Effect of Microcast-X Fine Grain Casting on the Microstructure and Mechanical Properties of K492M Alloy at 760°C

Abstract:

The effect of Microcast-X fine grain casting on the microstructure and mechnical property K492M alloy at 760°C of was investigated. The results indicated that Microcast-X fine grain casting decreased grain size and dendrite space of γ′ phase and γ/γ′ eutectic. In addition, the element segregation decreased significantly compared to conventional casting technique. Also, the size and distribution of MC carbide were improved. By Microcast-X fine grain casting, the tensile strength increased from 934MPa of conventional casting alloy to 1089MPa and the elongation increased from 1.9% to 5.7%. In addition, the stress-rupture life increased from 28.8h of conventional casting alloy to 72.5h. And the fracture mechanism for the alloys by Microcast-X fine grain casting is trans-granular fracture toughness.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 549-556
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.549
• Online since: March 2016
• Authors: Pin Pin Hu*, Qi Dong Gai, Qing Li, Xin Tang
• Keywords: Carbide, K492M Alloy, Microcast-X Fine Grain Casting Microstructure, Stress-Rupture Property, Tensile Property

References

[1] X. Tang, B. Z. Yu, F. X. Liu, M. Han, Q. D. Gai, Investigation on mechanical properties of fine grain cast by mould agitation, J. Aeronaut. Mater. 25(2003) 57-62.

[2] L. LIU, The progress of investment casting of nickel-based superalloys, Foundry. 11(2012) 1273-1285.

[3] W. Michael, Benson. Howard, Development of a conventional fine grain casting process, in: W.J. Boesch, R.T. Grant, M.J. Donachie, F.M. Richmond, L.W. Lherbier, C.T. Sims(Eds. ), TMS, Superalloys 1984, TMS, Champion, PA, 1984, pp.3-12.

DOI: 10.7449/1984/superalloys_1984_3_12

[4] J. R. Brinegar, L. F. Norris, L. Rozenberg, Microcast-X fine grain casting- A progress report, in: W.J. Boesch, R.T. Grant, M.J. Donachie, F.M. Richmond, L.W. Lherbier, C.T. Sims(Eds. ), TMS, Superalloys 1984, TMS, Champion, PA, 1984, pp Superalloy 1984. (1984).

DOI: 10.7449/1984/superalloys_1984_23_32

[5] T. W. Huang , L. Liu, A. M. Yang, Y. H. Xiong, Z. L. Zhao, Effect of structure refinement by addition of refiner on LCF properties of cast superalloy K4169, J. Mater. Eng. 11(2004) 22-27.

[6] Y. H. Xiong, A. M. Yang, P. J. Li, L. Liu, Effects on foundry variables and refiners on cast structures of superalloy K4169, Acta. Metall. Sin. 38(2002) 529-533.

[7] X. Tang, F. X. Liu, M. Han,Q. D. Gai, Investigation of fine grain casting of superalloy, J. Mater. Eng. 9(1997) 57-62.

[8] X. Tang, F. X. L iu, A. L. Li, Q. D. Gai, M. Han, Study on heat treatment processing of k403 fine grain casting, J. Mater. Eng. 10(2001) 45-50.

[9] X. Tang, B. Z. Yu, F. X. Liu, M. Han, Q. D. Gai, Control grain in cast processing for integral turbine wheel of superalloy, Mater. Mech. Eng. 1(20041) 17-19.

[10] W. M. Wang F. X. Liu, X. Tang, Infulence of fine grain casting by mould agitating on the structure and mechanical properties of K418 integral wheels, J. Aeronaut. Mater. 23(1998) 20-22.

[11] J. C. Zhao, P. Yan, Y. F. Peng, X. W. Meng, W. F. Xiao, S. G. Li, L. F. Zhang, X. F. Chen, An advanced precision cast technology for equiaxed fine grain superalloys casting, Aerospace Manufacturing Technol. 6 (2003) 1-5.

[12] J. X. Yang, Y. Sun, T, Jin , X. F. Sun, Z. Q. Hu, Microstructure and mechanical properties of a ni-based superalloy with refined grains, Acta. Metall. Sin. 50(2007) 839-844.

[13] S. M. Seo, I. S. Kim, J. H. Lee, Micro structural in directional solidified Ni-based superalloy IN792+Hf, J. Mater. Sci. Technol. 24(2008) 110-114.

[14] J. Zhang, Effect of Ti and Ta on hot cracking susceptibility of directionally solidified Ni-based superalloy IN792, Scr. Mater, 48(2003) 677–681.

DOI: 10.1016/s1359-6462(02)00559-6

[15] Y. Zhou, A. Volek, R. Singer, Influence of solidification conditions on the castability of nickel-base superalloy IN792, Metal. Mater. Trans. A. 36(2005) 651-656.

DOI: 10.1007/s11661-005-0181-5

[16] M. Petrence, K. Obrtlik, Fatigue behavior of a cast nickle-based superalloy Inconel 792-5A at 700℃, Mater. Tehnol. 40(2006) 175-178.

[17] T. Beck, G. Pitz, H. K. Lang, Thermal-mechanical and isothermal fatigue of IN 792 CC, Mat. Sci. Eng. A, 514(1997) 234-236.

DOI: 10.1016/s0921-5093(97)00281-5

[18] J. X. Yang, Q. Zheng, M. Q. Ji. Effects of different C contents on the microstrucuture, tensile properties and stress-rupture properties of IN 792 alloy, Mat. Sci. Eng. A. 528 (2011) 1534-1539.

DOI: 10.1016/j.msea.2010.11.003

[19] X. H. Li, L. Li, X. Tang, Heat treated microstructure and mechnical properties of IN792 alloy, Mater. Sci. Forum. 788(2014) 493-497.

[20] J. X. Yang, Q. Zheng, H. Y. Zhang, Effects of heat treatments on the microstructure of IN792 alloy, Mat. Sci. Eng. A. 527, (2010) 1016-1021.

[21] L. Zheng, C. B. Xiao, G. Q. Zhang, X. Tang, D. Z. Tang, Solidification and segregation behavior of cast ni-base superalloy IN792, Rare. Metal. Mater. Eng, 41(2012) 1457-1462.

[22] T. Murakumo, T. Kobayashi, Y. Koizumi, H. Harada, Creep behavior of Ni-base single-crystal superalloys with various γ' volume fraction, Acta. Mate. 52(2014)3737-3744.

DOI: 10.1016/j.actamat.2004.04.028