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R. Sellamuthu - One of the best experts on this subject based on the ideXlab platform.
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Determination on the Effect of Tin Content on Microstructure, Hardness, Optimum Aging Temperature and Aging Time for Spinodal Bronze Alloys Cast in Metal Mold
International Journal of Metalcasting, 2017Co-Authors: Karthik V. Shankar, R. SellamuthuAbstract:A study was conducted to determine the effect of tin content on microstructure, hardness, optimum Aging Temperature and Aging time of spinodal bronze alloys cast in metal mold. Copper, nickel and tin with appropriate compositions were melted in an electric furnace under argon atmosphere and were cast into metal molds. The cast specimens were solutionized at 825 °C for 10 h and were aged at 250, 300, 350, 400 and 450 °C for 1–5 h. The solutionized and aged specimens were subjected for microstructural evaluation and hardness testing. It was observed that the grain boundary precipitates form upon over-Aging. The peak hardness increases with increase in tin content from 4 to 12 wt% in solutionized and aged condition. The peak Aging time was found to remain a constant with increase in Sn content. The optimum Aging Temperature and Aging time were also determined for spinodal bronze alloys cast in metal mold.
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Determination of optimum Aging Temperature and time, mechanical and wear properties for Cu-9Ni-6Sn spinodal bronze alloy cast using permanent mould
International Journal of Materials Engineering Innovation, 2017Co-Authors: Karthik V. Shankar, R. SellamuthuAbstract:A detailed study was performed to find the optimum Aging Temperature and time for Cu-9Ni-6Sn spinodal alloy cast using permanent mould. The mechanical and wear properties of the alloy were determined and their variations with the Aging Temperature and time was researched for solutionised and aged condition. The as-cast dendritic structure was completely removed from the alloy after the heat treatment process. The top hardness was found to increase and then decreased with the Aging Temperatures and time. The optimum Aging time and Temperature for the Cu-9Ni-6Sn spinodal alloy were also determined. The tensile properties were found to be high when compared with that of the Cu-6Sn. The wear rate values exhibit a decrease with an increase in the hardness of the spinodal alloy. Characterisation of the spinodal alloy was conducted to discuss the wear mechanism and the fracture mode of the spinodal alloy.
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determination of the effect of nickel content on hardness optimum Aging Temperature and Aging time for spinodal bronze alloys cast in metal mould
Applied Mechanics and Materials, 2015Co-Authors: Karthik V. Shankar, R. SellamuthuAbstract:An investigation was conducted to find the optimum Aging Temperature and Aging time for Cu-Sn-Ni spinodal bronze alloys with varying nickel wt% cast in metal mould. The specimens were subjected to solutionisation and were aged at 250°C, 300°C, 350°C, 400°C and 450°C to induce spinodal decomposition. The microstructural observation reveals that the dendritic structure of the as-cast alloy was completely eliminated after solutionisation and grain boundary precipitates were formed with increase in Aging time. The peak hardness and the peak Aging time increases with increase in nickel content. This implies that nickel contributes to spinodal decomposition process.
Dheerendra Kumar Dwivedi - One of the best experts on this subject based on the ideXlab platform.
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Aging Temperature and abrasive wear behaviour of cast Al–(4%, 12%, 20%)Si–0.3% Mg alloys
Materials & Design, 2007Co-Authors: Kamal Shah, Sandeep Kumar, Dheerendra Kumar DwivediAbstract:Abstract In the present paper, influence of Aging Temperature during artificial age hardening treatment (T6) of cast Al–(4, 12, 20%)Si–0.3% Mg on abrasive wear behaviour has been reported. Alloys were prepared by controlled melting and casting. Cast alloys were given age hardening treatment having sequence of solutionizing, quenching and artificial Aging. All the alloys were solutionized at 510 °C for 8 h followed by water quenching (30 °C) and Aging hardening at 150, 170, 190, 210 and 230 °C for 12 h. Abrasive wear tests were conducted against of 320 grade SiC abrasive medium at 5 and 10 N normal loads. It was observed that the silicon content and Aging Temperature significantly affect the wear resistance. Increase in Aging Temperature improves the wear resistance. Hypereutectic alloy showed better wear resistance than the eutectic alloy under identical conditions. Optical microstructure study of alloys under investigation has shown that cast dendritic structure is destroyed besides the spheroidization of eutectic silicon crystals after the heat treatment. The extent of change in structure depends on Aging Temperature. Scanning electron microscopy (SEM) of wear surface was carried to analyze the wear mechanism.
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Aging Temperature and abrasive wear behaviour of cast al 4 12 20 si 0 3 mg alloys
Materials & Design, 2007Co-Authors: Kamal Shah, Sandeep Kumar, Dheerendra Kumar DwivediAbstract:Abstract In the present paper, influence of Aging Temperature during artificial age hardening treatment (T6) of cast Al–(4, 12, 20%)Si–0.3% Mg on abrasive wear behaviour has been reported. Alloys were prepared by controlled melting and casting. Cast alloys were given age hardening treatment having sequence of solutionizing, quenching and artificial Aging. All the alloys were solutionized at 510 °C for 8 h followed by water quenching (30 °C) and Aging hardening at 150, 170, 190, 210 and 230 °C for 12 h. Abrasive wear tests were conducted against of 320 grade SiC abrasive medium at 5 and 10 N normal loads. It was observed that the silicon content and Aging Temperature significantly affect the wear resistance. Increase in Aging Temperature improves the wear resistance. Hypereutectic alloy showed better wear resistance than the eutectic alloy under identical conditions. Optical microstructure study of alloys under investigation has shown that cast dendritic structure is destroyed besides the spheroidization of eutectic silicon crystals after the heat treatment. The extent of change in structure depends on Aging Temperature. Scanning electron microscopy (SEM) of wear surface was carried to analyze the wear mechanism.
Karthik V. Shankar - One of the best experts on this subject based on the ideXlab platform.
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Determination on the Effect of Tin Content on Microstructure, Hardness, Optimum Aging Temperature and Aging Time for Spinodal Bronze Alloys Cast in Metal Mold
International Journal of Metalcasting, 2017Co-Authors: Karthik V. Shankar, R. SellamuthuAbstract:A study was conducted to determine the effect of tin content on microstructure, hardness, optimum Aging Temperature and Aging time of spinodal bronze alloys cast in metal mold. Copper, nickel and tin with appropriate compositions were melted in an electric furnace under argon atmosphere and were cast into metal molds. The cast specimens were solutionized at 825 °C for 10 h and were aged at 250, 300, 350, 400 and 450 °C for 1–5 h. The solutionized and aged specimens were subjected for microstructural evaluation and hardness testing. It was observed that the grain boundary precipitates form upon over-Aging. The peak hardness increases with increase in tin content from 4 to 12 wt% in solutionized and aged condition. The peak Aging time was found to remain a constant with increase in Sn content. The optimum Aging Temperature and Aging time were also determined for spinodal bronze alloys cast in metal mold.
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Determination of optimum Aging Temperature and time, mechanical and wear properties for Cu-9Ni-6Sn spinodal bronze alloy cast using permanent mould
International Journal of Materials Engineering Innovation, 2017Co-Authors: Karthik V. Shankar, R. SellamuthuAbstract:A detailed study was performed to find the optimum Aging Temperature and time for Cu-9Ni-6Sn spinodal alloy cast using permanent mould. The mechanical and wear properties of the alloy were determined and their variations with the Aging Temperature and time was researched for solutionised and aged condition. The as-cast dendritic structure was completely removed from the alloy after the heat treatment process. The top hardness was found to increase and then decreased with the Aging Temperatures and time. The optimum Aging time and Temperature for the Cu-9Ni-6Sn spinodal alloy were also determined. The tensile properties were found to be high when compared with that of the Cu-6Sn. The wear rate values exhibit a decrease with an increase in the hardness of the spinodal alloy. Characterisation of the spinodal alloy was conducted to discuss the wear mechanism and the fracture mode of the spinodal alloy.
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determination of the effect of nickel content on hardness optimum Aging Temperature and Aging time for spinodal bronze alloys cast in metal mould
Applied Mechanics and Materials, 2015Co-Authors: Karthik V. Shankar, R. SellamuthuAbstract:An investigation was conducted to find the optimum Aging Temperature and Aging time for Cu-Sn-Ni spinodal bronze alloys with varying nickel wt% cast in metal mould. The specimens were subjected to solutionisation and were aged at 250°C, 300°C, 350°C, 400°C and 450°C to induce spinodal decomposition. The microstructural observation reveals that the dendritic structure of the as-cast alloy was completely eliminated after solutionisation and grain boundary precipitates were formed with increase in Aging time. The peak hardness and the peak Aging time increases with increase in nickel content. This implies that nickel contributes to spinodal decomposition process.
P. Berthod - One of the best experts on this subject based on the ideXlab platform.
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Room Temperature hardness of carbides strengthened cast alloys in relation with their carbon content and Aging Temperature. Part 3 -Case of iron alloys
Materials Science and Technology, 2009Co-Authors: P. BerthodAbstract:Vickers macro–indentation was performed on seven cast and aged {Fe, 30wt.%Cr}–based alloys with carbon contents varying from 0 to 2.0 wt.%. The measured hardness was studied versus the carbon content and the Aging Temperature (1000, 1100 and 1200°C). The hardness increases with the carbon content, firstly slowly but much faster when the carbides fraction reaches 30 vol.%. A hardness of 600 Hv or more can then be achieved. For low carbon contents, the hardness increases slower than a law of mixture of the volume fractions and of the hardness of carbides and matrix. This is due to the great difference of hardness between the two phases responsible, which leads to the deformation of the matrix only. Beyond the critical value of 30 vol.% of carbides, i.e. when the carbon content approaches 2 wt.%C, hardness drastically increases since the main role in resistance against indentation is then played by the hard carbides skeleton which has become continuous enough.
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Room Temperature hardness of carbides-strengthened cast alloys in relation with their carbon content and the Aging Temperature. Part I: Case of nickel alloys
Materials Science and Technology, 2009Co-Authors: P. BerthodAbstract:The addition of hard particles in a ductile alloy may lead to a substantial increase in its hardness and in the difficulty to machine it. This work aims to specify the role of chromium carbides in the hardness of cast nickel alloys. A Ni-30 wt.%Cr alloy and six {0 to 2 wt.%C}-containing alloys based on the first one, were elaborated by foundry. Their microstructures after Aging at 1,000, 1,100 and 1,200°C were described, and the room Temperature Vickers hardness of all alloys for the three Aging treatments was measured. Hardness increases with carbon content following a curve which is almost parabolic, while it increases more linearly versus the volume fraction of carbides. Hardness is generally lowered by choosing higher Aging Temperature. The evolution of hardness was compared with a law of mixture based on the hardness and the volume fractions of the matrix and of the carbides.
Zhiling Tia - One of the best experts on this subject based on the ideXlab platform.
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influence of Aging Temperature on strength and toughness of laser welded t 250 marAging steel joint
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016Co-Authors: Jiguo Sha, Chunxu Wang, Zhiling TiaAbstract:Abstract This paper presents an investigation on the strength and toughness of laser-welded T-250 marAging steel joint, aimed at elucidating the influence mechanism of Aging Temperature on microstructures and mechanical properties of the joints. The results showed that as the Aging Temperature increased, the ultimate tensile strength of welded joints increased, reaching a maximum of 1640.5 MPa at 520 °C, and then decreased. The static toughness of welded joints decreased at first and increased later with the Aging Temperature increasing. The minimum of 38.8 MJ m −3 for the static toughness was obtained at 560 °C. There were two types of reverted austenite respectively distributing in grain boundaries and in the matrix of martensite, due to the change of Aging Temperatures. This study underscores that the Ni 3 (Ti, Mo) precipitate and reverted austenite are the critical factors influencing the strength and toughness of welded joints. The Ni 3 (Ti, Mo) precipitate in the weld metal improves the strength of welded joints remarkably as its volume fraction increases. The reverted austenite in grain boundaries is harmful to the toughness of welded joints, while the reverted austenite in the matrix is beneficial to the toughness of welded joints because of its finely dispersive distribution and its ability to prevent crack propagation. Increasing the amount of reverted austenite in the matrix is an effective way to improve mechanical properties of laser-welded marAging steel joints.
