In Situ Investigation of Intergranular Stress Corrosion Cracking Initiation and Coalescence and Effects of Geometric and Microstructural Characteristics

Song, Danbi; Kim, Sung Woo; Hwang, Seong Sik; Kim, Dong Jin; Lee, Changhee

doi:10.5006/2872

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…In this study, the local strain due to the welding process on the surface of the material was estimated using kernel average misorientation (KAM) values derived from EBSD. Recently, KAM has been used to quantify local microscale residual strain distributions [16][17][18][19][20]. KAM is the average misorientation value between the reference point and a point close to the reference point [17,18].…”

Section: Microstructure Analysismentioning

confidence: 99%

“…It is important to investigate the residual stress and deformation in the weld area because these can result in reduced fatigue strength and corrosion [16][17][18][19][20]31,32]. The shrinkage that occurs during the cooling of weldments is known to induce tensile stress in welded parts.…”

Section: Electron Backscatter Diffractionmentioning

confidence: 99%

“…Several studies involving the evaluation of residual stress using KAM have been reported in the literature, including some recent papers detailing the extraction of KAM data from EBSD results [18][19][20]. In these studies, KAM values were used to indicate the amount of plastic deformation or residual stress, but there is a limit to identifying the residual stresses of the extensive area.…”

Section: Electron Backscatter Diffractionmentioning

confidence: 99%

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Relationship between Microstructure and Corrodibility of Local Dry Underwater Laser Welded 304 Stainless Steel

Song

Choi

Shin

et al. 2022

Metals

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To understand the relationship between microstructure and corrosion, in this study, underwater bead-on-plate laser welding was compared with the in-air laser welding of 10-mm-thick 304 stainless steel plates at different laser powers (2, 4, and 6 kW). Welding was performed via local dry underwater laser welding (UWLW) using a custom-designed nozzle and a fiber laser at a water depth of 70 mm. The best weld quality was obtained in both underwater and in-air environments using 2 kW of laser power. To understand the relationship between the microstructure and corrosion resistance of 304ss in underwater laser welding (UWLW), this study was conducted using a custom-designed nozzle. The grain boundary analysis revealed that the specimen prepared by UWLW had high-angle grain boundaries content approximately 1.5 times higher than that of the specimen produced by in-air laser welding, and the fraction of the coincidence site lattice (CSL) boundaries was increased remarkably. High residual stress and microchromium precipitation were observed in the UWLW specimen, and the corrosion rate of the same at 2 kW laser power was considerably similar to that of the in-air laser weld specimen.

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