Effect of Laser Remelting on the Microstructure and Erosion-Corrosion Resistance of NbC Thermal Spray Coatings
| Autor: | Hipólito Carvajal Fals, Angel Sanchez Roca, João Batista Fogagnolo, Leonardo Fanton, Maria Júlia Xavier Belém, Carlos Roberto Camello Lima |
|---|---|
| Rok vydání: | 2019 |
| Zdroj: | International Thermal Spray Conference. |
| ISSN: | 2768-1505 2768-1491 |
| DOI: | 10.31399/asm.cp.itsc2019p0086 |
| Popis: | In this study, NbC coatings, 250 µm thick, were deposited by low-velocity flame spraying on stainless steel substrates and were laser remelted in a controlled argon atmosphere. Isolated passes transverse of the coatings were performed at different focal lengths at speeds of 10, 15, and 20 mm/min. Using the selected laser parameters, layers were recast with eight passes at 10% superposition. Erosion-corrosion tests were performed and coating surfaces and cross-sections were characterized via SEM, EDS, and XRD analysis. Modified surfaces of dense, 800-µm thick coatings with no defects and excellent metallurgical bonding with the substrate were obtained. It was found that dilution of the coating with the substrate formed a gradient of chemical composition and mechanical properties and that erosive-corrosive wear resistance was highest for an erodent impact angle of 90°. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|