Browsing by Author "Debut, Alexis"

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    Experimental and numerical investigation of sliding wear of heat-treated 316L stainless steel additively manufactured
    (2024) Barrionuevo, German Omar; Calvopina, Hector; Debut, Alexis; Perez-Salinas, Cristian
    Additive manufacturing (AM) of metal alloys using a laser as a machine tool is reaching levels of precision comparable to conventional processing methods. Stainless steel specimens fabricated by AM have been extensively evaluated in load-bearing applications, showing an adequate response concerning mechanical strength. However, research on wear behavior remains open to discussion. The present work evaluates the sliding wear response of 316L stainless steel fabricated by laser powder bed fusion in three conditions: (1) as-built, (2) stressrelieved at 550degree celsius, and (3) heat-treated at 1150degree celsius. A pin-on-disk tribometer and a nanoindentation tester were employed to assess the tribological response and compare it with the same cold drawing material. The wear track and volume loss were evaluated using a 3D surface profile meter. Furthermore, the finite element method was applied to validate the experimental results and obtain insights into the behavior of the pin and disk couple. The results show that the samples in the as-built condition exhibit higher wear resistance associated with higher hardness. Stress relief slightly alters the wear response, while heat treatment modifies the microstructure, reducing the sliding wear resistance. The wear of the heat-treated samples cannot be attributed to a single wear mechanism, a synergy between several sub-mechanisms, such as abrasion, adhesion, oxidation, and tribochemical reactions.
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    Microstructure effect on sliding wear of 316L stainless steel selectively laser melted
    (2024) Barrionuevo Chiluiza, German Omar; Walczak, Magdalena Marta; Ramos Grez, Jorge; Mendez, Patricio; Debut, Alexis
    Due to varying thermal cycles, the resulting microstructure of metal additive manufacturing differs from the conventionally processed counterpart alloys. Since the mechanical properties depend on the microstructure, the wear resistance of components manufactured by laser powder bed fusion (LPBF) is determined by the processing parameters. This work focuses on microhardness and sliding wear of 316L stainless steel, evaluated nanoindentation and pin-on-disc, respectively, analysed through optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and glow discharge emission spectrometry (GDOES). The results show that the LPBF-processed specimens have about 40% higher microhardness and ca. 30% lower wear rate than the wrought counterpart. The enhanced sliding wear resistance is associated with the higher density of dislocations at the cellular subgrain boundaries.
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    Microstructure simulation and experimental evaluation of the anisotropy of 316 L stainless steel manufactured by laser powder bed fusion
    (2023) Omar Barrionuevo, German; Ramos Grez, Jorge; Walczak, Magdalena; Sanchez-Sanchez, Xavier; Guerra, Carolina; Debut, Alexis; Haro, Edison