Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Antônio Augusto Couto"'
Autor:
Tarcila Sugahara, Antônio Augusto Couto, Miguel Justino Ribeiro Barboza, Francisco Piorino Neto, Renata Jesuina Takahashi, Danieli Aparecida Pereira Reis
Publikováno v:
Materials Research, Vol 25 (2021)
Abstract Over the years, the demand for high engine efficiency has resulted in the development of new generation superalloys with improved elevated temperature properties, especially creep resistance. This study aimed to evaluate creep and mechanical
Externí odkaz:
https://doaj.org/article/5a1994f9634e4078b5272a018baa0651
Autor:
Adriano Gonçalves dos Reis, Danieli Aparecida Pereira Reis, Antônio Jorge Abdalla, Antônio Augusto Couto, Jorge Otubo
Publikováno v:
Materials Research, Vol 20, Iss suppl 2, Pp 2-9 (2017)
Plasma nitriding of a solution annealed and aged 300 grade maraging steel was studied aiming to increase the creep resistance. The surface microhardness reached 1,140 HV, producing 50 µm layer composed of ε-Fe3N and γ'-Fe4N nitrides at the uppermo
Externí odkaz:
https://doaj.org/article/b3305d2b10ed4f13b62268ed8e46b835
Autor:
Mauricio Silva Nascimento, Antônio Tadeu Rogério Franco, Carlos Frajuca, Francisco Yastami Nakamoto, Givanildo Alves dos Santos, Antônio Augusto Couto
Publikováno v:
Materials Research, Vol 21, Iss 5 (2018)
Metals solidification involves the transformation of the molten metal back into the solid state. Solidification structures impact heavily on the final product's characteristics. The microstructure effects on metallic alloys properties have been highl
Externí odkaz:
https://doaj.org/article/1e5a2b7dbc064244a5e0bdaaba9c7ee0
Publikováno v:
Tecnologia em Metalurgia, Materiais e Mineração, Vol 11, Iss 2, Pp 99-104 (2014)
This research work investigated some important mechanical properties of Inconel 718 superalloy using hot tensile tests like conventional yield strength to 0.2% strain (σe ), ultimate strength (σr ), and specific elongation (εu ). Samples were
Externí odkaz:
https://doaj.org/article/c7d9ef029b6f466fbee235936980d2d8
Publikováno v:
Metals, Vol 9, Iss 1, p 47 (2019)
The purpose of this work is to study the effect of heat treatments on the microstructure of the nickel-based superalloy Inconel 713C. Three different conditions were studied and the results compared: (1) as cast; (2) solid solution treatment (1179 °
Externí odkaz:
https://doaj.org/article/d5befaf33f6640fe80314b02298d3535
Autor:
Francisco José Correa Braga, Sizue Ota Rogero, Antônio Augusto Couto, Rodrigo Fernando Costa Marques, Alexandre Antunes Ribeiro, João Sinézio de Carvalho Campos
Publikováno v:
Materials Research, Vol 10, Iss 3, Pp 247-251 (2007)
Biomaterials (composites and blends) play a major role in the health of modern society. This paper reports on the preparation and characterization of polyvinylidene fluoride (PVDF) and hydroxyapatite (HAP) composites, analyzing the incorporation of H
Externí odkaz:
https://doaj.org/article/f35c30feb6e648318f1dc5604feab953
Autor:
Izabel Fernanda Machado, Maurício Silva Nascimento, Rogerio Teram, Givanildo Alves dos Santos, P.S.P. Monteiro, Vinicius Torres dos Santos, Antônio Augusto Couto, Francisco Yastami Nakamoto, Sérgio Duarte Brandi, Márcio Rodrigues da Silva
Publikováno v:
Defect and Diffusion Forum. 412:185-195
Friction welding (FRW) is an important commercial solid-state welding process in which coalescence is achieved by frictional heat combined with pressure. The objective of this work is to analyze the microstructure and the mechanical behavior of the c
Autor:
W.C. da Silva, J.R.C. Cunali, C.S. Hattori, R.L.P. Gonçalves, R. C. Souza, Gisele F. C. Almeida, R.G. Santos, Antônio Augusto Couto
Publikováno v:
Journal of Materials Research and Technology, Vol 14, Iss, Pp 2970-2981 (2021)
This work aimed to obtain by extrusion two aluminum alloys, 7108 and 7046. The microstructural characterized at each stage of the manufacturing process and the mechanical fatigue behavior of the extruded profile were evaluated. The aluminum alloys in
Autor:
C. Contatori, Jan Vatavuk, A.A.C. Borges, N.B. de Lima, N.I. Domingues, Gisele F. C. Almeida, Antônio Augusto Couto, R.L. Barreto
Publikováno v:
Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 15862-15873 (2020)
This paper aims to investigate the copper and the magnesium effects on the microstructure, on the hardness, and on the resistance to micro-abrasive wear of the alloy Al–19Si. Early findings could show that the hypereutectic Al–Si alloys fabricate
Autor:
Antônio Augusto Couto, Carlos Frajuca, Maurício Silva Nascimento, Márcio Rodrigues da Silva, Ricardo Aparecido da Cruz, Francisco Yastami Nakamoto, Vinicius Torres dos Santos, Gilmar Ferreira Batalha, Givanildo Alves dos Santos
Publikováno v:
Materials Science Forum. 1012:302-307
The Cu-8.5wt % Sn alloy presents an extensive microsegregation during its solidification. That microsegregation results in the formation of a eutectoid mixture, which is detrimental to subsequent forming processes. This study deals with the influence