Ramkumar Thulasiram

@mcet.in

ASSISTANT PROFESSOR (SG)
Dr. Mahalingam College of Engineering and Technology



           

https://researchid.co/ramkimech89

RESEARCH INTERESTS

Powder Metallurgy, Nano Composites

77

Scopus Publications

Scopus Publications

  • Microstructural evaluation and optimization of wear behaviour of vacuum arc melted AlFeCrNiSi high entropy alloy
    N. Radhika, M.V. Kamal, V. Ram Srivatsav, M. Sathishkumar, and T. Ramkumar
    Elsevier BV

  • Corrosion Behavior of Microwave-Sintered Ti6Al6V2Sn Reinforced with Graphene Nanoparticles
    U. V. Akhil, N. Radhika, and T. Ramkumar
    Springer Science and Business Media LLC

  • Experimental and Numerical Fatigue Life Assessment of Ti–5Al–2.5Sn Reinforced Tungsten Particle Composites
    M. Giridharadhayalan, T. Ramkumar, M. Selvakumar, and S. Parveen
    Springer Science and Business Media LLC

  • Printing High-Strength High-Elongation Al4043 Alloy Using UNS A94043 Welding Wires through Wire Arc Additive Manufacturing
    T. Ramkumar, D. Nathan, M. Selvakumar, V. Vigneshkumar, and P. Narayanasamy
    Springer Science and Business Media LLC

  • Cenosphere filled epoxy composites: structural, mechanical, and dynamic mechanical studies
    K. Pratheesh, P. Narayanasamy, R. Prithivirajan, T. Ramkumar, P. Balasundar, S. Indran, M.R. Sanjay, and Suchart Siengchin
    Springer Science and Business Media LLC

  • Evaluation on properties of composite materials containing Caryota fiber (CF) for wall roof applications
    T. Ramkumar, Jayaraj Mahalingam, and M. Selvakumar
    Springer Science and Business Media LLC

  • Tribo-mechanical performance of Al-nano TiC composites processed by microwave-assisted powder metallurgy
    P. Balasundar, S. Senthil, P. Narayanasamy, Peerawatt Nunthavarawong, Abhilashsharan Tambak, T. Ramkumar, and B.K. Parrthipan
    Elsevier BV

  • EXPERIMENTAL INVESTIGATION ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF DSS2205 AND SS304L DISSIMILAR WELDMENTS
    M. MURUGAN, G. SELVAKUMAR, T. RAMKUMAR, and M. SELVAKUMAR
    World Scientific Pub Co Pte Ltd
    This paper outlines the TIG welding process without using active flux for 4[Formula: see text]mm-thick plates of duplex stainless steel (DSS 2205) and austenitic stainless steel (SS 304L). It also provides the properties and behavior analysis of weldments. Complete penetration is achieved with multi-pass welding. The microstructure is examined using an optical microscope (OM) and a scanning electron microscope (SEM). It was used to report on the differences between the unpolished zone and the heat-affected zone (HAZ) in weldments. A Vickers hardness tester (HV scale 10) was used to assess the weldment’s hardness. Tensile and bend failure were among the mechanical properties exhibited by the parent metals of DSS2205, SS304L, and dissimilar junctions. The findings demonstrated shallow gaps in the surface area and a greater ultimate tensile strength of 600[Formula: see text]MPa for DSS similar welding. However, compared to other similar weldments, dissimilar weldments exhibit superior performance in bending conditions.


  • Microstructure, High-Temperature Wear, and Corrosion Behaviors of UNS R56320-xWC Composite Fabricated through Powder Metallurgy
    P. Muthusamy, M. Mohanraj, T. Ramkumar, and M. Selvakumar
    Springer Science and Business Media LLC

  • Experimental Investigation of Corten Steel Using Cold Metal Transfer Welding
    Sreejith S. Nair, I. Rajendran, and T. Ramkumar
    Springer Science and Business Media LLC

  • Wear and corrosion resistance of Al<inf>2</inf>O<inf>3</inf> and TiC deposition on steel substrate using self- propagating high temperature synthesis method
    U V Akhil, N Radhika, N Jeyaprakash, and T Ramkumar
    IOP Publishing
    Abstract In the present work, a low-carbon steel substrate was coated with Al2O3 and TiC using self-propagating high temperature synthesis. The synthesized coatings were annealed at 450 °C for 2–6 h. The characteristics of the substrate, coated, and annealed samples were examined, including microhardness, wear resistance, and corrosion resistance. A pin-on-disc tribometer was employed to conduct the wear test by varying the load, sliding velocity, and distance. The impact of these factors on the wear rate and worn surface morphology was then examined. Further, corrosion resistance was evaluated using electrochemical corrosion testing with 3.5 wt% NaCl as electrolyte. Results showed that Al2O3 and TiC specimens annealed at 450 °C for 5 h and 4 h improved the microhardness by 1.3 and 1.06 times than that of as-coated specimens respectively. The synthesized Al2O3 and TiC coatings showed an abrasive wear mechanism at higher loads and tribolayer formation was observed at higher sliding velocity and distances. The corrosion and wear resistances of the samples were found as follows: substrate&lt; Al2O3 coated &lt; TiC coated &lt; Al2O3 annealed &lt; TiC annealed. The Al2O3 and TiC ceramic coatings were found to improve wear and corrosion resistance having potential applications in cement, petrochemical, and marine industries.




  • Prediction of Tribological Performance of Ti-3Al-2.5 V-xWC Composite using Machine Learning Models
    T. Ramkumar, V. K. Sudha, M. Selvakumar, and P. Muthusamy
    Springer Science and Business Media LLC

  • Investigation on the mechanical and tribological behavior of tungsten-reinforced Ti-5Al-2.5Sn composites
    M. Giridharadhayalan, T. Ramkumar, and M. Selvakumar
    SAGE Publications
    The composite material under this investigation was fabricated using the microwave sintering process. The matrix materials chosen for the preparation of composite materials include pure titanium (Ti), aluminium (Al), and tin (Sn). Tungsten (W) is used as the reinforcing material, with variable weight percentages of 0.5%, 1%, 1.5%, 2%, and 2.5%. The purpose of this study is to assess the fundamental mechanical properties (microhardness, elastic moduli, fracture toughness, contact stiffness, etc.) and surface degradation properties (wear) of the composite materials that were fabricated. Furthermore, energy-dispersive X-ray spectroscopy with line mapping analysis were performed to verify the existence of reinforcement particles evenly distributed in the matrix material and scanning electron microscope (FE-SEM) examination was done on the wear tested samples. The density of the Ti-5Al-2.5Sn-2W composite material has been enhanced in comparison to the density of Ti-5Al-2.5Sn. The results of the Micro Vickers hardness test indicate that the Ti-5Al-2.5Sn-2W composite exhibits a hardness that is 3.1% higher than that of the Ti-5Al-2.5Sn material. In comparison to Ti-5Al-2.5Sn, the Ti-5Al-2.5Sn-2W composite displayed a 10% lower wear rate and 7% coefficient of friction, respectively. The findings show that increasing the weight percentage of tungsten (W) greatly enhances the mechanical and wear characteristics of the composites.

  • DRY and HOT CORROSION BEHAVIOUR of Al-Ni-Co-x MWCNT COMPOSITES PROCESSED THROUGH POWDER METALLURGY
    M. PADMANABAN, RAMA THIRUMURUGAN, and T. RAMKUMAR
    World Scientific Pub Co Pte Ltd
    The outcome of this research paper is to investigate the room and hot corrosion behavior of Al-10Ni-4Co-x multi-walled carbon nanotube (MWCNT) composites processed through Powder Metallurgy (P/M). The secondary particle MWCNT content was varied as 0.5, 1.0 and 1.5[Formula: see text]wt.%, respectively. The fabricated composites were characterized using a Scanning Electron Microscope (SEM). The corrosion behavior of the composites was analyzed using Tafel polarization. After polarization, the corroded surfaces were analyzed using SEM. The high temperature corrosion behavior was also investigated and found that the corrosion rate of 3.9025 mpy for 90Al-10Ni-4Co composite and 4.9025 mpy for 85Al-10Ni-4Co-1.0MWCNT composite. The results indicated that 84.5Al-10Ni-4Co-1.5MWCNT composite possessed better corrosion resistance than other composites. Various elements including Na, Cl, Al, Ni, Co, Mg, Si and O were observed. It reveals that Na[Formula: see text] and Cl− ions react well with Ti. Hot corrosion studies clearly demonstrated that after the 50 h test, the samples with MWCNT inclusion exhibited improved corrosion resistance. The 85Al-10Ni-4Co-1.0MWCNT composite showed a mass change of 0.01870[Formula: see text]mg which was 5% lower than 90Al-10Ni-4Co composite.

  • Studies on characteristics of natural cellulosic fibers collected from the agro-discarded Solanum trilobatum stem waste
    N. Gnanasekar, M. Jayaraj, Rama Thirumurugan, and T. Ramkumar
    Springer Science and Business Media LLC

  • Crack-free hard facing options for orifice plate used in oil refinery applications
    Chandramohan Palanisamy, Tamizhinian Vasanthan, Selvakumar Mani, and Ramkumar Thulasiram
    SAGE Publications
    The purpose of this study is to select a suitable tubular wire electrode as an alternative hardfacing material for Stellite 1 in the production of SS304 orifice plates used in oil refineries. It is also intended to develop an efficient deposition procedure for crack-free hardfacing. Compatible cobalt, nickel, and iron-based hardfacing alloys were selected so as to match the hardness and hot hardness properties of stellite 1. Moving heat source analysis was performed to find the heat affected zones and the thermal stress distribution during hardfacing. The significance of weld speed, bead width, and weld concentration on the weld deposition process was analysed using ANSYS, to extract an efficient deposition procedure. The hardfacing alloys were tested for stress and deformation at working temperature (up to 815 οC) to understand the performance. Seven materials were taken into consideration as options along with six parameters. The results revealed a higher longitudinal residual stress of 2000 MPa for Talonite and Tribaloy hardfacing alloys. Colmonoy 6 was found to be having the least stress value of 2186 MPa. Furthermore, the von mises stress values arrived for different conditions showed that the optimal welding condition is 5 mm/s welding speed, 3 mm radius of beam and 455 °C preheat temperature. Microstructural study revealed the dendrite growth in the surface of Colomony 6 hardfacing during solidification, which led to the improvement in mechanical properties.

  • Thermal and mechanical characterisation of friction stir welded dissimilar aluminium alloys
    T Kasirajan, M Selva Kumar, T Ramkumar, and M Mohanraj
    SAGE Publications
    The influence of thermal properties on the friction stir welded (FSW) dissimilar aluminium alloys at different tool rotational speeds and tool pin profiles was studied. AA 5083 H111 and AA 6082 T6 of 6 mm aluminium alloy plates are welded by varying the process parameters. The influence of heat generation and heat transfer in the joint efficiency of the weldments are characterised. Heat flow and heat flux for various tool rotation speeds generated between the tool shoulder and workpiece are calculated and analysed. The rate of heat distribution during welding is evaluated by calculating the thermal diffusivity of AA5083 H111 and AA6082 T6. Microhardness test helps to comprehend the influence of the parameters over the mechanical property of the weldments. The results revealed that the thermal characterisation clearly illustrates that an increase in tool rotation speed directly amplifies the heat flow and heat flux in weldments. However, AA 5083 H111 and AA 6082 T6 for varying temperature and reveals that 580°C possessed higher thermal conductivity for AA 6082 T6 (260 W/m°C) and AA 5083 5083 H111 (160 W/m°C), thermal conductivity for AA 6082 T6 (1260 J/Kg°C) and AA 50835083 H111 (1225 J/Kg°C) and thermal Diffusivity was 5.2029 × 10−5 (m2/s) for AA 5083 H111 and 7.61819 × 10−5 (m2/s) for AA 6082 T6.

  • Investigation of mechanical and tribological behavior of Al-Ni-Co-MWCNT composites prepared by powder metallurgy technique
    Rama Thirumurugan, M Padmanaban, T Ramkumar, and D Shanmugam
    SAGE Publications
    The intended research is to improve the mechanical and tribological properties of Al-Ni-Co alloy by reinforcing the alloy with multiwall carbon nanotubes (MWCNT) using powder metallurgy. In this work MWCNT content varied from 0.5, 1.0, and 1.5 as wt. % and mixed with the Al-Ni-Co matrix. The composites are fabricated by cold compaction and conventional sintering technique. The presence of homogenous distribution was analyzed by using scanning electron microscope (SEM) with energy dispersive spectroscopy. The hardness of the composites was also explored by using Vickers' indentation and found that porosity plays a vital role and it directly influences the hardness and the mechanical properties. The wear behavior of the composites was measured using the Pin-on-Disc method at room temperature. The results revealed that 84.5Al-10Ni-4Co-1.5MWCNT possessed less volume loss (0.458 mm3) and coefficient of friction (0.45) compared to other samples. After wear analysis, the surface morphology was analyzed using SEM. The outcome of the research is MWCNT plays a vital role to improve the mechanical and tribological properties of Al-Ni-Co composites.



  • Mechanical, thermal, electrical, and corrosion properties of microwave-sintered Ti-0.8Ni-0.3Mo/TiB composites
    P Balasundar, S Senthil, P Narayanasamy, and T Ramkumar
    IOP Publishing
    Abstract In this study, Titanium boride (TiB) reinforced Ti-0.8Ni-0.3Mo/XTiB (X = 5, 10, 15, and 20 wt%) composites were successfully fabricated by microwave sintering assisted powder metallurgy process. Scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS) and x-ray diffraction (XRD) analyses were used to evaluate the elemental powders individually. The distribution of TiB particles in the sintered Ti-0.8Ni-0.3Mo composites was observed using optical microscopy (OM) and SEM. The Microhardness of the microwave-sintered samples was evaluated through Micro Vicker’s hardness testing machine. Thermal characteristics were estimated for temperatures ranging from 50 to 250 °C. The electrical conductivity of Ti-0.8Ni-0.3Mo/TiB composites was calculated from the measured resistance values using the four-point probe method at room temperature. The immersion method was performed to estimate the corrosion properties by suspending the sintered samples in 3.5% NaCl solution for 60 h. The morphology of the corroded surfaces was examined using SEM. The results revealed that Ti-0.8Ni-0.3Mo/15TiB possessed optimum hardness values from 220 to 260 HV, mechanical properties such as True yield strength from 728 to 814 MPa, ultimate compression strength from 1335 to 1680 MPa, fracture strain of 6.12 to 13.81%. It also revealed less weight loss in a corrosion medium of 0.6 g. The Ti-0.8Ni-0.3Mo/TiB composites had good properties in densification aspects, which is suitable for applications such as marine and airfare components.