Publications
1. Competitive role of primary γ′ precipitates and annealing twins on the
heterogeneous deformation of a polycrystalline Ni-base superalloy: Crystal
Plasticity modeling and experiments.
Suketa Chaudhary, Namit Pai, G. Appa Rao, Zafir Alam, R. Sankarasubramanian, P.J.
Guruprasad, Indradev Samajdar , Anirban Patra
Journal of Alloys and Compounds 967 (2023) 17178.
DOI: https://doi.org/10.1016/j.jallcom.2023.171783
2. Innovative Isostatic Processing Technologies for Defence and other Strategic
Applications
G. Appa Rao, Vijay Pal Shivran, Dhirendra Sahu and B. Sreenu
Defence Science Journal, Vol. 73, No. 2, March 2023 pp. 147-162
DOI: https://doi.org/10.14429/dsj.73.18636
3. Particle Size Dependent microstructure evolution of Inert Gas Atomized Nickel Base
Superalloy Powders
GLGSB Srinivas Kumar, M. Sateshwar, Aditya Ranjan Sharma, Mithun Palit, Rajdeep
Sarkar, Partha Ghosal and G. Appa Rao
Journal of Alloys and Compounds, 909(2022)164772.
DOI: https://doi.org/10.1016/j.jallcom.2022.164772
4. Microstructure and high temperature tensile behavoiur of Ni‐based superalloy
EP741NP for aerospace applications
Sadananda Behera, Manmath Kumar Dash, N.K. Kumar, R. Mitra and G. Appa Rao
Journal of Materials Engineering and Performance, Published online 20 May 2021,
DOI: https://doi.org/10.1007/s11665021058742
5. Microstructure and mechanical behaviour of an advanced powder metallurgy nickel
base superalloy processed through hot isostatic pressing route for aerospace
applications
B. Sreenu, Rajdeep Sarkar, S.S. Satheesh Kumar, Subhra Deep Chatterjee and G. Appa
Rao
Materials Science and Engineering A 797 (2020) 140254, Published online Sept.2020;
DOI: https://doi.org/10.1016/j.msea.2020.140254
6. Evolution of microstructure and microtexture during hot deformation in an
advanced P/M nickel base superalloy
S.S. Satheesh Kumar, T. Raghu, Pinaki P. Bhattacharjee, G. Appa Rao and Utpal
Borah
Materials Characterization, 146 (2018), pp. 217236
7. Structure property correlations in hot isostatically pressed high strength nickel
base superalloy
B. Sreenu, Subradeep Chatterjee and G. Appa Rao
Transactions of PMAI, Vol. 43(2), (2017) pp. 3341
8. Performance evaluation of coated carbide tools in high speed turning of
advanced P/M nickel based superalloy
Umashanker Gupta, K. Hithesh, N. Srinivasa Rao and G. Appa Rao
Journal of Materials Engineering & Surface Engineering, Vol. 5(6) (2017), pp. 661 665
9. Work hardening characteristics and microstructural evolution during hot
deformation of a nickel superalloy at moderate strain rates
S.S. Satheesh Kumar, T. Raghu, Pinaki P. Bhattacharjee, G. Appa Rao and Utpal
Borah
Journal of Alloys and Compounds, Vol.709 (2017), pp.394‐409.
10. Strain rate dependent microstructural evolution during hot deformation of a hot
isostatically processed nickel base superalloy
S.S. Satheesh Kumar, T. Raghu, Pinaki P. Bhattacharjee, G. Appa Rao and Utpal
Borah
Journal of Alloys and Compounds, Vol.681 (2016), pp.28‐42.
11. Constitutive modelling for predicting peak stress characteristics during deformation
of hot isostatically processed nickel‐base superalloy
S.S. Satheesh Kumar, T. Raghu, Pinaki P. Bhattacharjee, G. Appa Rao and Utpal
Borah
Journal of Materials Science, Vol.50, (2015), pp.6444‐6456
12. Thermo‐mechanical processing, microstructure and tensile properties of a tungsten
heavy alloy
Jitin Das, G. Appa Rao, S.K. Pabi, M. Sankaranarayan and T.K. Nandy
Materials Science and Engineering. A, 613, (2014), pp. 48‐59.
13. Oxidation studies on W‐Nb alloy
Jitin Das, G. Appa Rao, S.K. Pabi, M. Sankaranarayan and T.K. Nandy
Inter. J. of Refractory Metals and Hard Materials, Vol.47, (2014), pp.25‐37.
14. Effect of heat treatment on hot isostatically pressed ytria dispersed nickel based
superalloy and its microstructural investigations
Monica Mohan, R. Subramaian, P.C. Angelo and G. Appa Rao
Trans. PMAI, Vol.40 (1), (2014), pp.87‐92.
15. Microstructure and tensile properties of hot isostatically pressed Ti‐6Al‐4V alloy
B. Sreenu and G. Appa Rao
Trans. PMAI, Vol.40 (1), (2014), pp.78‐86.
16. Reduced activation ferritic martensitic steel and fabrication technologies for
Indian test blanket module in ITER
T. Jayakumar, M.D. Mathew, K. Laha, S.K. Albert, S. Saroja, E. Rajendra Kumar, CVS.
Murthy, G. Padmanabham, G. Appa Rao and S. Narahari Prasad
Fusion Science and Technology, Vol. 65 (2), March (2014), pp.171‐185.
17. Influence of hot isostatic pressing on the microstructure and mechanical properties
of a spray‐formed Al‐4.5 wt.% Cu alloy
S. Devaraj, S. Sankaran, R. Kumar and G. Appa Rao
Journal of Materials Engineering and Performance, Vol. 23 (4), (2014), pp. 1440‐
1450.
18. Hot isostatically pressed materials for defence and space applications
G. Appa Rao, M. Sankaranarayana and S. Balasubramaniam
Defence Science Journal, Vol. 62 (1), (2012), pp. 73‐80.
19. Flow behaviour of a heat treated tungsten heavy alloy
Jiten Das, R. Sarkar, G. Appa Rao, M. Sankaranarayana, T.K. Nandy and S.K. Pabi
Materials Science and Engineering A, 553, (2012), pp. 119–127
20. Influence of HIP processing on microstructure and mechanical properties of
superalloy Udimet 720LI
G. Appa Rao and DVV. Satyanarayana
Materials Science and Technology, Vol.27 (2), (2011), pp. 480‐486.
21. Deformation behaviour of a newer tungsten heavy alloy
Jiten Das, G. Appa Rao, S.K. Pabi, M. Sankaranarayana and B. Sarma
Materials Science and Engineering A, 528, (2011), pp. 6235– 6247.
22. High temperature low cycle fatigue behavior of hot isostatically pressed superalloy
Udimet 720LI
Kartik Prasad, Rajdeep Sarkar, Partha Ghosal, G. Appa Rao and Vikas Kumar
Materials at high temperature, Vol.27, (4), (2011), pp.295‐300
Consolidation of mechanically alloyed oxide dispersion strengthened 9Cr‐
martensitic steel by hot isostatic pressing
S. Kavitha, R. Subramaniam, P.C. Angelo and G. Appa Rao
Trans. of PMAI, Vol.36, (2010), pp. 117‐120.
24. Microstructure and mechanical properties of tungsten heavy Alloys
Jiten Das, G. Appa Rao and S.K. Pabi
Materials Science and Engineering A, 527, (2010), pp. 7841‐7847
25. Hot consolidation and mechanical properties of nanocrystalline equiatomic
AlFeTiCrZnCu high entropy alloy after mechanical alloying
S. Varalakshmi, G. Appa Rao, M. Kamraj and B.S. Murty
Journal of Materials Science, Vol. 45, (2010), pp. 5158‐5163.
26. Structure property correlations in hot isostatically pressed AISI‐304 stainless steel
G. Appa Rao, DVV. Satyanarayana, M. Srinivas and D.S. Sarma
Powder Metallurgy, Vol.52 (3), (2009), pp. 244‐249.
27. Microstructure and mechanical behaviour of hot isostatically pressed materials
for aerospace applications
G. Appa Rao, S. Balasubramaniam and DVV. Satyanarayana
Metals Materials and Processes, Vol.19, No.1‐4(2007), pp.321‐338
28. Effect of oxygen content of powder on microstructure and mechanical properties of
hot isostatically pressed superalloy Inconel 718
G. Appa Rao, M. Srinivas and D.S. Sarma
Mater. Sci. and Eng. A, 435‐436, (2006), pp .84‐96.
29. Influence of modified processing on structure and properties of hot isostatically
pressed superalloy Inconel 718
G. Appa Rao, M. Srinivas and D.S. Sarma
Mater. Sci. and Eng. A, 418, (2006), pp .282‐291.
30. Effect of thermo-mechanical working on microstructure and mechanical properties
of hot isostatically pressed superalloy Inconel 718
G. Appa Rao, M. Srinivas and D.S. Sarma
Mater. Sci. and Eng. A, 383, (2004), pp.201‐212.
31. Effect of solution treatment temperature on microstructure and mechanical
properties of hot isostatically pressed superalloy Inconel 718
G. Appa Rao, M. Srinivas and D.S. Sarma
Mater. Sci. and Technol. Vol.20, (9), (2004), pp.1161‐1170.
32. Effect of standard heat treatment on the microstructure and mechanical properties of
hot isostatically pressed superalloy Inconel 718
G. Appa Rao, Mahendra Kumar, M. Srinivas and D.S. Sarma
Mater. Sci. and Eng. A, 355, (2003), pp.114‐125.
33. Characterisation of hot isostatically pressed superalloy Inconel 718
G. Appa Rao, K. Satya prasad, Mahendra Kumar, M. Srinivas and D.S. Sarma
Mater. Sci. and Technol. Vol.19, (3), (2003), pp. 313‐321
34. Yttria dispersion strengthening of P/M (HIP) processed 304 stainless steel
G. Appa Rao, A. Laxminarayana and Mahendra Kumar
Advances in Powder Materials Processing, Trans. PMAI, Vol.26, (1999), pp.159‐165.
35. High performance stainless steel via powder metallurgy hot isostatic pressing
G. Appa Rao and Mahendra Kumar
Mater. Sci. and Technol. Vol.13, (1997), pp.1027‐1031
36. Processing of Inconel 718 by powder metallurgy hot isostatic pressing P/M (HIP)
route
G. Appa Rao, S. Balasubramaniam and Mahendra Kumar
Trans. PMAI, Vol.24, (1997), pp.12‐21
37. Process parameters for bonding OFHC copper and Cu powder by CIP‐ and ‐sinter
route
G. Appa Rao, S. Sarvat Ali and E.S. Bhagiradha Rao
Trans. PMAI, Vol.18, (1991), pp. 27‐30.
Patents
Nickel base superalloy compositions for processing through powder metallurgy route to realize the high performance material for aeronautical turbo-machinery applications. R. Sankara Subramnaian, R. Ramakrishnan, kaushalendra kumar, Ashish Pathak and G. Appa Rao Indian Patent Application filed. (June 2022)
A process for manufacture of dual‐material near‐net shape shrouded integral turbine rotors with the aid of split‐ring capsule and two‐step consolidation/diffusion bonding of pre‐alloyed powders by hot isostatic pressing. G. Appa Rao, MAH. Baigh, R. Pradyumna, B. Sreenu, G. Shobhan Rao and RD. Sharma. Indian Patent Application No: 201711038534 (Nov. 2017)
Process for preparing fused silica based structure. G. Appa Rao, Vijay Pal Shivran, Dhirendra Sahu and P. John Sree Indian Patent Application No: 201611032025 (Nov. 2016)