Effect of surface treatments on microstructure and stress corrosion cracking behavior of 308L weld metal in a primary pressurized water reactor environment

Dong, Lijun; Zhang, Xiaolong; Han, Yaolei; Peng, Qunjia; Deng, Ping; Wang, Shuliang

doi:10.1016/j.corsci.2020.108465

Cited by 16 publications

(2 citation statements)

References 43 publications

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“…In an another study, it was shown that the milling, grinding, and electropolishing induce SCC [26]. The present authors have previously reported that the misorientation development and related to Cr 2 O 3 evolution for the machined steel specimens [23].…”

Section: Introductionsupporting

confidence: 49%

Studies of Low-Temperature Sensitization after Sub-Surface Damage Evolution in Austenitic Stainless Steel

Srinivasan

2021

Metallogr. Microstruct. Anal.

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The specimens of austenitic stainless steels were machined to different strain rates (105 s −1 , 1050 s −1 , 1500 s −1 , 2100 s −1 ). These specimens were subjected to low-temperature sensitization (LTS) heat treatment. The LTS treatment was carried out at 475℃ and 575℃ for 24 h. Further, oxalic acid, double-loop electrochemical potentiokinetic reactivation (DL-EPR) were carried out. As-machined specimens were subjected to surface roughness measurements, optical microscopy, electron backscattered diffraction (EBSD), and Fourier transform infrared spectroscopy (FTIR) imaging measurements. Machined specimen exhibited more difficulty in passivation than the as-received specimen. The complete surface statistics were extracted.The specimens machined at a strain rate of 2100 s −1 were exhibited a higher degree of sensitization (DoS) at LTS of 575℃ and 475℃ for 24 h, respectively, than other specimens. It was found that specimens machined at a higher strain rate produced smoother roughness. FTIR imaging was used to extract the signal intensity of chromium oxide (Cr 2 O3) peak. Detected Cr 2 O3 peak/signal was strong for the specimen that exhibited lower DoS as estimated from FTIR-imaging.

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Section: Introductionsupporting

confidence: 49%

Studies of Low-Temperature Sensitization after Sub-Surface Damage Evolution in Austenitic Stainless Steel

Srinivasan

2021

Metallogr. Microstruct. Anal.

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“…With the proper control of wet micro-shot peening, the increased corrosion resistance of 304 SS is obtained in a chloride solution [26]. Moreover, the occurrence of SCC in 308 weld metal in a primary pressurized water reactor (PWR) environment can be effectively inhibited through polishing in colloidal silica slurry [27]. The combination of refined grain, increased hardness, and induced compressive stress in the peened layer improves the SCC susceptibility of 304 weld metal in 3.5% NaCl solution after high-energy shot peening [28].…”

Section: Introductionmentioning

confidence: 99%

Mitigating Stress Corrosion Cracking of 304L and 316L Laser Welds in a Salt Spray through Micro-Shot Peening

Kang,

Chen,

Shiue

et al. 2023

Metals

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Two austenitic stainless steel (ASS) plates, 304L and 316L, were cold-rolled (304R and 316R) with a 10% reduction in thickness and then subjected to laser welding. Cold rolling caused slight surface hardening and introduced residual tensile stress into the ASS plates. The susceptibility to stress corrosion cracking (SCC) of the welds (304RW and 316RW) was determined using the U-bend test pieces in a salt spray. To highlight the stress concentration at the weld’s fusion boundary (FB), the top weld reinforcement was not ground off before bending. Moreover, micro-shot peening (MSP) was performed to mitigate the SCC of the welds by imposing high residual compressive stress and forming a fine-grained structure. Cold rolling increased the susceptibility of the 304R specimen to pitting corrosion and intergranular (IG) microcracking. Moreover, pitting corrosion and SCC were found more often at the FBs of the 304RW. The corrosion pits of the peened 304RW (304RWSP) were finer but greater in amount than the those of the un-peened one. The results also indicated that the 316L ASS welds with MSP were resistant to the incidence of pitting corrosion and SCC in a salt spray. The better reliability and longer service life of dry storage canisters could be achieved by using 316L ASS for the construction and application of MSP on it.

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Superalloys

Behera

2021

Advanced Materials

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Effect of surface treatments on microstructure and stress corrosion cracking behavior of 308L weld metal in a primary pressurized water reactor environment

Cited by 16 publications

References 43 publications

Studies of Low-Temperature Sensitization after Sub-Surface Damage Evolution in Austenitic Stainless Steel

Studies of Low-Temperature Sensitization after Sub-Surface Damage Evolution in Austenitic Stainless Steel

Mitigating Stress Corrosion Cracking of 304L and 316L Laser Welds in a Salt Spray through Micro-Shot Peening

Superalloys

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