Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
TRIBOLOGICAL EVALUATION OF NI-CR-B-SI COATINGS DEPOSITED BY LASER METAL DEPOSITION AND TREATED BY LASER REMELTING
Submission Author:
Jurandir Sousa , PA
Co-Authors:
Jurandir Sousa, Adriano de Souza Pinto Pereira, Rafael Gomes Nunes Silva, Calil Amaral, Milton Pereira
Presenter: Calil Amaral
doi://10.26678/ABCM.COBEM2019.COB2019-1489
Abstract
Industrial development is constantly opposed by problems related to wear mechanisms action. Among these, it is possible to emphasize adhesive wear, responsible for generating financial losses in several sectors. One way to reduce this loss has been the wear resistant clads application, usualy composed by alloys with dedicated properties and deposited by processes capable of delivering the desired characteristics. Ni-based alloys coatings deposited via laser metal depostion (LMD) have been know to performed well in this scenario, increasing components life time and consequently reducing production and repair costs. Although most of these coatings already present good results in its microstructure, hardness and tribological behavior, some can be improved by post-deposition treatments, such as laser remelting. In this ambit, the present article compares and analyses the tribological behavior of a Ni-Cr-B-Si coating deposited by LMD and its laser remelted equivalent. The coatings’ occurence of superficial macro defects, their microhardness and tribological performance in the ASTM G99 test were compared. Friction coefficients (load cell), volumetric loss (optical interferometry), Archard's coefficients and worn surfaces, analysed via SEM and EDX, were evaluated. Results show that the laser remelting treatment was effective in reducing surface cracks, increasing hardness and reducing friction coefficient and volumetric loss.
Keywords
Adhesive Wear, Wear Resistant Coatings, Cladding, Ni-based alloys, Laser Remelting
