Improving the oxidation resistance of 316L stainless steel in simulated pressurized water reactor primary water by electropolishing treatment

Han, Guangdong; Lu, Zhanpeng; Ru, Xiangkun; Chen, Jun Jie; Xiao, Qian; Tian, Yongwu

doi:10.1016/j.jnucmat.2015.09.029

Cited by 41 publications

(9 citation statements)

References 47 publications

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“…3c). Mechanical polishinginduced deformation layer has also been reported by many other researchers [8,[10][11][12][13][31][32][33][34][35][36][37]. After exposure to the simulated PWR primary water, a uniform and compact oxide film (less than 50 nm in thickness) formed on the outer surface (see Figs.…”

Section: The Effect Of Cold-worked Surface On the Crack Initiationsupporting

confidence: 64%

Characterization of the crack initiation and propagation in Alloy 600 with a cold-worked surface

et al. 2019

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The crack initiation on a cold-worked surface of Alloy 600, exposed to simulated pressurized water reactor primary water, was mechanistically studied through high-resolution characterization. Mechanical polishing introduced a thin recrystallization layer on the specimen surface, which lead to the crack initiation along highlydeformed recrystallization grain boundaries after preferential oxidation. Intergranular crack propagation occurred once the initiation cracks met the matrix grain boundaries under the external loading and the residual stress introduced by the prior 20% cold working. The controlling mechanism of SCC crack propagation was believed to be an intergranular selective oxidation mechanism.

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Section: The Effect Of Cold-worked Surface On the Crack Initiationsupporting

confidence: 64%

Characterization of the crack initiation and propagation in Alloy 600 with a cold-worked surface

et al. 2019

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“…Machining is usually the last treatment before the component is put into service, and therefore, it is important to understand the materials' environmental interaction and their implications on the materials' performance and stress corrosion cracking. In fact, it is known that the surface finish plays a fundamental role [8,10,45]. After laser irradiation, many surfaces appeared to discolor, especially when higher LE values were employed with consequently higher temperature.…”

Section: Discussionmentioning

confidence: 99%

“…Despite their very good corrosion resistance in an aqueous environment, these materials can suffer from environmentally-assisted degradation problems, and some instances of stress corrosion cracking (SCC) in nuclear power plants have occurred [2][3][4][5][6][7]. Amongst the main influencing parameters, surface finish [8][9][10] and residual stresses are the most important. Recent analyses on components removed from boiling water reactors also highlighted the importance of deformation of the surface and surface features, which promote SCC initiation [11,12].…”

Section: Introductionmentioning

confidence: 99%

Laser Irradiation Effects in Simulated Laser-Assisted Machining of Type 316L SS

Maurotto

Scenini

Kraemer

2018

JMMP

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Laser surface heating allows for the thermal treating of clearly defined surface areas thanks to the ability to focus the laser beam to a specific point. Thus, the rapid heating and subsequent rapid cooling when the beam is moved away, typically associated with laser light, is used as an in-machine process to improve the machinability of hard- or difficult-to-machine alloys. In laser-assisted machining (LAM), laser irradiation occurs simultaneously with materials removal; however, it is difficult to ensure a complete removal of the irradiated areas. In the present work, the two processes were decoupled to investigate the interaction effects of laser radiation type 316L. The surface residual stress, hardness, and microstructure of milled flat specimens were measured prior to and after diode-generated laser beam irradiation. Laser exposure of samples was conducted under protective gas shielding (Argon) using heating parameter combinations that would limit or avoid laser surface melting. Conversely, when the surface underwent melting, the formation of a fast solidification layer resulted in the removal of the cold-worked effect and the significant softening of the surface layers. Beam power density in-homogeneities and incomplete machining of the treated areas in LAM have the potential to introduce significant undesired changes on components’ surface integrity.

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“…This observation suggests that although the compact thin top surface oxide film can protect the grain body effectively, the inward diffusion of oxygen along the nano-GBs has not been effectively prevented. The enhanced oxidation along the nano-GBs is supposed to be due to the accumulation of dislocations at these regions since the dislocations can accelerate the fast diffusion of metallic and nonmetallic species and result in fast oxidation [27,[35][36][37][38][39][40][52][53][54][55][56][57][58]. Further observation shows that although the nano-GBs are preferentially oxidized, the oxidation is mainly limited in the deformation layer, and the underneath matrix has been well protected.…”

Section: The Effects Of Dislocations On Oxidationmentioning

confidence: 99%

A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

Chen

Shen

2020

Corrosion Science

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Surface, stagnant grain boundary (GB), and crack tip oxidation of Alloy 600 were studied. The mirror-finished surface oxide has a duplex structure and the formation mechanisms of each layer are discussed. A more compact oxide film is observed on the cold-worked surface, while the nano-GBs are preferentially oxidized. The crack tip oxidation rate is around four orders of magnitude faster than that of the stagnant GB, and their oxidation mechanisms are believed to be the same. Diffusion-induced grain boundary migration (DIGM) is observed around the crack and oxidized GB tips. The role of Ni expulsion on the DIGM is discussed.

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Improving the oxidation resistance of 316L stainless steel in simulated pressurized water reactor primary water by electropolishing treatment

Cited by 41 publications

References 47 publications

Characterization of the crack initiation and propagation in Alloy 600 with a cold-worked surface

Characterization of the crack initiation and propagation in Alloy 600 with a cold-worked surface

Laser Irradiation Effects in Simulated Laser-Assisted Machining of Type 316L SS

A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

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