Microstructure and mechanical properties of spray deposited Ni-based superalloys

Abstract

Three kinds of superalloys were prepared by spray deposited process. The analysis results of microstructures and mechanical properties indicate that the spray deposited preforms with higher integral densification and the oxygen content in each kind of superalloy was very low. The microstructures are consisted of fine grain without dendritic equi-axed. The spray deposited superalloys possessed good ductility. The forging experiment displays that even though the once deformation of spray deposited GH742 alloy more than 60%, the crack can not be found. Meanwhile, the mechanical properties of spray deposited superalloys are significantly increased.

Keywords

spray deposition / Ni-based superalloys / microstructure / mechanical properties

References

[1] Mi G. F., Tian S. F., Zang S. Y., . The Status and Prospect of the Metal Spray Atomization and Deposition Technique[J]. Materials Science & Engineering, 1996, 14(4): 8-13.

[2] Z H Chen, J Teng, H G Yan, et al. A Novel Spray Deposition Technology for the Preparation of Aluminum Alloy and Aluminum Matrix Composite Rings with Large Dimensions[ C]. The 5 ^th Pacific Rim International Conference on Advanced Materials and Processing. Beijing, 2005: 2799–2802

[3] F Shahriarl, F Ashrafizadeh, A Monsh. Formation and Microstructural Characterization of Silicon-modified Aluminide Coating on Nickel-based Superalloy IN738LC[C]. The 14 ^th Congress of International Federation for Heat Treatment and Surface Engineering. Shanghai, 2004: 657–660

[4] Z Li, G Q Zhang, Z H Zhang, et al. Investigation into Hot Deformation Behavior of Spray Formed Superalloy GH742[C]. The 4 ^th International Conference on Physical and Numerical Simulation of Materials and Thermal Treatment. Shanghai, 2004: 1–4

[5] Reed R. C. Superalloys and Coatings for High-temperature Applications[J]. JOM, 2006, 58(1): 36

[6] H C Yu, S S Xie, H C Yang. Tensile Creep Deformation and Damage Behavior in a Nickel-base Superalloy at 900 °C[C]. The 5 ^th China-Japan Bilateral Symposium on High Temperature Strength of Materials. Xi’an, 2004: 142–148

[7] Kim H. C., Kim Y. H., Jung Y. G. Microstructure Evolution with Solidification on Rates in IN738LC Superalloy[J]. Materials Science Forum, 2006, 510/511: 450-453.

[8] Kramb R.C., Antony M.M., Semiatin S.L. Homogenization of a Nickel-base Superalloy Ingot Material[J]. Scripta Materialia, 2006, 54(9): 1645-1649.

[9] China Aeronautical Materials Handbook of 2[M]. Beijing: Chinese Standard Press, 2002: 595

[10] Mi G. F., Li Z., Liang Z. K., . Microstructure Evolution Mechanism during the Spray Deposition of IC6 Superalloy[ J]. Journal of Aeronautical Materials, 1997, 17(1): 1-8.

[11] Liang X., Earthan J. C., Lavernia E. J. On the Mechanism of Grain Formation during Spray Atomization and Deposition[ J]. Acta Metal Master, 1992, 40: 3003-3016.