OM study of effect of hip and heat treatments on microstructural restoration in cast nickel based superalloy, IN-738
Keywords:Hot Isostatic Pressing (HIP), Rejuvenation, Microstructural Repair, Nickel-Based Superalloy
AbstractThe present work aims at studying and searching for the most suitable and practicable repairing condition for microstructural restoration, which could provide the desired microstructural characteristics by rejuvenation method of hot isostatic pressing (HIP), followed by 12 heat treatment conditions for long-term serviced gas turbine blades made of cast nickel base superalloy grade IN-738 operated by Electricity Generating Authority of Thailand (EGAT). During heat treatment process, coarse carbides and overexposed coarse gamma prime precipitates, which had formed previously during service, would dissolve into the matrix during solution treatment. Then specimens were processed through a series of precipitation aging, which re-precipitated the strengthening phase to form the proper morphology in size and shape as well as distribution that is almost similar to the new one. Metallography examination had been performed by using light optical microscopy after hot isostatic pressing and heat treatments to evaluate the rejuvenated microstructures.
Daleo, J. A., Ellison, K. A. and Boone, D. H. 2002. Metallurgical considerations for life assessment and the safe refurbishment and requalification of gas turbine blades. J. Eng. Gas Turb Power. 124 : 571-579.
Wangyao, P., Korath, T., Harnvirojkul, T., Saengkiettiyut, K. and Homkajai, W. 2004. Effect of Re- Heat treatment conditions on microstructural refurbishment of nickel based superalloy turbine blades, In-738, after long-term service. J. Met. Mater. Miner. 14(1) : 49-59.
Kvackaj, T., Zrnik, J., Vrchovinský V. and Wangyao, P. 2002. Controlled rolling of Hastelloy-N. High Temp. Mater. Process. 21(6) : 351-359.
Kvackaj, T., Zrnik, J., Vrchovinský, V. and Wangyao, P. 2003. Influence of plastic deformation on creep behavior of NiMoCr alloy. High. Temp. Mater. Proc. 22(1) : 57-62.
Lothongkum, G., Khuanleang, V., Homkrajai, W. and Wangyao, P. 2006. Effect of aging on stress relaxation of Inconel X-750 bolt at 650˚C and 760˚C. High Temp. Mater. Process. 25(4) : 175-186.
Wangyao, P., Kraus, L., Zrnik, J. and Nemecek, S. 2007. Effect of deformation condition on structure development in nickel base alloy. J. Mat. Proc. Tech. 26(3) : 177-184.
Wangyao, P., Joypradit, S. P., Tuengsook, Hromkrajai, W. and Khunthon, S. 2004. Effect of HIP parameters on microstructural repair and rejuvenation in long-term service turbine blade. J. Met. Mater. Miner. 14(1) : 89-94.
Wangyao, P., Krongtong, V., Hromkrajai, W., Tuengsook, P. and Panich, N. 2006. The relationship between reheat-treated microstructures and hardness in cast nickel base superalloy, GTD-111. J. Met. Mater. Miner. 16(1) : 55-62.
Wangyao, P., Lothongkum, G., Krongtong, V., Pailai, S. and Polsilapa, S. 2005. Effect of heat treatments after HIP process on microstructure refurbishment in cast nickel base superalloy, IN-738. J. Met. Mater. Miner. 15(2) : 69-78.
Zrnik, J., Semenak, J., Wangyao, P., Vrchovinsky, V. and Hornak, P. 2003. Analysis of low cycle fatigue behavior in nickel base superalloy. J. Met. Mater. Miner. 12(2) : 33-40.
Wangyao, P., Krongtong, V., Panich, N. Chuankrerkkul, N. and Lothongkum, G. 2007. Effect of 12 heat treatment conditions after HIP process on microstructural refurbishment in cast nickelbased superalloy, GTD-111. High Temp. Mater. Process. 26(2) : 151-159.
Wangyao, P., Zrnik, J., Vrchovinsky, V., Novy, Z. and B. Kasanicka, 2003. Analysis of Creep Behavior in Annealed Nickel Base Alloy. J. Met. Mater. Miner. 12(2) : 67-73.
Wangyao, P., Zrnik, J., Kasl, J., Novy, Z. and Komolwit, P. 2003. The application of electron channeling contrast mode to study recrystallization process in nickel alloy after different thermomechanical processing conditions. J. Met. Mater. Miner. 12(2) : 51-57.
Wangyao, P., Polsilapa, S. and Nisaratanaporn, E. 2005. The application of hot isostatic pressing process to rejuvenate serviced cast superalloy turbine blades. Acta Metall. Slovaca. 11(2) : 196-206.
Zrník, J., Jenčuš, P., Lukáš, P., Horňak, P. and Wangyao, 2004. P. Stress evolution in nickel base superalloy subjected to thermal cycling. J. Met. Mater. Miner. 13(2) : 25-31.
Wangyao, P., Zrník, J., Kvackaj, T. and Komolwit, P. 2004. Microstructure development by hot and cold working process in nickel base alloy. J. Met. Mater. Miner. 13(2) : 33-43.
Wangyao, P., Zrník, J., Kvackaj, T., Vrchovinsky, V. and Novy, Z. 2004. Effect of forming parameters on hot working process in nickel base alloy. J. Met. Mater. Miner. 13(2) : 1-10.
Wangyao, P. and Zrník, J. 2004. TEM analysis of dislocation substructure development after thermomechanical processing in nickel base alloy. J. Met. Mater. Miner. 13(2) : 17-23.
Wangyao, P., Zrnik, J., Nisaratanaporn, E. Vrchovinsky V. and Hornak, P. 2004. The study of isothermal and anisothermal deformation behavior on polycrystalline wrought nickel base superalloy. J. Met. Mater. Miner. 13(2) : 53-63.
Vrchovinsky, V. Zrník, J. Kvackaj, T. and Wangyao, P. 2005. Effect of cold rolling conditions on creep behavior in nickel base alloy. J. Met. Mater. Miner. 15(2) : 57-68.
Ratanamahasakul, S. Lothongkum, G. and Wangyao, P. 2004. Effect of aging conditions on microstructure and mechanical properties in iron-based alloy. J. Met. Mater. Miner. 14(1) : 39-48.
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