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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Study on the Microstructure and Liquid Phase Formation in a Semisolid Gray Cast Iron

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Author(s):
Benati, Davi Munhoz ; Ito, Kazuhiro ; Kohama, Kazuyuki ; Yamamoto, Hajime ; Zoqui, Eugenio Jose
Total Authors: 5
Document type: Journal article
Source: 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
Abstract

The development of high-quality semisolid raw materials requires an understanding of the phase transformations that occur as the material is heated up to the semisolid state, i.e., its melting behavior. The microstructure of the material plays a very important role during semisolid processing as it determines the flow behavior of the material when it is formed, making a thorough understanding of the microstructural evolution essential. In this study, the phase transformations and microstructural evolution in Fe2.5C1.5Si gray cast iron specially designed for thixoforming processes as it was heated to the semisolid state were observed using in situ high-temperature confocal laser scanning microscopy. At room temperature, the alloy has a matrix of pearlite and ferrite with fine interdendritic type D flake graphite. During heating, the main transformations observed were graphite precipitation inside the grains and at the austenite grain boundaries; graphite flakes and graphite precipitates growing and becoming coarser with the increasing temperature; and the beginning of melting at around 1413 K to 1423 K (1140 A degrees C to 1150 A degrees C). Melting begins with the eutectic phase (i.e., the carbon-rich phase) and continues with the primary phase (primary austenite), which is consumed as the temperature increases. Melting of the eutectic phase composed by coarsened interdendritic graphite flakes produced a semi-continuous liquid network homogeneously surrounding and wetting the dendrites of the solid phase, causing grains to detach from each other and producing the intended solid globules immersed in liquid. (AU)

FAPESP's process: 15/06965-3 - In situ observation of Fe-2.5C-xCr-1.5Si hypoeutectic cast irons at the semisolid state
Grantee:Davi Munhoz Benati
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 11/19997-0 - Effect of chromium in the thixoformability of hipoeutetic cast iron
Grantee:Davi Munhoz Benati
Support type: Scholarships in Brazil - Doctorate