Effect of chromium in the thixoformability of hipoeutetic cast iron

• Grant number: 11/19997-0
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): March 01, 2012
• Effective date (End): February 29, 2016
• Field of knowledge: Engineering - Mechanical Engineering - Manufacturing Processes
• Principal researcher: Eugênio José Zoqui
• Grantee: Davi Munhoz Benati
• Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated scholarship(s): 15/06965-3 - In situ observation of Fe-2.5C-xCr-1.5Si hypoeutectic cast irons at the semisolid state, BE.EP.DR

Abstract

This project aims to study the thixoformability, ie, the potential for applications in thixoforming processes of hipoeutectic cast iron modified by chromium, with the basic composition Fe-2,5wt%C-Xwt%Cr-1%,5wt%Si. Alloys containing chromium content of 0, 2, 4 and 6wt%Cr, will be manufactured and donated to the project by the company IMBIL - Industry and Maintenance of Pumps Ltd. ITA., According to design specifications. The solidus and liquidus temperatures are determined by simulation via Thermo-Calcâ, as well as via DSC. This way it will get the temperatures to evaluate the thixoformability targets, which requires the reheating temperature of the material enough to produce 45 to 60% of solid fraction. Specimens will be subjected to heat treatments reheating to evaluate the morphological evolution. Parameters are determined: the proportion of phases, estimation of grain size / globule average size and form and spacing of graphite flakes. This characterizations are also made in the material as received. The semi-solid rheological behavior at this stage will be determined via the hot compression test. The compositions that present the best performance concerning to the morphological and rheological aspects will be thixoformed to obtain tensile test specimens to evaluate the mechanical behavior. The thixoforming tests will be evaluated in terms of die filling, porosity of the final product, roughness and surface characteristics in terms of oxide formation. (AU)

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)

BENATI, DAVI MUNHOZ; ITO, KAZUHIRO; KOHAMA, KAZUYUKI; YAMAMOTO, HAJIME; ZOQUI, EUGENIO JOSE. Study on the Microstructure and Liquid Phase Formation in a Semisolid Gray Cast Iron. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, v. 48, n. 5, p. 2293-2303, OCT 2017. Web of Science Citations: 1.

RAGAZZO, LUCAS BERTOLINO; BENATI, DAVI MUNHOZ; LOPEZ NADAL, RODOLFO; ZOQUI, EUGENIO JOSE. Obtaining Martensitic Structures during Thixoforming of Hypoeutectic Gray Cast Iron. ADVANCES IN MATERIALS SCIENCE AND ENGINEERING, 2015. Web of Science Citations: 0.