Enhanced irradiation and corrosion resistance of 316LN stainless steel with high densities of dislocations and twins

Chen, Xudong; Li, Yusheng; Zhu, Yuntian; Yang, Bin

doi:10.1016/j.jnucmat.2019.02.016

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…Higher Cr and Mo content, precipitates, and dislocations coexist at the cell walls, each with potentially contrasting effects on corrosion. For example, in one report, 99 a high density of dislocations accelerated the corrosion of austenitic SS in 3.5 wt% NaCl solution, while, in another report, 115 reducing passive film defects and increasing the pitting potential based on the same solution. While both contradictory studies used austenitic steel, the chemical composition and method of dislocation multiplication differed.…”

Section: Sub-grain Structuresmentioning

confidence: 99%

Pitting Corrosion in 316L Stainless Steel Fabricated by Laser Powder Bed Fusion Additive Manufacturing: A Review and Perspective

Voisin

Shi

Zhu

et al. 2022

JOM

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Abstract316L stainless steel (316L SS) is a flagship material for structural applications in corrosive environments, having been extensively studied for decades for its favorable balance between mechanical and corrosion properties. More recently, 316L SS has also proven to have excellent printability when parts are produced with additive manufacturing techniques, notably laser powder bed fusion (LPBF). Because of the harsh thermo-mechanical cycles experienced during rapid solidification and cooling, LPBF processing tends to generate unique microstructures. Strong heterogeneities can be found inside grains, including trapped elements, nano-inclusions, and a high density of dislocations that form the so-called cellular structure. Interestingly, LPBF 316L SS not only exhibits better mechanical properties than its conventionally processed counterpart, but it also usually offers much higher resistance to pitting in chloride solutions. Unfortunately, the complexity of the LPBF microstructures, in addition to process-induced defects, such as porosity and surface roughness, have slowed progress toward linking specific microstructural features to corrosion susceptibility and complicated the development of calibrated simulations of pitting phenomena. The first part of this article is dedicated to an in-depth review of the microstructures found in LPBF 316L SS and their potential effects on the corrosion properties, with an emphasis on pitting resistance. The second part offers a perspective of some relevant modeling techniques available to simulate the corrosion of LPBF 316L SS, including current challenges that should be overcome.

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Section: Sub-grain Structuresmentioning

confidence: 99%

Pitting Corrosion in 316L Stainless Steel Fabricated by Laser Powder Bed Fusion Additive Manufacturing: A Review and Perspective

Voisin

Shi

Zhu

et al. 2022

JOM

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“…The diffraction peak of Mg (112̅0) phase shifted slightly (∼0.048°) toward the higher angle direction after fs-LSP, as compared to the untreated WE43 (indicated by arrows in Figure b), which could be related to the formation of lattice strain at the surface . In addition, the full width at half-maximum (FWHM) of this diffraction peak exhibited a slight broadening (∼0.271°) for the fs-LSP sample than that (∼0.261°) of the untreated WE43, which is typically caused by grain refinement, or generation of high dislocation density and residual stress at the surface. , The AFM surface topography of the samples is presented in Figure a,b and the corresponding surface roughness ( R a ) in Figure c. It can be seen that R a increased after fs-LSP treatment due to the formation of ripples.…”

Section: Resultsmentioning

confidence: 93%

“…48 In addition, the full width at halfmaximum (FWHM) of this diffraction peak exhibited a slight broadening (∼0.271°) for the fs-LSP sample than that (∼0.261°) of the untreated WE43, which is typically caused by grain refinement, or generation of high dislocation density and residual stress at the surface. 49,50 The AFM surface topography of the samples is presented in Figure 4a,b and the corresponding surface roughness (R a ) in Figure 4c. It can be seen that R a increased after fs-LSP treatment due to the formation of ripples.…”

Section: Resultsmentioning

confidence: 99%

Enabling High-Performance Surfaces of Biodegradable Magnesium Alloys via Femtosecond Laser Shock Peening with Ultralow Pulse Energy

Wang

Hung

Howe

et al. 2021

ACS Appl. Bio Mater.

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The fast degradation rate and poor wear resistance of magnesium (Mg) alloys in physiological environments have limited their potential usage as next-generation biodegradable orthopedic implant materials. In this work, femtosecond laser shock peening (fs-LSP) was successfully applied to simultaneously improve the surface mechanical, corrosion, and tribocorrosion properties of WE43 Mg alloys in blood bank buffered saline solution at body temperature. Specifically, the treated surfaces of WE43 Mg alloys via fs-LSP with ultralow pulse energy were investigated under different power densities, confining mediums, and absorbent materials. It was found that the combination of a black tape and a quartz layer gave the optimum peening effect under a power density of 28 GW/cm 2 , which simultaneously strengthened the surface and reduced the corrosion kinetics. In addition, a rapid self-repassivation was observed in fs-LSP-treated WE43 surfaces during tribocorrosion, promising sustained corrosion resistance under mechanical loading, critical to the reliability of load-bearing implants. Finally, the subsurface microstructural evolution and residual stress development in WE43 after fs-LSP were discussed based on the results from transmission electron microscopy analysis and finite element simulations.

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“…The high corrosion resistance of stainless steel is known to stem from the formation of a Cr-enriched passive film, which protects the matrix from corrosion attack [ 24 ]. The highly enhanced Cr diffusivity of the nanograined surface promotes the formation of a thick passive film ( Figure 4 ).…”

Section: Discussionmentioning

confidence: 99%

Enhanced Pitting Corrosion Resistance of Nanostructured AISI 304 Stainless Steel via Pipe Inner Surface Grinding Treatment

et al. 2023

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By means of a pipe’s inner surface grinding, a single-phase nanostructured austenite was formed on the surface of an AISI 304 stainless steel. The electrochemical corrosion behavior was compared with a coarse-grained counterpart of identical surface roughness. Experimental results show that the nanostructured austenite shows a higher pitting potential and a wider passivation interval than those of its coarse-grained counterpart. The enhanced corrosion resistance was attributed to the fast diffusion of Cr within the nanostructure and, hence, the formation of a thicker passive film to efficiently protect the surface against the ion attack. This work provides insights into a simple processing method to improve the surface strength and pitting resistance of stainless steel.

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Enhanced irradiation and corrosion resistance of 316LN stainless steel with high densities of dislocations and twins

Cited by 14 publications

References 36 publications

Pitting Corrosion in 316L Stainless Steel Fabricated by Laser Powder Bed Fusion Additive Manufacturing: A Review and Perspective

Pitting Corrosion in 316L Stainless Steel Fabricated by Laser Powder Bed Fusion Additive Manufacturing: A Review and Perspective

Enabling High-Performance Surfaces of Biodegradable Magnesium Alloys via Femtosecond Laser Shock Peening with Ultralow Pulse Energy

Enhanced Pitting Corrosion Resistance of Nanostructured AISI 304 Stainless Steel via Pipe Inner Surface Grinding Treatment

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