Laser cladding coatings of atomized powders of Fe-Nb-B and Ni-Nb nanocrystaline alloys

• Grant number: 18/14104-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): September 01, 2018
• Effective date (End): August 31, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Conrado Ramos Moreira Afonso
• Grantee: Argos Soares Silva
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys, AP.TEM

Abstract

The laser processing of advanced metallic materials brings a lot of advantages when compared with the conventional processing routes of metallic materials, such as, increasing of productivity, reduction in operational costs, quality improvement and finishing of products, wider flexibility in production lines and amplifying project possibilities and application opportunities. The surface treatments through laser that result in phase transformations solid state and the production of coatings for advanced applications in order to improve wear and corrosion resistance, are characterized as one of the main materials processing alternatives that brings together the possibility of obtaining, refined microstructures, metastable, nano and quasicrystalline and amorphous structure, with significant improvements in properties of metallic alloys when compared with commercial alloys or crystalline slowly solidified though conventional metallurgical processing routes. The objective of this project is the obtaining of amorphizable and nanocrystalline coatings of Fe-Nb-B and Ni-Nb alloys through laser cladding and laser surface treatment (laser remelting) for the alloys processed by gas atomization and copper mold casting (CMC), respectively. The execution of this proposal through collaborations with experienced research groups in the theme to be development and will be associated to the possibility de establish a new research area at the DEMa/UFSCar. The microstructure characterization of these materials processed by laser will be facilitated due to the infrastructure offered by the Laboratory of Structural Characterization (LCE) together with the research labs of DEMa/UFSCar and our research group. The main techniques used in this work will be X-ray diffraction (DRX), optical microscopy (OM) thermal analysis (DSC), scanning (SEM) and transmission electron microscopy (TEM) coupled to energy dispersive spectroscopy (EDS), besides measurements of Vickers microhardness of laser cladding coatings.