Browsing by Author "Walczak, Magdalena Marta"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Application of FFT analysis for the study of directionality of wear scars in exposure to slurry flow of varying velocity
    (2019) Molina Vergara, Nicolas Andres; Aguirre, J.; Walczak, Magdalena Marta
    The fast Fourier transform (FFT) has been used extensively in image processing for analyzing periodicity, directionality, and spacing in pattern recognition. This paper describes a procedure for applying FFT technique to images of worn surfaces produced by erosion typical to transport of slurry through tailing pipelines. Rotating cylinder electrode is used for simulating exposure of carbon steel API 5L X65 to flow of different nominal velocities under cathodic protection. Degradation is evaluated by weight loss; whereas the worn surfaces are assessed by scanning electron microscope (SEM). FFT-based analysis of the SEM images reveals that directionality of wear scars evolves with increasing velocity indicating a correlation between erosion wear rate and the condition of the turbulent flow.
  • Thumbnail Image
    Item
    Computational Fracture Mechanics: Evaluation of the Structural Integrity in a Penstock Applying the BS7910 Standard and Finite Element Analysis
    (2025) Barrionuevo Chiluiza, German Omar; Guerrero, B.A.; Walczak, Magdalena Marta
    ORCID;2025-08-22
  • Thumbnail Image
    Item
    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.