1. Ravindra Kumar, Y. Chandra Sharma, V. V. Sagar and D. Bhardwaj, “Characterization of Low Temperature Plasma Ion Nitriding (PIN) of Inconel 600 and 601 Alloys” Iranian Journal of Materials Science & Engineering, Vol. 17, No. 2, June 2020.

2. Y. C. Sharma, Ravindra Kumar, Vajja Vidyasagar and Dheeraj Bhardwaj, "Low temperature plasma ion nitriding (PIN) of Inconel 690 alloy" Mater. Res. Ex[press 6, 026559, 2018.

3. Ravindra Kumar, Dheeraj Bhardwaj and Y. C. Sharma, "A Review on Plasma Ion Nitriding (PIN) Process" Journal on Material Science, 6(1), 31-44, 2018. 

4. Ravindra Kumar, A. K. Srivastava and S. Konar, "Evaluation of Surface Properties of Various Plasma Nitrided Low Alloy Steels" Adv. Sci. Lett. Vol. 22, 3919–3923, 2016.

5. Ravindra Kumar, Ram Prakash, J. Alphonsa, Jalaj Jain, A. Pareek, P. A. Rayjada, P. M. Raole and S. Mukherjee, "Impact of forging conditions on plasma nitrided hot-forging dies and punches" Journal of Materials Science Research; Vol. 1, No. 4; 2012.

6. Ravindra Kumar, J Alphonsa, Ram Prakash, K S Boob, J Ghanshyam, P A Rayjada, P M Raole, and S Mukherjee, "Plasma nitriding of AISI 52100 ball-bearing steel and effect of heat-treatment on nitrided layer" Bull. of Material Sci.,Vol.34, No.1, pp. 153-159, 2011.

Published in conferences:

Attended and presented a paper title “ Plasma Ion Nitriding of Non-ferrous Alloys” in International Conference on Contemporary Trends in Multidisciplinary Research and Innovation (ICCTMRI-2023), organized by BIT Mesra, Jaipur Campus during 27-28 July-2023.

Attended and presented a paper title “ Plasma Ion Nitriding and Characterization Techniques” in International Conference on Recent Trends in Engineering and Sciences (RTES-2023), organized by SVNIT, Surat during 2-3 May-2023.

Ravindra Kumar, Yogesh Chandra Sharma, Vajja Vidyasagar, and Dheeraj Bhardwaj, "Wear behavior of plasma nitrided inconel 690 alloy" AIP Conference Proceedings, 2115, 030282, 2019. 

Ravindra Kumar, Ram Prakash and S. Konar, "Plasma Nitriding System for Surface Engineering of Industrial Components" National Conferernce of Vacuum Electronics Device Application (VEDA)-2012, Central Electronics Engineering Research Institute (CEERI-Pilani), 21st - 24th September 2012. 

Ravindra Kumar, Ram Prakash, J. Alphonsa, Jalaj Jain, A. Pareek, P. A. Rayjada, P. M. Raole and S. Mukherjee "Impact of forging conditions on plasma nitrided hot-forging dies and punches" in the conference series of Recent Development in Engineering materials (RDME), which is organized by Birla Institute of Technology, Mesra Ranchi during 12^th – 14^th May 2011.

O. P. Rishi, M. Sharma, Ravindra Kumar and R. Prakash, "Case Based Reasoning for identification of Process Parameters in Plasma Nitriding Process" , in the conference series of Recent Development in Engineering materials (RDME), which is organized by Birla Institute of Technology, Mesra Ranchi during 12^th – 14^th May 2011.