About metastable cellular structure in additively manufactured austenitic stainless steels

Kong, Decheng; Wei, Shaolou; Ni, Xiaoqing; Zhang, Liang; Li, Ruixue; Wang, Li; Cheng, Ming; Li, Yong

doi:10.1016/j.addma.2020.101804

Cited by 112 publications

(73 citation statements)

References 173 publications

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“…It further suggests that the reduced stacking fault contribute to the twinning nucleation and dislocation dissociation when hierarchical twin interacts with the MCS [46]. As expected, the dislocation structures are associated with variation of SFE due to the local chemical fluctuation in the MCS [11,15,25]. Burgers vector in red in Figure 7b indicates that the immobile stair-rod dislocations are generated via a 6 [121] + a 6 112 → a 6 011 , which are known as Lomer-Cottrell locks [50,51].…”

Section: Resultssupporting

confidence: 61%

Section: Resultssupporting

confidence: 60%

“…For instance, Morris et al [2] reported that MCSs are endowed with elemental segregations, a high density of dislocations and Mn-enriched SiO 2 precipitates along the cellular boundary. Other works revealed MCSs are embedded with Cr or Mo-Cr enriched precipitates [15]. Bertsch et al [14] found that a MCS has micro-segregation networks superimposed on dislocation structures without observable precipitates.…”

Section: Introductionmentioning

confidence: 98%

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The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel

Wei

2021

Nanomaterials

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Metastable cellular structures (MCSs) play a crucial role for the mechanical performance in concentrated alloys during non-equilibrium solidification process. In this paper, typifying the heterogeneous 316L stainless steel by laser additive manufacturing (LAM) process, we examine the microstructures in cellular interiors and cellular boundaries in detail, and reveal the interactions of dislocations and twins with cellular boundaries. Highly ordered coherent precipitates present along the cellular boundary, resulting from spinodal decomposition by local chemical fluctuation. The co-existences of precipitates and high density of tangled dislocations at cellular boundaries serve as walls for extra hardening. Furthermore, local chemical fluctuation in MCSs inducing variation in stacking fault energy is another important factor for ductility enhancement. These findings shed light on possible routines to further alter nanostructures, including precipitates and dislocation structures, by tailoring local chemistry in MCSs during LAM.

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Section: Resultssupporting

confidence: 61%

Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 98%

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The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel

Wei

2021

Nanomaterials

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“…It has yet to be confirmed whether these rapid solidification structures are cells or dendrites. Several authors have reported a preferential elongation of the cells along the h001i direction, 18,75,112 indicative of dendritic growth. However, in this article, we will refer to these features as cells, or the cellular structure, for ease of reading.…”

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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“…Zhang et al (Ref 12) found that the corrosion resistance of IN718 fabricated using WAAM was lower than that of wrought alloy, which was due to the presence of a high percentage of porous and less protective NiO in the passive film, which formed on the surface of WAAM IN718. Research on the corrosion behaviors of SLM alloys remains in its infancy ( Ref 23,24). Thus, further research is needed to better elucidate the effect of SLM on the corrosion behavior of materials.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of a Selective Laser Melted Inconel 718 Alloy in a 3.5 wt.% NaCl Solution

Tang

Shen

Qiao

et al. 2021

J. of Materi Eng and Perform

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The corrosion behavior of an Inconel 718 alloy fabricated using the selective laser melting (SLM) technique in a 3.5 wt.% NaCl solution is determined. The corrosive effect of the NaCl solution on the Inconel 718 alloy is investigated using potentiodynamic polarization curve measurements, Mott-Schottky plots, electrochemical impedance spectroscopy, atomic force microscopy, and x-ray photoelectron spectroscopy (XPS) and is compared with that on a commercially rolled Inconel 718 alloy (R 718). Electrochemical results suggest that the application of SLM to the Inconel 718 alloy lowers its corrosion resistance. The passive films formed on both alloys show p-type and n-type semiconductor behaviors. However, the concentrations of the defects in the passive films formed on the surface of the SLM Inconel 718 alloy are higher than those on the surface of the commercially rolled R 718. XPS shows that the passive film formed on the SLM Inconel 718 alloy has a higher NiO content, leading to the deterioration of its protective properties.

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About metastable cellular structure in additively manufactured austenitic stainless steels

Cited by 112 publications

References 173 publications

The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel

The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel

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

Corrosion Behavior of a Selective Laser Melted Inconel 718 Alloy in a 3.5 wt.% NaCl Solution

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