Coatings of fe-based metallic glasses and self-lubricating composites with MoS2 by laser cladding

• Grant number: 15/04062-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): June 01, 2015
• Effective date (End): September 30, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Conrado Ramos Moreira Afonso
• Grantee: Giovanna Giroto
• 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 multicomponent Fe-based metallic alloys through laser surface treatment and laser cladding in alloys processed by spray forming in the different products obtained, deposit and overspray powder, respectively. Then, it will be tested composites of the overspray amorphous powder of Fe-based mixed in different percentages with MoS2 as an self-lubricating material, in order to evaluate the possible increase of wear resistance through the diminishing of friction coefficient of the coating. 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) and Center of Characterization and Development of Materials (CCDM) together with the research labs of DEMa/UFSCar and our research group. The main techniques used in this work will be X-ray diffraction, thermal analysis, scanning and transmission electron microscopy coupled to energy dispersive spectroscopy. The Vickers microhardness will be used in order to monitor the variation of mechanical properties of the samples in different process parameters upon laser surface treatment.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GIROTO, GIOVANA; GARGARELLA, PITER; RIVA, RUDIMAR; KIMINAMI, CLAUDIO SHYINTI; DE CARVALHO, MARCOS FERNANDES; MOREIRA AFONSO, CONRADO RAMOS. Laser Cladding of Fe-based Metallic Glass/MoS2 Self-lubricating Composites: Effect of Power and Scanning Speed. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 20, n. 2, p. 836-841, 2017. (13/05987-8, 14/13432-9, 15/04062-6, 12/18429-0)