Solidification study of cast irons formed by spray

• Grant number: 16/19326-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2016
• End date: August 31, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Claudemiro Bolfarini
• Grantee: Júlia Frasnelli Matias Fernandes
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

The spray forming is an advance casting technique that allows the manufacture of products with refined structure, equiaxed grains (non dendritic) and low levels of segregation, with any alloy. In spite of being a well known microstructure, because of its vantages, the question whether the spray forming is or isn't a fast solidification technique is still debated on the international community. The research group involved in this project has also contributed on the understanding of the mechanisms that occur during the solidification of the alloys formed by spray. This project intends to broaden that knowledge by the study of cast irons formed by this technique, knowing that the cooling rates and the solidification speed have a huge impact on the final microstructures of the alloy, obtaining either gray or white cast iron. As a result the choice of the alloy will help the understanding of the mechanism in question. The study will be made by microstructural analysis of the powder deposits and the pos overspray of three cast irons compositions with different intervals between the stable and metastable eutectic temperatures and with different primary phases. The compositions of the alloys will be chosen with the thermodynamic simulation program Thermo-Calc. (AU)