Heat Treatment of a Ni₃Al-Based Single Crystal Alloy IC32

Abstract:

C32 is a new type of Ni₃Al-based single crystal alloy, which has been designed to serve at 1200. The effect of heat treatment on the microstructure of single crystal superalloy IC32 was investigated. The microstructure after heat treatment under different solution and aging temperature was examined by using optical microscope (OM), scanning electron microscopy (SEM) and electron probe microscopic analyzer (EPMA). The as-cast microstructure of IC32 consisted of a two-phase γ/γ microstructure, and primary bulky γ phase which priciptated in the interdendritic region. The incipient melting temperature of IC32 is 1360, and the heat treatment window is about 40. Considering high contents of refractory elements Re and Ta, a complicated 18 hours solution heat treatment at different temperatures was conducted to elimate the segregation and dissolove the primary bulky γ phase. The optimum heat treatment of IC32 alloy is 1325/4h+1335/4h+1345/10h, ac + 1165/2h, ac + 870/32h, ac.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 665-671
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.665
• Online since: February 2013
• Authors: Dong Liang Cui, Xiao Ying Xie, Shu Suo Li, Heng Zhang, Sheng Kai Gong
• Keywords: Heat Treatment, Microstructure, Ni₃Al-Based Single Crystal Alloy

References

[1] J.R. Davis (Ed. ), Directionally solidified and single crystal superalloys. Heat Resistant Materials — ASM Specialty Handbook, ASM International, Materials Park, OH, 1997, p.255.

[2] Fuchs GE. Improvement of creep strength of a third generation single-crystal Ni-base superalloy by solution heat treatment. Journal of Materials Engineering and Performance 2002; 11(1): 19-25.

DOI: 10.1007/s11665-002-0003-5

[3] Fuchs GE. Solution heat treatment response of a third generation single crystal Ni-base superalloy. Materials Science and Engineering A 2001; 300: 52-60.

DOI: 10.1016/s0921-5093(00)01776-7

[4] Sajjadi SA, Zebarjad SM, Guthrie RIL, Isac M. Microstructure evolution of highperformance Ni-base superalloy GTD-111 with heat treatment parameters. Journal of Materials Processing Technology 2006; 175: 376-81.

DOI: 10.1016/j.jmatprotec.2005.04.021

[5] He LZ, Zheng Q, Sun XF, Guan HR, Hu ZQ, Tieu AK, et al. Effect of heat treatment on microstructures and tensile properties of Ni-base superalloy M963. Materials Science and Engineering A 2005; 398: 128-36.

DOI: 10.1016/j.msea.2005.03.021

[6] Hu ZQ, Liu LR, Jin Tao, Sun XF. Development of the Ni-Base Single Crystal Superalloys. ACTA AERONAUTICA ET ASTRONAUTICA SINICA 2005; Vol. 31, No. 3: 1-7.

[7] Li ping, Li SS, Han YF. Influence of solution heat treatment on microstructure and stress rupture properties of a Ni3Al base single crystal superalloy IC6SX. Intermetallics 19(2011) : 182-186.

DOI: 10.1016/j.intermet.2010.08.019

[8] Caron P., Khan T. Evolution of Ni-base superalloys for single crystal gas turbine blade applications[J]. Aerosp. Sci. Technol., 1999(3): 513-532.

DOI: 10.1016/s1270-9638(99)00108-x

[9] S.R. Hegde, R.M. Kearsy, J.C. Beddoes. Designing homogenization-solution heat treatments for single crystal superalloys. Materials Science and Engineering A 527 (2010) 5528-5538.

DOI: 10.1016/j.msea.2010.05.019

[10] Caron P., Henderson P. J., Khan T. On the effects of heat treatments on the creep behavior of a single crystal superalloy[J]. Scripta Metallurgical, 1986, 20: 875-880.

DOI: 10.1016/0036-9748(86)90458-8

[11] Koji Kakehim, Mater. Trans., JIM 40 (1999) 159–167.

[12] Li ping, Li SS, Han YF. Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni3Al Base Single Crystal Alloy IC6SX. Cailiaogongcheng 2009; Supplement: 131-135.

DOI: 10.1016/j.intermet.2010.08.019

[13] Muller L, Glatzel U, Feller-kniepmeier M. Modlingthermal Misfit Stresses in Mickel-Base Superalloys Containing Highvolume Fraction Phase[J]. Acta Metal Mawr, 1992, 40(6): 1321.

DOI: 10.1016/0956-7151(92)90433-f

[14] P Caron and T Khan. Material Science and Engineering, 1983, 61: 173.