Papers by Author: Edilson Rosa Barbarosa Jesus

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Authors: Edilson Rosa Barbarosa Jesus, Jesualdo Luiz Rossi
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Authors: M.M. Serna, Edilson Rosa Barbarosa Jesus, E. Galego, Luís Gallego Martinez, H.P.S. Corrêa, Jesualdo Luiz Rossi
Abstract: The aim of the work was to prepare an overview about the microstructures present in high-speed steel, focused on the crystallography of the carbides. High-speed steels are currently obtained by casting, powder metallurgy and more recently spray forming. High-speed steels have a high hardness resulting from a microstructure, which consists of a steel matrix (martensite and ferrite), in which embedded carbides of different crystal structure, chemical composition, morphology and size, exist. These carbides are commonly named MxC, where M represents one or more metallic atoms. These carbides can be identified by X-ray diffraction considering M as a unique metallic atom. In this work, it is discussed, in basis of the first principles of physics crystallography, the validation of this identification when it is considered that other atoms in the structure are substitutional. Further, it is discussed some requirements for data acquisition that allows the Rietveld refinement to be applied on carbide crystallography and phase amount determination.
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Authors: R.M. Lima, Edilson Rosa Barbarosa Jesus, Jesualdo Luiz Rossi
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Authors: Edilson Rosa Barbarosa Jesus, E.S. Jesus Filho, Jesualdo Luiz Rossi
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Authors: E.S. Jesus Filho, Edilson Rosa Barbarosa Jesus, A.H.P. Andrade, Jesualdo Luiz Rossi
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Authors: Lucio Salgado, E.S. Jesus Filho, Edilson Rosa Barbarosa Jesus, Francisco Ambrozio Filho, Jesualdo Luiz Rossi, J.A. Santos, Marco Antonio Colosio
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Authors: Edilson Rosa Barbarosa Jesus, E.S. Jesus Filho, Jesualdo Luiz Rossi
Abstract: Machining tools (interchangeable inserts) were manufactured from spray formed AISI M2 high-speed steel. The spray formed materials were mechanical and microstructural characterised. An assessment of the machining performance of the spray formed high-speed steel was attained. These results were compared to materials obtained by conventional and powder metallurgy techniques. The results showed that under the used process conditions (hot rolling and heat treating), the spray formed material showed a machining behaviour near closed to other materials; and highlight the potential of the spray forming technique for the obtention of materials with adequate properties for machining tools manufacturing.
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Authors: E.S. Jesus Filho, Edilson Rosa Barbarosa Jesus, Lucio Salgado, S.L. Jesus, Marco Antonio Colosio, José Carlos Santos, S. Yoshida, C.H. Sartori, Jesualdo Luiz Rossi
Abstract: This work presents aspects related to new sintered materials for valve seat inserts application. Two types of materials were evaluated. The materials were made using powder metallurgy technique from a basic mixture of high-speed steel (AISI M3/2), iron and carbide powders. The microstructures of these materials before and after heat treatment are presented. Under the heat treatment condition, the activation of the diffusion mechanism among phases was promoted and a better distribution of the Cu phases along the matrix was achieved. The results indicate that the materials under development have a potential for commercial application as valve seat inserts.
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