Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980 °C

doi:10.1007/s40195-017-0598-z

Abstract

Abstract:

The isothermal oxidation behavior of the nickel-based superalloy DZ125 was investigated at 980 °C through SEM/EDX and XRD. The weight loss process exhibited three periods—initial, transient and steady stages, which correspond to the formation of three layers on the surface. The outer layer was composed of NiO, whereas the intermediate layer mainly consisted of spinels and was accompanied with Ta-rich oxide. Alumina was evident as the inner continuous layer close to the substrate. The first formation of alumina was responsible for the initial stage of weight loss, and the formation of NiO and intermediate layer may dramatically affect on the transient and steady stage, respectively. The oxide scales effect on growth mechanism was discussed.

Key words: Nickel-based, Superalloy, Oxidation, Alumina

Ye-Bing Hu, Li Zhang, Cong-Qian Cheng, Peng-Tao Zhao, Guang-Ping Guo, Jie Zhao. Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980 °C[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(9): 857-862.

Figures/Tables 10

Table 1 Chemical composition of DZ125 (wt%)

C	Cr	Al	Co	Ti	W	Ta	Hf	Mo	B	Ni
0.09	8.68	5.24	9.80	0.94	7.08	3.68	1.52	2.12	0.012	Bal.

Fig. 1 Microstructure of DZ125 before the isothermal oxidation tests

Fig. 2 Variation of specific mass gain with oxidation time of DZ125 at 980 °C

Fig. 3 Oxide morphology and chemical composition of the DZ125 at 980 °C at different exposure time: a after oxidation for 0.5 h, whereas the region 1, 2 and 3 represented the different oxides which formed on the surface; b oxidation for 45 h; c region 3 was covered by the region 1 after oxidation for 334 h

Table 2 Chemical content of main elements in typical phase zone after oxidation at 980 °C in Fig. 2

Point	Element content (wt%)
Point	O	Al	Ni	Co	Cr	W	Ti	Ta
1	29.6	0.7	62.6	7.1	-	-	-	-
2	28.8	7	36.3	6.6	4.8	-	0.8	-
3	23.6	-	15.4	3.6	6.2	-	4.4	46.9
4	37.2	25.1	26.8	6.7	4.3	-	-	-
5	37.7	33.4	19.5	5.6	3.9	-	-	-
6	47.7	45.8	4.4	-	2.1	-	-	-

Fig. 4 Cross-sectional BSE image of nickel-based superalloy DZ125 after exposure for 334 h

Fig. 5 XRD patterns of specimen after oxidation for 334 h

Fig. 6 Effect of exposure time on the thickness of different layer of DZ125

Fig. 7 Schematic illustration of the growth mechanism of oxide scale of the nickel-based superalloy DZ125 at 980 °C: a oxidation at the initial stage; b oxidation at the transient stage; c oxidation at the steady stage

Table 3 Oxidation and depleted reaction index of DZ125 at different oxidation periods

Reaction index	Periods
Reaction index	Transient stage	Steady stage
n	0.46	0.179
m	0.462	0.171

References

[1]	R.Z. Wang, B. Chen, X.C. Zhang, S.T. Tu, J. Wang, C.C. Zhang, Int. J. Fatigue 97, 190-201 (2017)
[2]	S.H. Cho, S.K. Lee, D.Y. Kim, J.H. Lee, J.M. Hur, J. Alloys Compd. 695, 2878-2885 (2017)
[3]	A. Srivastava, S. Gopagoni, A. Needleman, V. Seetharaman, A. Staroselsky, R. Banerjee, Acta Mater. 60, 5697-5711 (2012)
[4]	M.Z. Alam, D. Chatterjee, B. Venkataraman, V.K. Varma, D.K. Das, Mater. Sci. Eng. A 527, 6211-6218 (2010)
[5]	A.L. Hutsona, T. Nicholasb, S.E. Olsona, N.E. Ashbaugha, Int. J. Fatigue 23, 445-453 (2001)
[6]	M. Bensch, C.H. Konrad, E. Fleischmann, C.M.F. Rae, U. Glatzel, Mater. Sci. Eng. A 577, 179-188 (2013)
[7]	Z.X. Wen, H.Q. Pei, Z.F. Yue, High Temp. Mater. Process. 35, 871-880 (2016)
[8]	C.F. Miller, G.W. Simmons, R.P. Wie, Scr. Mater. 48, 103-108 (2003)
[9]	A.A.N. Acta Mater. 126, 361-371 (2017)
[10]	S. Cruchely, H.Y. Li, H.F. Evans, P. Bowen, D.J. Child, M.C. Hardy, Int. J. Fatigue 81, 265-274 (2015)
[11]	H.E. Evans, Int. Mater. Rev. 40, 1-40 (1995)
[12]	J. Brenneman, J. Wei, Z. Sun, L. Liu, Y. Zhou, Corros. Sci. 100, 267-274 (2015)
[13]	M.P. Taylor, H.E. Evans, S. Stekovic, M.C. Hardy, Mater. High Temp. 29, 145-150 (2012)
[14]	A. Pfennig, B. Fedelich, Corros. Sci. 50, 2484-2492 (2008)
[15]	S. Dryepondt, D. Monceau, F. Crabos, E. Andrieu, Acta Mater. 53, 4199-4209 (2005)
[16]	X.Y. Yuan, Y.T. Yao, L.Q. Chen, Acta Metall. Sin. (Engl. Lett.) 27, 401-406 (2014)
[17]	H.Q. Pei, Z.X. Wen, Z.F. Yue, J. Alloys Compd. 704, 218-226 (2017)
[18]	S.J. Park, S.M. Seo, Y.S. Yoo, H.W. Jeong, H.J. Jang, Corros. Sci. 90, 305-312 (2015)
[19]	N. Halem, M. Abrudeanu, G. Petot-Ervas, Mater. Sci. Eng. B 176, 1002-1009 (2011)
[20]	A. Sato, Acta Mater. 59, 225-240 (2011)
[21]	J. Chapovaloff, F. Rouillard, K. Wolski, M. Pijolat, Corros. Sci. 69, 31-42 (2013)
[22]	D.A. Jones, Principles and Prevention of Corrosion, 2nd edn. (Prentice Hall Press, Upper Saddle River, 1996)