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Sai Ramudu Meka
Ramudu Meka Sai Assistant Professor mekafmt[at]iitr.ac.in 7060933840
Areas of Interest
  • Surface Engineering, Thermochemical surface treatments for steels
  • powder metallurgy, second-phase dispersion strengthened metal alloys
  • Solid State Phase Transformation, internal precipitation in solids
Educational Details
DegreeSubjectUniversityYear
Ph.DNitriding of iron based binary and ternary alloysUniversity of Stuttgart, Max Planck Institute for Intelligent Systems, Stuttgart2011
M.TechMaterials and Metallurgical EngineeringIIT Kanpur2007
B.E.MetalluryNITK, Surathkal 2002
Refereed Journal Papers
  1. V.M.Rajavel Muthaiah, S.R.Meka, B.Venkata Manoj Kumar*, Development of Dual Phase SiC/Si3N4 Nanostructures on Nanosized SiC particles, under review, Philosophical Magazine Letters.
  2. Nitin Kumar, G.P. Chaudhari, S.R.Meka*, Investigation of low temperature liquid nitriding conditions for 316 stainless steel for improved mechanical and corrosion response, accepted , Transactions of the Indian Institute of Metals.
  3. K.N. Sasidhar and S.R. Meka*, Natural air atmosphere induced surface directed spinodal decomposition in stainless steel, submitted to Corrosion Science.
  4. K.N. Sasidhar and S.R. Meka*, Thermodynamic reasoning for colossal N supersaturation in austenitic and ferritic stainless steels during low-temperature nitridation, Scientific Reports,  volume 9, Article number: 7996 (2019) 
  5. K.N. Sasidhar and S.R. Meka*, Immiscibility regions in iron based ferritic solid solutions and their relevance to thermodynamics and kinetics of nitriding, Philosophical Magazine, Vol. 99, 2019, p 2152-2168.
  6. V.M.Rajavel Muthaiah, S.R.Meka, B.Venkata Manoj Kumar*, Processing of heat treated silicon carbide reinforced aluminium alloy composites, Materials and Manufacturing Processes, Vol. 34:3, 2019, p. 312-320.
  7. K.N. Sasidhar and S.R. Meka*, What causes the colossal C supersaturation of δ-ferrite in stainless steel during low-temperature carburization? Scripta Materialia, Vol. 162, 2019, p. 118-120.
  8. K.N. Sasidhar and S.R. Meka*, Spinodal decomposition during isothermal gas-solid equilibration – Its effects and implications, Acta Materialia, Vol. 161, 2018, p. 266-272.
  9. Z. Hegedus*, S.R. Meka and E.J. Mittemeijer. Insitu consolidation of ball milled metals,  Journal of Alloys and Compounds, Vol. 695, 2017, p. 721-725.
  10. T. Steiner*, S.R. Meka, H. Goehring and E.J. Mittemeijer. Alloying element nitride stability in iron-based alloys; denitriding of nitrided Fe–V alloys, Materials Science and Technology, Vol. 33, 2017, p 23-32.
  11. C.W. Kang, S.R. Meka*, T. Steiner, R.E. Schacherl and E.J. Mittemeijer. Microstructural evolution of 31CrMoV9 steel upon controlled gaseous nitriding treatment, HTM Journal of Heat Treatment and Materials, Vol. 71, 2016, p. 181-190.
  12. M. Akhlaghi*, S.R. Meka, E.A. Jaegle, S.J.B. Kurz, E. Bischoff and E.J. Mittemeijer. Formation mechanisms of alloying element nitrides in recrystallized and deformed ferritic Fe-Cr-Al alloy, Metallurgical and Materials Transactions A. Vol. 47, 2016, p. 4578-4593.
  13. M. Jung,  S.R. Meka* and E.J. Mittemeijer. Incubation time for iron-nitride layer formation upon gaseous nitriding of iron-based alloys, Philosophical Magazine. Vol. 96, 2016, p. 1369-1385.
  14. T. Steiner*, S.R. Meka, B. Rheingans, E. Bischoff, T. Wadenmaier, G. Yeli, T.L. Martin, P.A.J. Bagot, M.P. Moody and E.J. Mittemeijer. Continuous and discontinuous precipitation in Fe-1 at.%Cr-1 at.%Mo alloy upon nitriding; crystal structure and composition of ternary nitrides, Philosophical Magazine. Vol. 95, 2016. p 1509-1537.
  15. T. Steiner*, S.R. Meka, E. Bischoff, T. Waldenmaier and E.J. Mittemeijer. Nitriding of ternary Fe-Cr-Mo alloys; role of the Cr/Mo ratio, Surface and coatings technology. Vol. 291, 2016, p 21-33.
  16. M. Akhlaghi*, T. Steiner, S.R. Meka and E.J. Mittemeijer. Misfit induced changes of lattice parameters in two-phase systems: Coherent/incoherent precipitates in a matrix, Journal of Applied Crystallography, Vol. 49, 2016, p 69-77.
  17. M. Jung*,  S.R. Meka, B. Rheingans and E.J. Mittemeijer. Coupling inward diffusion and precipitation kinetics; the case of nitriding iron-based alloys, Metallurgical and Materials Transactions A. Vol. 47A, 2016, p 1425-1439.
  18. Z. Hegedus*, S.R. Meka and E.J. Mittemeijer. Crystallite growth in nanocrystalline tungsten; rate determining mechanism and the role of contaminations, Acta Materialia, Vol. 105, 2016, p 232-243.
  19. S.R. Meka*, A. Chauhan, T. Steiner, E. Bischoff, P.K. Ghosh and E.J. Mittemeijer. Generating duplex microstructures by nitriding; the nitriding of iron-based Fe-Mn alloy, Materials Science and Technology, Vol. 32, 2016, p 883-889.
  20. M. Akhlaghi*, M. Jung, S.R. Meka, M. Fonovic, A. Leineweber and E.J. Mittemeijer. Dependence of the nitriding rate of ferritic and austenitic substrates on the crystallographic orientation of surface grains; gaseous nitriding of Fe-Cr and Ni-Ti alloys, Philosophical Magazine. Vol. 95, 2015, p 4143-4160.
  21. M. Akhlaghi, T. Steiner, S.R. Meka*, A. Leineweber and E.J. Mittemeijer. Lattice-parameter change induced by accommodation of precipitate/matrix misfit; misfitting nitrides in ferrite, Acta Materialia, Vol. 98, 2015, p 254-262.
  22. T. Steiner, M. Akhlaghi,  S.R. Meka*and E.J. Mittemeijer. Diffraction-line shifts and broadenings in continuously and discontinuously coarsening precipitate-matrix systems; coarsening of initially coherent nitride precipitates in a ferrite matrix, Journal of Materials Science. Vol. 50, 2015, p 7075-7086.
  23. S. Loewy*, B. Rheingans, S.R. Meka and E.J. Mittemeijer. Modulated martensite-formation behavior in Fe-Ni based alloys; athermal and thermally activated mechanisms, Journal of Materials Research, Vol. 30, 2015, p 2101-2107.
  24. S.J.B. Kurz*, S.R. Meka, N. Schell, W. Ecker, J. Keckes, E.J. Mittemeijer. Residual stress and microstructure depth gradients in nitrided iron-based alloys revealed by dynamical cross-sectional transmission X-ray microdiffraction, Acta Materialia, Vol. 87, 2015, p 100-110.
  25. C.W. Kang, S.R. Meka*, R.E. Schacherl and E.J. Mittemeijer. Nitriding response of a quaternary iron-based Fe-2.82at.%Cr-0.13at.%Mo-0.18at.%V alloy, Metallurgical and Materials Transactions A. Vol. 46A, 2015, p 328-336.
  26. B. Schwarz,H. Göhring, S.R. Meka*, R.E. Schacherland E.J. Mittemeijer. Pore formation upon nitriding iron and iron-based alloys; the role of alloying elements and grain boundaries, Metallurgical and Materials Transactions A, Vol. 25A, 2014, p 6173-6186.
  27. S.R. Meka*, E. Bischoff, S.S. Hosmaniand E.J. Mittemeijer. Interrelationships of defects, nitride modification and excess nitrogen in nitrided Fe-4.75 at.% Al alloy, International Journal of Materials Research, Vol. 105, 2014, 11, p 1057-1066.
  28. B. Schwarz, P.J. Rossi, L. Straßberger, F. Jörg, S.R. Meka*, E. Bischoff, R.E. Schacherl, and E.J. Mittemeijer. Coherency strain and precipitation kinetics; crystalline and amorphous nitride formation in ternary Fe-Ti/Cr/V-Si alloys, Philosophical Magazine, Vol. 94, 2014, 27, p 3098-3119.
  29. B. Schwarz, S.R. Meka*, R.E. Schacherl, E. Bischoff and E.J. Mittemeijer. Nitriding of Iron-based Ternary Fe-V-Si Alloy; The Precipitation Process of Separate Nitrides, Acta Materialia, Vol. 76, 2014, p 394-403.
  30. S. Loewy*, B. Rheingans, S.R. Meka and E.J. Mittemeijer. Unusual martensite-formation kinetics in steels: observation of discontinuous transformation rates, Acta Materialia, Vol. 64, 2014, p 93-99.
  31. H. Selg, E. Bischoff, S.R. Meka, R.E. Schacherl*, T. Waldenmaier and E.J. Mittemeijer. Molybdenum-nitride precipitation in recrystallized and cold rolled Fe-1at.%Mo alloy, Metallurgical and Materials Transactions A, Vol. 44A, 2013, p 4059-4070.
  32. J. Stein, R.E. Schacherl*, M. Jung, S.R. Meka, B. Rheingans and E.J. Mittemeijer. Solubility of nitrogen in ferrite; the Fe-N phase diagram, International Journal of Materials Research, Vol. 104,2013, 11, p 1053-1065.
  33. S.R. Meka* and E.J. Mittemeijer. Abnormal nitride morphologies upon nitriding iron-based substrates, JOM, Vol. 65, 2013, p 769-775.
  34. H. Selg, E. Bischoff, I. Bernstein, T. Woehrle, S.R. Meka*, R.E. Schacherl, T. Waldenmaier and E.J. Mittemeijer. Defect-dependent nitride surface-layer development upon nitriding of Fe-1 at.%Mo alloys, Philosophical Magazine, Vol. 93, 2013, p 2133-2160.
  35. H. Selg, S.R. Meka*, M. Kachel, R. Schacherl, T. Waldenmaier and E.J. Mittemeijer. Nitriding behaviour of maraging steel: experiments and modelling, Journal of Materials Science, Vol. 48, 2013, p 4321-4335.
  36. G.K. Rane, U. Welzel, S.R. Meka* and E.J. Mittemeijer. Non-monotonic lattice parameter variation with crystallite size in nanocrystalline solids, ActaMaterialia, Vol. 61, 2013, p 4524-4533.
  37. S.R. Meka*, E. Bischoff, B. Rheingans and E.J. Mittemeijer. Octapod-shaped, nanosized,

amorphous precipitates in a crystalline ferrite matrix, Philosophical Magazine Letters, Vol. 93, 2013, p 238-245.

  1. S.R. Meka*, E. Bischoff, R.E. Schacherl and E.J. Mittemeijer. Unusual nucleation and growth of γ′ iron nitride upon nitriding Fe-4.75at.%Al alloy, Philosophical Magazine, Vol. 92, 2012, p 1083-1105.
  2. S.R. Meka*, K.S. Jung, E. Bischoff and E.J. Mittemeijer. Unusual precipitation of amorphous silicon nitride upon nitriding Fe-2at.%Si alloy, Philosophical Magazine,

Vol. 92, 2012, p 1435-1455.

  1. K.S. Jung, S.R. Meka, R.E. Schacherl*, E. Bischoff and E.J. Mittemeijer. Nitride formation and excess nitrogen uptake upon nitriding ferritic Fe-Ti-Cr alloys, Metallurgical and Materials Transactions A, Vol. 43A, 2012, p 934-944.
  2. S.R. Meka*, R.E. Schacherl, E. Bischoff and E.J. Mittemeijer. Ideally weak nitriding kinetics during gaseous nitriding of Fe-2at.%Si alloy, HTM Journal of Heat Treatment and Materials, Vol. 66, 2011, p 103-108.
  3. S.R. Meka, S.S. Hosmani, A.R. Clauss and E.J. Mittemeijer*. The emergence and disappearance of a high density of microcracks in nitrided Fe-4.65at.%Al alloy, International Journal of Materials Research, Vol. 99, 2008, p 808-814.

* Corresponding author