OM study of effect of hip and heat treatments on microstructural restoration in cast nickel-based superalloy, GTD-111
Keywords:Hot Isostatic Pressing (HIP), Rejuvenation, Microstructural Repair, and Nickel-Based Superalloy
AbstractThe present work aims at studying and searching for the effect of repairing conditions on microstructural restoration. It also seeks to investigate into the most suitable and practicable repairing condition, 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, cast nickel-based superalloy grade GTD-111 operated by Electricity Generating Authority of Thailand (EGAT). During solution treatment, coarse carbides and over-exposed coarse gamma prime precipitates, which had formed previously during service, would dissolve into the matrix. 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, H. 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. Trans. ASME. 124 : 571-579.
Wangyao, P., Korath, T., Harnvirojkul, T. and Homkajai, W. 2004. Effect of Re- Heat treatment conditions on microstructural refurbishment of nickel base superalloy turbine blade 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. Mat. 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., Joypradit, S., Tuengsook, P., Hromkrajai, W. and Khunthon, S. 2004. Effect of HIP parameters on microstructural repair and rejuvenation in longterm 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.
Wangyao, P., Polsilapa, S. and Nisaratanaporn, E. 2005. The application of hot isostatic pressing process to rejuvenate serviced cast superalloy turbine blades. Acta Met. Slovaca. 11(2) : 196-206.
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 nickel-based superalloy. GTD-111. High. Temp. Mater. Process. (In Press 2007)
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