Microstructure effect on sliding wear of 316L stainless steel selectively laser melted

Barrionuevo, Germán Omar; Walczak, Magdalena; Ramos-Grez, Jorge; Mendez, Patricio; Debut, Alexis

doi:10.1177/02670836231217393

Cited by 3 publications

(2 citation statements)

References 53 publications

(78 reference statements)

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“…The microstructure of a material is directly connected to its mechanical properties. In the context of additively manufactured samples, the yield strength, microhardness, and wear resistance are significantly influenced by the characteristics of the grains and sub-grains, as recently reported in [46,47]. Figure 9 shows a representative indentation response of the austenitic stainless steel beneath a molten pool.…”

Section: Microhardnessmentioning

confidence: 72%

“…In laser powder bed fusion, the generation of high thermal gradients (10 6 K/m) and ultra-fast cooling rates (10 6 K/s) [6] manifests as cellular/dendritic microstructures, exemplified in Figure 8b. The cellular microstructure favors the accumulation of dislocations in the subgrains, which increases the strength and hardness of the materials processed by LPBF [46].…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Microhardnessmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

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

Self Cite

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Tribological Behavior of 316L Stainless Steel Fabricated Using Metal Extrusion Additive Manufacturing Under Dry and Simulated Body Fluid‐Lubricated Conditions

Zhou,

Yang,

Zhu

et al. 2024

Adv Eng Mater

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Herein, the tribological behavior of 316L stainless steel (SS) fabricated using metal extrusion additive manufacturing (MEAM) is investigated both under dry and simulated body fluid (SBF)‐lubricated conditions. The results and mechanisms are compared with those of 316L SS fabricated via selective laser melting (SLM) and hot rolling (HR). Under dry‐friction conditions, the 316L SS fabricated via MEAM shows inferior tribological performance compared with those fabricated via SLM and HR, primarily because of its lower initial hardness and better plasticity, which increase both abrasive and adhesive wear. Under SBF‐lubricated conditions, the tribological performance of the 316L SS fabricated via MEAM is comparable to that fabricated via HR and superior to that fabricated via SLM. The wear rate of the MEAM‐fabricated 316L SS is 16.8% and 3.2% lower than SLM‐ and HR‐fabricated, respectively. The numerous pores on 316L SS serve as traps for wear particles, which contribute to the reduction of three‐body wear. In terms of wear under SBF‐lubricated conditions, MEAM technology appears to be a promising method for the fabrication of customized 316L orthopedic implants.

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Influence of re-melting rate on the dry sliding wear characteristics of LPBFed Cu–Cr–Zr alloy

Saravana Kumar,

Jeyaprakash,

Yang

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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For the past few decades, Copper alloys have made significant contributions to a variety of industrial applications due to their efficient electrical and thermal conductivity. However, moving mechanical assemblies continues to raise concerns about wear-related mechanical breakdowns on a worldwide scale. Hence, this research focuses on examining the wear parameters such as load, sliding velocity and distance based on the re-melting strategy of the (Laser Powder Bed Fusion) LPBF process. The sliding tests were carried out over a wide range load (15, 25, 35 and 45 N), sliding velocity (1, 1.5, 2 and 2.5 m/s) and sliding distance (1500, 2500, 3500 and 4500 m) with a pin-on-disc configuration. The LPBFed Cu–Cr–Zr alloy coupon was printed with four different re-melting ranges (5, 15, 30 and 45%) and it was explored to minimise the occurrence of un-melted particles and inter-particle gaps. The wear results show that the wear parameters have a positive correlation with the Wear Rate (WR) and co-efficient of friction (COF) and also witnessed that the WR and COF decrease with increasing the re-melting rate. The nano-hardness analysis was compared on the un-melted and spattered particles and the re-melted surface. The results show that the spattered particles possess 35.8% more nano-hardness than the other surface on the Cu alloy coupon printed with a 45% re-melting range. The FE-SEM images of the worn-out surface reveal that un-melted and spattered particles have a major contribution in reducing the wear resistance of the printed Cu alloy coupons.

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Microstructure effect on sliding wear of 316L stainless steel selectively laser melted

Cited by 3 publications

References 53 publications

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

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

Tribological Behavior of 316L Stainless Steel Fabricated Using Metal Extrusion Additive Manufacturing Under Dry and Simulated Body Fluid‐Lubricated Conditions

Influence of re-melting rate on the dry sliding wear characteristics of LPBFed Cu–Cr–Zr alloy

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