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R. Sellamuthu – One of the best experts on this subject based on the ideXlab platform.

  • 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, 2017
    Co-Authors: Karthik V. Shankar, R. Sellamuthu

    Abstract:

    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, 2017
    Co-Authors: Karthik V. Shankar, R. Sellamuthu

    Abstract:

    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, 2015
    Co-Authors: Karthik V. Shankar, R. Sellamuthu

    Abstract:

    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.

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Dheerendra Kumar Dwivedi – One of the best experts on this subject based on the ideXlab platform.

  • Aging Temperature and abrasive wear behaviour of cast Al–(4%, 12%, 20%)Si–0.3% Mg alloys
    Materials & Design, 2007
    Co-Authors: Kamal Shah, Sandeep Kumar, Dheerendra Kumar Dwivedi

    Abstract:

    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, 2007
    Co-Authors: Kamal Shah, Sandeep Kumar, Dheerendra Kumar Dwivedi

    Abstract:

    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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Karthik V. Shankar – One of the best experts on this subject based on the ideXlab platform.

  • 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, 2017
    Co-Authors: Karthik V. Shankar, R. Sellamuthu

    Abstract:

    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, 2017
    Co-Authors: Karthik V. Shankar, R. Sellamuthu

    Abstract:

    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, 2015
    Co-Authors: Karthik V. Shankar, R. Sellamuthu

    Abstract:

    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.

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