Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Effect of process parameters on the properties and microstructures of CrMnFeCoNi coatings produced by laser cladding
Submission Author:
Athos Fernandes Araujo , SC
Co-Authors:
Athos Fernandes Araujo, Claudio Poffo, Daniel Cunha, Catarina Meiko Hayashi, Felipe Martina André, Renan Luiz Santiago, Manoel Kolling Dutra, Milton Pereira
Presenter: Athos Fernandes Araujo
doi://10.26678/ABCM.COBEM2023.COB2023-1744
Abstract
The development of new materials is closely related to the evolution and technological progress of civilization. High entropy alloys are multicomponent alloys that must contain at least 5 different elements in concentrations ranging from 5% to 35% and that present configurational entropy greater than 12.4 J/mol.K. They have gained prominence due to their unique properties such as high mechanical strength, good ductility and toughness, and corrosion resistance that enable a wide variety of applications when compared to conventional metallic alloys. This new class of metallic materials is being studied and recently produced via laser cladding. The technique using a laser beam to melt a thin layer of metallic powders to form a coating on the surface of a substrate. Rapid cooling promotes the solidification of a uniform layer of 0.1 to 2 mm, forming a bonding zone between the substrate and coating. This cast zone has high quality, little roughness and porosity, a small heat-affected zone and minimal distortions. This work aims to find the best operational parameters, varying the laser power and the scanning speed during the melting step of a high entropy alloy composed of high purity metallic Cr, Mn, Fe, Co and Ni powders in near-equiatomic proportions, which were weighed and mixed. A thin and uniform layer of the powder mixture was deposited on a 1020 steel bar (low carbon steel with excellent cost-effectiveness and widely used in the manufacture of fasteners and also in the automobile industry). The laser cladding process was used to selectively melt the powder and promote the formation of the high entropy coating on the substrate. Thus, the structural, mechanical and microstructural properties of the coatings resulting from laser melting were evaluated. X-ray diffraction tests (DRX) were carried out to identify the existing phases. Mechanical characterization through Vickers microhardness of coatings and substrate. As well as optical and scanning electron microscopies.
Keywords
LASER Cladding, High entropy alloy, characterization, CrMnFeCoNi, Coatings
