J. Mater. Sci. Technol. ›› 2020, Vol. 45: 49-58.DOI: 10.1016/j.jmst.2019.11.017
• Research Article • Previous Articles Next Articles
Lanlan Yanga, Minghui Chenb,*(), Jinlong Wangb, Yanxin Qiaoa, Pingyi Guoa, Shenglong Zhuc, Fuhui Wangb
Received:
2019-07-19
Revised:
2019-09-17
Accepted:
2019-11-06
Published:
2020-05-15
Online:
2020-05-27
Contact:
Minghui Chen
Lanlan Yang, Minghui Chen, Jinlong Wang, Yanxin Qiao, Pingyi Guo, Shenglong Zhu, Fuhui Wang. Microstructure and composition evolution of a single-crystal superalloy caused by elements interdiffusion with an overlay NiCrAlY coating on oxidation[J]. J. Mater. Sci. Technol., 2020, 45: 49-58.
Sample | Ni | Cr | Al | Co | Ta | Mo | W | Re | Y |
---|---|---|---|---|---|---|---|---|---|
N5 | Bal. | 7.0 | 6.2 | 7.5 | 6.5 | 1.5 | 5 | 3.0 | |
NiCrAlY | Bal. | 27 | 11 | 0.5 |
Table 1 Nominal compositions of the single-crystal superalloy N5 and the NiCrAlY coating (wt%).
Sample | Ni | Cr | Al | Co | Ta | Mo | W | Re | Y |
---|---|---|---|---|---|---|---|---|---|
N5 | Bal. | 7.0 | 6.2 | 7.5 | 6.5 | 1.5 | 5 | 3.0 | |
NiCrAlY | Bal. | 27 | 11 | 0.5 |
Fig. 2. Surface and cross-sectional microstructures of the N5 single crystal superalloy with and without an overlay NiCrAlY coating after oxidation at 1050 °C for 500 h: (a, a1) bare N5 alloy; (b, b1) NiCrAlY coated alloy.
Fig. 3. Microstructures of the N5 single crystal superalloy with an overlay NiCrAlY coating after oxidation at 1050 °C for different times: (a, a1) 0 h; (b, b1) 5 h; (c, c1) 20 h; (d, d1) 100 h; (e, e1) 300 h; (f, f1) 500 h.
Site | Ni | Cr | Al | Co | Ta | Mo | W | Re |
---|---|---|---|---|---|---|---|---|
1 | 59.30 | 24.48 | 5.44 | 3.63 | 4.21 | 0.63 | 1.06 | 1.25 |
2 | 60.47 | 14.03 | 6.99 | 4.99 | 7.31 | 0.71 | 3.16 | 2.34 |
3 | 33.47 | 9.27 | 3.88 | 7.03 | 3.81 | 6.56 | 15.68 | 20.40 |
4 | 36.78 | 44.22 | 4.47 | 3.16 | 3.63 | 1.94 | 3.13 | 3.66 |
5 | 59.78 | 20.51 | 4.41 | 4.79 | 3.95 | 1.34 | 4.46 | 0.76 |
6 | 14.72 | 70.65 | 1.17 | 1.50 | 0.71 | 1.71 | 3.76 | 5.76 |
7 | 66.43 | 16.62 | 6.31 | 5.45 | 3.22 | 0.81 | 0.34 | 0.87 |
8 | 66.75 | 13.88 | 8.78 | 2.89 | 6.23 | 0.70 | 0.51 | 0.25 |
9 | 65.03 | 15.48 | 5.58 | 5.89 | 4.06 | 0.72 | 1.60 | 1.67 |
10 | 9.99 | 55.25 | 0.48 | 7.37 | 1.19 | 3.47 | 7.84 | 19.51 |
11 | 64.03 | 9.59 | 5.77 | 2.26 | 5.67 | 1.07 | 4.00 | 2.50 |
Table 2 Chemical compositions at sites shown in Fig. 3 (wt%).
Site | Ni | Cr | Al | Co | Ta | Mo | W | Re |
---|---|---|---|---|---|---|---|---|
1 | 59.30 | 24.48 | 5.44 | 3.63 | 4.21 | 0.63 | 1.06 | 1.25 |
2 | 60.47 | 14.03 | 6.99 | 4.99 | 7.31 | 0.71 | 3.16 | 2.34 |
3 | 33.47 | 9.27 | 3.88 | 7.03 | 3.81 | 6.56 | 15.68 | 20.40 |
4 | 36.78 | 44.22 | 4.47 | 3.16 | 3.63 | 1.94 | 3.13 | 3.66 |
5 | 59.78 | 20.51 | 4.41 | 4.79 | 3.95 | 1.34 | 4.46 | 0.76 |
6 | 14.72 | 70.65 | 1.17 | 1.50 | 0.71 | 1.71 | 3.76 | 5.76 |
7 | 66.43 | 16.62 | 6.31 | 5.45 | 3.22 | 0.81 | 0.34 | 0.87 |
8 | 66.75 | 13.88 | 8.78 | 2.89 | 6.23 | 0.70 | 0.51 | 0.25 |
9 | 65.03 | 15.48 | 5.58 | 5.89 | 4.06 | 0.72 | 1.60 | 1.67 |
10 | 9.99 | 55.25 | 0.48 | 7.37 | 1.19 | 3.47 | 7.84 | 19.51 |
11 | 64.03 | 9.59 | 5.77 | 2.26 | 5.67 | 1.07 | 4.00 | 2.50 |
Fig. 4. Chemical compositions at interface between the NiCrAlY overlay coating and the N5 single crystal superalloy after oxidation at 1050 °C for different times: (a) 5 h; (b) 100 h; (c) 300 h; (d) 500 h.
Fig. 5. EPMA elements mapping at interface between the coating and the superalloy after oxidation at 1050 °C for different times: (a) 5 h; (b) 100 h; (c) 300 h and (d) 500 h.
Fig. 6. Schematic diagram showing microstructure evolution in the alloy near interface at the initial oxidation stage, in conjunction with the Ni-Cr-Al phase diagram (isothermal section at 1050 °C, “1” and “2” denote the composition of the alloy substrate and the NiCrAlY coating, respectively).
Fig. 7. Schematic diagram showing elements (Cr and Re) interdiffusion and the evolution of IDZ, in conjunction with phase diagrams of Cr-Re and of Ni-Cr-Al (isothermal section at 1050 °C, “1” and “2” denote the composition of the alloy substrate and the NiCrAlY coating, respectively).
Fig. 8. Microstructures of the N5 single crystal superalloy near interface after oxidation at 1050 °C for 500 h: (a) bright field TEM image; (b) EDS elemental maps of Ni, Al, Cr, Re, W and Mo; (c) SAED patterns obtained at “1” and “2” in (a); (d) HRTEM images obtained at “1”, “2” and “3” in (a).
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