Pitting and Localized Galvanic Corrosion Characteristics of Gas Tungsten Arc Welded Austenitic Stainless Steel

Kim, Seung Hyun; Kim, Gi Dong; Oh, Chang-Young; Song, Sung Heon

doi:10.1007/s12540-021-01149-6

Cited by 12 publications

(1 citation statement)

References 25 publications

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“…Austenitic stainless steels (ASSs) are used to construct canisters to store low-and medium-level nuclear waste [1][2][3][4]. For the building of a nuclear waste canister, machining and/or cold rolling the ASS causes a phase transformation of austenite (γ) to martensite [5][6][7][8], while welding thermal cycles introduce residual tensile stress [9,10] into the final product.…”

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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