NAGARAJ M
@iiitdm.ac.in
Assistant Professor, Department of Mechanical Engineering
Assistant Professor
EDUCATION
PhD -metal forming and Solid-state welding- 2019 -National Institute of Technology - Trichy.
M.E -Production Engineering- 2013 -Department of Mechanical Engineering-Thiagarajar College of Engineering Madurai.
RESEARCH, TEACHING, or OTHER INTERESTS
Mechanical Engineering, Industrial and Manufacturing Engineering, Metals and Alloys
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
M. Nagaraj and Suresh Neelakantan
Elsevier BV
M. Nagaraj, D. Ravi Kumar, K.S. Suresh, and Suresh Neelakantan
Elsevier BV
M. Nagaraj and B. Ravisankar
Springer Science and Business Media LLC
M. Nagaraj, P. Deena, and B. Ravisankar
Springer Science and Business Media LLC
M. Nagaraj and B. Ravisankar
Springer Science and Business Media LLC
M Nagaraj and B Ravisankar
IOP Publishing
The structural steel IS2062 was processed by equal channel angular pressing (ECAP) at room temperature with 120° channel angle die. The microstructural properties are evaluated and correlated with the mechanical properties of the ECAP processed material. Every subsequent ECAP passes the strength of the sample was improved and the results are attributed by the SPD process which generated higher dislocation density with refined grains. X-ray diffraction line profile analysis was used to determine the crystallite size, lattice strain and dislocation density. TEM analysis confirmed the dislocation structure in deformed samples. The ECAP processed sample exposed an increase in lattice strain and dislocation density with the number of passes and with a reduced crystallite size. Quantitative contributions of individual strengthening mechanisms for the overall yield strength of ECAP sample was analytically calculated. The results illustrate that the significant contribution comes from dislocation density followed by grain boundary strengthening.
Murugan Nagaraj and B. Ravisankar
Elsevier BV
M. Nagaraj and B. Ravisankar
Springer Science and Business Media LLC
S P Divya, G Yoganandan, J N Balaraju, S A Srinivasan, M Nagaraj, and B Ravisankar
IOP Publishing
Aluminium 2014 alloy solutionized at 495°C, aged at 195°C was subjected to Equal Channel Angular Pressing (ECAP). Dry sliding wear tests were conducted using pin on disc tribometer system under nominal loads of 10N and 30N with constant speed 2m/s for 2000m in order to investigate their wear behavior after ECAP. The Co-efficient of friction and loss in volume were decreased after ECAP. The dominant wear mechanism observed was adhesion, delamination in addition to these wear mechanisms, oxidation and transfer of Fe from the counter surface to the Al 2014 pin were observed at higher loading condition. The corrosion behavior was evaluated by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution. The results obtained from PDP showed higher corrosion potential and lower corrosion density after ECAP than base. Electrochemical impedance spectroscopy (EIS) showed higher charge transfer resistance after ECAP. Surface morphology showed decreased pit size and increased oxygen content in ECAP sample than base after PDP.
S. P. Divya, M. Nagaraj, M. Kesavamoorthy, S. A. Srinivasan, and B. Ravisankar
Springer Science and Business Media LLC