the needled-like Cr 23 C 6 carbides impaired the corrosion resistance of DM due to the formation of chromium depletion around the carbides.

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Effect of Cr and Ni on Stress Corrosion Cracking Susceptibility in Ni-Cr-Fe Alloys Under Simulated Pressurized Water Reactor Primary Conditions

Cited by 17 publications

References 22 publications

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

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

Adsorption and diffusion of atomic oxygen and sulfur at pristine and doped Ni surfaces with implications for stress corrosion cracking

Effect of Post-weld Heat Treatment on the Microstructure and Corrosion Resistance of Deposited Metal of a High-Chromium Nickel-Based Alloy

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