The Influence of the Sintering Temperature on the Grain Growth of Tungsten Carbide in the Composite WC-8Ni

Miranda, Fabio; Rodrigues, Daniel; Nakamato, F.Y.; Frajuca, Carlos; Santos, Givanildo Alves dos

doi:10.4028/www.scientific.net/msf.899.424

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…Directional solidification allows different microstructures to be obtained in the length of the molten ingot, influencing the alloy properties. The effects of the manufacturing processes on the microstructure and properties of engineering materials have been highlighted in various studies [14,15,16,17,18,19,20]. Thermal parameters of solidification, as tip growth rate (V L ) and cooling rate (T R ), were correlated with hardness and microhardness values for both alloys studied.…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermal Variables of Solidification on the Microstructure, Hardness, and Microhardness of Cu-Al-Ni-Fe Alloys

et al. 2019

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Aluminum bronze is a complex group of copper-based alloys that may include up to 14% aluminum, but lower amounts of nickel and iron are also added, as they differently affect alloy characteristics such as strength, ductility, and corrosion resistance. The phase transformations of nickel aluminum–bronze alloys have been the subject of many studies due to the formations of intermetallics promoted by slow cooling. In the present investigation, quaternary systems of aluminum bronze alloys, specifically Cu–10wt%Al–5wt%Ni–5wt%Fe (hypoeutectoid bronze) and Cu–14wt%Al–5wt%Ni–5wi%Fe (hypereutectoid bronze), were directionally solidified upward under transient heat flow conditions. The experimental parameters measured included solidification thermal parameters such as the tip growth rate (VL) and cooling rate (TR), optical microscopy, scanning electron microscopy (SEM) analysis, hardness, and microhardness. We observed that the hardness and microhardness values vary according to the thermal parameters and solidification. We also observed that the Cu–14wt%Al–5wt%Ni–5wi%Fe alloy presented higher hardness values and a more refined structure than the Cu–10wt%Al–5wt%Ni–5wt%Fe alloy. SEM analysis proved the presence of specific intermetallics for each alloy.

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Section: Introductionmentioning

confidence: 99%

Effects of Thermal Variables of Solidification on the Microstructure, Hardness, and Microhardness of Cu-Al-Ni-Fe Alloys

et al. 2019

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“…The Cu-8.5wt% Sn alloy was prepared with commercially pure tin and UNS C50700 bronze. The material was melted in an electric furnace under an argon gas atmosphere (1). The solidification of the molten material took place in a bipartite mold, which was inside an upwardly unidirectional solidifying device.…”

Section: Methodsmentioning

confidence: 99%

“…The Cu-8.5wt% Sn alloy has a chemical composition similar to that of the UNS C51200 phosphor bronze, a material commonly used in the manufacture of springs, bearings, and electrical contacts. The effects of manufacturing processes on microstructure of engineering materials have been highlighted in various studies [1][2][3][4][5][6][7]. During the solidification of this bronze, the microsegregation of tin enables the formation of a eutectoid mixture, which is hard, brittle and detrimental to the subsequent forming process, since this mixture facilitates the propagation of cracks [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Mathematical Modeling for Determination of Volume Fraction of Eutectoid Mixture of the Cu-8.5wt% Sn Alloy Obtained by Unidirectional Upward Solidification

Cruz

Santos

Nascimento

et al. 2020

MSF

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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 of solidification time and cooling rate on the microstructure of that alloy. The unidirectional solidification technique allowed the acquisition of thermal data. The optical microscopy enabled the microstructural characterization of the material, the measurement of dendrite arm spacings and the quantification of the volume fraction of the eutectoid mixture. A semi-analytical mathematical model was proposed to estimate the volume fraction of the eutectoid mixture. The model expresses the volume fraction as an implicit function of the Fourier number. The results showed that the microstructure is dendritic and that the characteristic spacings increase with the solidification time between the liquidus and the peritectic temperatures. The data also showed that for higher cooling rates the dendrite arm spacings are smaller and that there is a tendency for the volume fraction of eutectoid mixture in the columnar zone to increase with the Fourier number and to decrease with the cooling rate. The proposed model allowed obtaining values of volume fraction with the same order of magnitude of the experimental data, but with behavior tendency opposite to that observed.

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“…Studies on the relationship between microstructure size and corrosion resistance are important for the development of new alloys. The effects of manufacturing processes on microstructure and properties of engineering materials have been highlighted in various studies [1][2][3][4][5][6][7]. The directional solidification technique allows that, when subjecting a certain type of alloy to a solidification process in which each solidified region presents different cooling rates, that different sizes of microstructure are obtained.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Thermal Parameters on the Microstructure, Corrosion Resistance and Hardness on the Unidirectional Solidification of Al-10wt% Si-5wt% Cu Alloy

Santos

Ribeiro²,

Nascimento

et al. 2020

MSF

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This study aims to correlate thermal parameters in the directional solidification of Al-10wt% Si-5wt% Cu alloy with the resulting microstructure and, in addition, with hardness and corrosion resistance. The results include primary dendritic arm spacing (PDAS), tip growth rate (VL), cooling rate (TR), scanning electron micrographs (SEM), hardness values and corrosion resistance parameters obtained by electrochemical impedance spectroscopy (EIS) and by the Tafel extrapolation method, conducted in 3% (m/v) NaCl solution at room temperature. The results show that coarser PDAS exhibit a tendency to increase in corrosion resistance, except in the positions with higher concentrations of the intermetallic compound Al2Cu, that surrounded by an aluminum rich phase tends to have a higher resistance to corrosion. The hardness values remained constant.

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The Influence of the Sintering Temperature on the Grain Growth of Tungsten Carbide in the Composite WC-8Ni

Cited by 5 publications

References 5 publications

Effects of Thermal Variables of Solidification on the Microstructure, Hardness, and Microhardness of Cu-Al-Ni-Fe Alloys

Effects of Thermal Variables of Solidification on the Microstructure, Hardness, and Microhardness of Cu-Al-Ni-Fe Alloys

Microstructural Characterization and Mathematical Modeling for Determination of Volume Fraction of Eutectoid Mixture of the Cu-8.5wt% Sn Alloy Obtained by Unidirectional Upward Solidification

Influence of the Thermal Parameters on the Microstructure, Corrosion Resistance and Hardness on the Unidirectional Solidification of Al-10wt% Si-5wt% Cu Alloy

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