Precipitation Hardening
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Analysis of β´(Cu4Ti) Precipitation During Isothermal Aging of a Cu-4wt.%Ti Alloy
This work analyzed experimental and numerically the growth kinetics of β´precipitation of a Cu-4wt.%Ti alloy after aging at 400, 500 and 600 ºC for times from 0.0166 h to 200 h. Results indicated that the precipitation process is almost controlled by nucleation and growth during aging at 400 ºC, originating a slow growth kinetics of precipitation. In con
Mat. Res.. Publicado em: 09/08/2018
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2. Fracture Behavior and Fatigue Performance of Inconel 625
Inconel 625 is a nickel-based highly-resistant superalloy widely used in aerospace components, in the nuclear industry, and especially in the maritime industry. Materials such as Inconel 625 have been widely used in oil exploration of Brazilian pre-salt layers due to their excellent resistance to corrosion under tension, pitting and crevice corrosion by chlo
Mat. Res.. Publicado em: 25/06/2018
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3. Mechanical and Metallurgical Characterization of Laser Welding on P91 Ferritic Steel and Incoloy 800HT Dissimilar Joints
In this work, microstructural characterization and mechanical properties of P91 and Incoloy 800HT dissimilar laser beam welded joint were analyzed. In addition to that, metallographical studies were conducted using Optical microscopy, Scanning electron microscopy (SEM) equipped with Energy-dispersive X-ray spectroscopy (EDX) and X-Ray diffraction analysis (
Mat. Res.. Publicado em: 01/02/2018
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4. Effect of the T6 Heat Treatment on Microhardness of a Directionally Solidified Aluminum-Based 319 Alloy
Aluminum alloys of the ANSI series 319 present Si and Cu as the main alloying elements and the mechanical strength of these alloys can be improved by the precipitation of the metastable Al2Cu phase during the ageing heat treatment. In this paper, the Al-5.5wt.%Si-3wt.%Cu alloy was elaborated and solidified in a water-cooled horizontal directional solidificat
Mat. Res.. Publicado em: 30/11/2017
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5. Effect of Quenching Rate and Pre-strain on the Strain Ageing Behaviors of 7075 Aluminum Alloys
The mechanical properties of aluminum alloys are strongly dependent on the thermo-mechanical process so, the strain ageing behavior of 7075 Al-alloy was investigated in this study. A set of test pieces was solution heat treated at 480 °C for 2 h, water quenched (SHTWQ) then pre-strained for 8% in tension. The test samples were aged at 140 °C for 0.5, 1, 2,
Mat. Res.. Publicado em: 2015-04
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6. Augmentation of wear-protective coatings for non-ferrous alloys by the addition of Cr and Ni elements
A number of Al-, Mg- and Ti-base alloys were preconditioned by oxidation via Plasma-electrolytic oxidation (PEO) followed by the addition of Cr and Ni elements in the coating pores by chemical precipitation and a final stage of mechanical treatment. The overall effect was a combination of hardness and resistance to wear. PEO voltage level was found to be a f
Mat. Res.. Publicado em: 2014-12
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7. The Role of cobalt and nickel intermetallic phases on the mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys
In this study, the effects of cobalt and nickel additions on microstructure evolution and mechanical properties of Al-Zn-Mg-Cu alloys produced by chill casting process were investigated. Al-Zn-Mg-Cu aluminum alloys containing Ni and Co additives were homogenized at different heat treatment conditions, aged at 120ºC for 24 h, and retrogressed at 180ºC for 3
Mat. Res.. Publicado em: 2014-12
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8. Evaluation of a 7050-TAF aluminum alloy submitted to creep age forming
CAF process combines creep and precipitation hardening which are highly dependent on time and temperature. The aging cycle relax the stresses induced during the loading phase. At the end of the process stress relaxation induces shape changes in the part but significant spring back is observed (about 70%). Usually CAF cycles for 7XXX alloys use times around 2
Mat. Res.. Publicado em: 29/04/2014
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9. Influência da adição de nanopartículas de TiO2 na obtenção de compósitos a base de liga AA2014 fabricada via metalurgia do pó / Influence of the addition of TiO2 nanoparticles in the composites formation based AA2014 alloy manufactured by powder metallurgy
Aluminum matrix composites and its alloys, especially AA2014, are widely used in automotive and aeronautics applications. The properties of this are very influenced by hardening treatment, however its use is limited at temperatures above 150C due to loss of properties caused by the growth of precipitates at this temperature. The addition of a new phase, fine
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2012
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10. Estudo de aço microligado ao vanádio para a produção de barra nervurada para concreto armado com característica de soldabilidade segundo norma ABNT NBR 8965:1985
This paper presents a vanadium microalloyed steel for the production of reinforced bars (rebars) that meets the chemical composition limits established by Brazilian standards to be considered weldable. Steel is produced via electric furnace, giving rise to billets. It is hot rolled in a rolling mill and cooled in air to obtain the rebar that meets the mechan
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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11. Cinética de envelhecimento de aços dual phase de baixa resistência mecânica laminados a frio
The kinetics of static strain aging in cold rolled Dual Phase steels of the 250/450 MPa grade of mechanical strength was studied by means of tensile tests. Two Dual Phase steels, with and without a chromium addition of 0.36wt%, were studied in a pilot scale. After the continuous annealing step, carried out in a Gleeble machine model 3500, the specimens were
Publicado em: 2009
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12. Influência dos tratamentos térmicos e tratamentos criogênicos na tenacidade do aço rápido AISI M2. / Influence of the heat treatments and cryogenic treatments on the toughness of the AISI M2 high speed steel.
In this work the toughness of the AISI M2 high speed steel heat treated by conventional and cryogenic routes has been evaluated. The toughness was evaluated through un-notched impact samples and 3 points bending cylindrical samples. The heat treatments were carried out in a vacuum furnace using nitrogen quenching with 6 bar of pressure. The conventional rout
Publicado em: 2008