Analysis of the microstructural influence by laser cutting velocity

Abstract

This research evaluates the influence of the CO2 laser cutting velocity in the heat-affected zone in a low- carbon steel. The control of laser cutting parameters is essential to ensure that the properties required in the material have not been affected, and avoid additional grinding processes on the cut surfaces. Morphologic, mechanic and microstructural tests were used to prove the influence of cutting process and its velocity on heat-affected zone. Transformation from ferritic into pearlitic structure and reduction in grain size were analyzed. Also, was evaluated a rise in hardness due to phase transformation. Better cutting conditions were evidenced in samples using a cutting velocity of 80 mm/s because the mean hardness obtained allow infer a good relation of properties and a smaller heat affected zone.

Paramos in Peril: case study on a blue gold hotspot of central Colombia

“…This study aims to quantify changes in LULC in Colombia's paramos, focusing on the densely inhabited central region, home to the Guerrero and Rabanal paramos. This area has experienced rapid expansions in both agriculture and coal mining activities since the 1940s [31]. Utilizing Landsat and Sentinel-2 images from 1984 to 2021, a comprehensive change detection analysis is conducted, focusing on quantifying native paramo vegetation loss, including frailejones.…”