Isothermal Oxidation Behaviour of Ni-Cr-Co-Mo-W-Ta-Al Superalloy at 900℃ and 1000℃

doi:10.11901/1005.3093.2016.163

Chinese Journal of Materials Research

2016, Vol. 30

Issue (8): 589-594 DOI: 10.11901/1005.3093.2016.163

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Isothermal Oxidation Behaviour of Ni-Cr-Co-Mo-W-Ta-Al Superalloy at 900℃ and 1000℃

LU Xudong^**, WANG Fuli

Department of Weapon Launching Engineering, Shenyang Ligong University, Shenyang 110168, China

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LU Xudong, WANG Fuli. Isothermal Oxidation Behaviour of Ni-Cr-Co-Mo-W-Ta-Al Superalloy at 900℃ and 1000℃. Chinese Journal of Materials Research, 2016, 30(8): 589-594.

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Abstract

The oxidation behavior of a superalloy Ni-4.66Cr-5.87Co-7.54Mo-2.90W-4.97-Ta-6.32Al at 900℃ and 1000℃ in air has been investigated by means of TGA, XRD and SEM/EDAX. Results show that the oxidation rate in the initial stage is rapid, then with the oxidation time the oxidation weight gain tends to be smooth, but the oxidation kinetics curve for the superalloy later presents a wavy-like change and much obviously for the higher oxidation temperature. The oxide scales consist of two layers both at 900℃ and 1000℃. Of which , the outer layer is mainly composed of NiO、Ni₂Cr₂O₄、Ni₂CoO₄ and CoTa₂O_6,while the inner layer is a thin scale of Al₂O₃. The continuous oxide layer of Al₂O₃ is formed on the alloy surface to restrain the growth of oxide scale and decrease the oxidation rate. The precipitates of internal oxide (Al₂O₃) and internal nitride (AlN) formed in the superalloy after exposure for 300h at 900℃ and 1000℃; the internal oxidation zone forms on the surface of the superalloy just beneath the outer layer of the oxide scale, while the internal nitridation zone forms below the internal oxidation zone; with the increasing temperature the internal oxidation zone and internal nitridation zone became thicker, simultaneity the size of internal nitride and internal oxide increases.

Key words: metallic materials Ni-base superalloy isothermal oxidation kinetics curves internal oxidation internal nitridation

Received: 28 March 2016

Fund: *Supported by Financial Support by the Education Department of Liaoning Province No L2012063 and Research Fund for the Doctoral Program of Liaoning Province No 20141088

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.163 OR https://www.cjmr.org/EN/Y2016/V30/I8/589

Fig.1 Oxidation kinetics of superalloy oxidized for 300 h at 900℃ and 1000℃ in air

Fig.2 XRD analysis of Ni-base superalloy oxidized for 300 h at 900℃ and 1000℃

Fig.3 Surface morphologies of Ni-base superalloy oxidized for 300 h at (a) 900℃ and (b) 1000℃

Fig.4 Cross sectional morphologies of Ni-based superalloy after oxidation for 300 h at (a) 900℃ and (b) 1000℃

Fig.5 Cross sectional morphology (a) and (b~i) content distributions of the specimen after oxidation at 1000℃ for 300 h

Table 1 Gibbs free energy for the formation of related compounds (kJmol^-1)

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