In situ observation of anisotropic tribological contact evolution in 316L steel formed by selective laser melting

Bahshwan, Mohanad; Gee, M G; Nunn, John; Myant, Connor; Reddyhoff, Tom

doi:10.1016/j.wear.2021.204193

Cited by 14 publications

(8 citation statements)

References 40 publications

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“…Figure 7 presents a series of the typical (111) pole figures derived from EBSD data, which were plotted for heat-treated and ECAP processed samples. According to the notation proposed by Toth [38], the heat-treated sample on the XY plane demonstrated the major {011}< 100 > Goss and minor {001}< 100 > cube texture components, shown in Figure 7a, which is typical for the bi-directional scanning strategy [39]. Taking into account the side surface (XZ plane), elongated grains oriented along the building direction formed, shown in Figure 5c, which resulted in an increased preferred fiber texture composed of {011}<112> (brass) orientations, shown in Figure 7b.…”

Section: Microstructure Characterizationmentioning

confidence: 97%

Evolution of Microstructure, Texture and Corrosion Properties of Additively Manufactured AlSi10Mg Alloy Subjected to Equal Channel Angular Pressing (ECAP)

et al. 2022

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In the selective laser melting process (SLM), the region irradiated by the laser beam is melted and quickly solidified, forming solidification lines (laser scan tracks) with symmetrical shapes. Because of the unique (rapid) crystallization conditions, the subgrain structures, typically observed inside these solidification lines, could also have variable geometric symmetrical patterns, e.g., cellular, pentagonal, or hexagonal cellular. The existence of such distinctive microstructures in SLM-made alloys has a significant impact on their superior mechanical and corrosion properties. Thus, any modification of this symmetrical microstructure (due to post-processing) can degrade or improve the properties of SLM-fabricated alloys. This study presents the experimental results on the effects of heat treatment and ECAP on microstructure modification and corrosion behavior of SLM-fabricated AlSi10Mg alloy. Light microscopy, scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and X-ray diffraction (XRD) were used for microstructural analysis. The corrosion properties of the given samples were determined using open-circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) techniques. EBSD observations showed that the imposed strain resulted in an obvious reduction in grain size to ~1.42 µm and ~0.24 µm after the first and second ECAP passes, respectively. Electrochemical tests revealed that the corrosion resistance of the ECAP-processed AlSi10Mg alloy improved significantly, which was confirmed by a nobler Ecorr and lower Icorr values, and higher polarization resistance. The final results indicated that the strain-induced crystalline defects provided more nucleation sites for the formation of a denser and thicker oxide film, thus enhancing the corrosion resistance of the AlSi10Mg alloy.

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Section: Microstructure Characterizationmentioning

confidence: 97%

Evolution of Microstructure, Texture and Corrosion Properties of Additively Manufactured AlSi10Mg Alloy Subjected to Equal Channel Angular Pressing (ECAP)

et al. 2022

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“…If a constant strategy is used (without rotations), an ordered stacking of molten pools would be obtained and a completely anisotropic material would be designed, as observed in the results obtained by Yang et al [50]. The studies of Bahshwan et al [51,52] highlighted that the sudden changes in laser energy density occur at the end of the laser path, causing more porosity at the beginning and end of scan lines. In addition, Salman et al [26] conclude that the highest densification is obtained with a unidirectional pattern as long as the contour is previously scanned since the contour acts as a limit for heat transfer.…”

Section: Discussionmentioning

confidence: 97%

Influence of the Processing Parameters on the Microstructure and Mechanical Properties of 316L Stainless Steel Fabricated by Laser Powder Bed Fusion

Barrionuevo,

Ramos-Grez,

Sánchez-Sánchez

et al. 2024

JMMP

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Complex thermo-kinetic interactions during metal additive manufacturing reduce the homogeneity of the microstructure of the produced samples. Understanding the effect of processing parameters over the resulting mechanical properties is essential for adopting and popularizing this technology. The present work is focused on the effect of laser power, scanning speed, and hatch spacing on the relative density, microhardness, and microstructure of 316L stainless steel processed by laser powder bed fusion. Several characterization techniques were used to study the microstructure and mechanical properties: optical, electron microscopies, and spectrometry. A full-factorial design of experiments was employed for relative density and microhardness evaluation. The results derived from the experimental work were subjected to statistical analysis, including the use of analysis of variance (ANOVA) to determine both the main effects and the interaction between the processing parameters, as well as to observe the contribution of each factor on the mechanical properties. The results show that the scanning speed is the most statistically significant parameter influencing densification and microhardness. Ensuring the amount of volumetric energy density (125 J/mm3) used to melt the powder bed is paramount; maximum densification (99.7%) is achieved with high laser power and low scanning speed, while hatch spacing is not statistically significant.

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“…A heterogeneous hardness leads to non-uniform mechanical properties which can particularly affect the tribological properties of the surface. Studies on the Laser-PBF process showed anisotropic wear behavior of as-build pieces and presented better mechanical properties than conventional process [29,30,52]. Those results open the possibility to tailor optimized hardness patterns by playing with the scanning path.…”

Section: Coatings Hardnessmentioning

confidence: 90%

Surface microstructure of an IN718 3D coating manufactured by Laser Metal Deposition

Zurcher,

Fridrici,

Charkaluk

2023

Materials Characterization

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In situ observation of anisotropic tribological contact evolution in 316L steel formed by selective laser melting

Cited by 14 publications

References 40 publications

Evolution of Microstructure, Texture and Corrosion Properties of Additively Manufactured AlSi10Mg Alloy Subjected to Equal Channel Angular Pressing (ECAP)

Evolution of Microstructure, Texture and Corrosion Properties of Additively Manufactured AlSi10Mg Alloy Subjected to Equal Channel Angular Pressing (ECAP)

Influence of the Processing Parameters on the Microstructure and Mechanical Properties of 316L Stainless Steel Fabricated by Laser Powder Bed Fusion

Surface microstructure of an IN718 3D coating manufactured by Laser Metal Deposition

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