J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (11): 2537-2542.DOI: 10.1016/j.jmst.2019.05.003
• Orginal Article • Previous Articles Next Articles
Sun Jingxiaab, Liu Jinlaia, Liu Lirongb, Zhou Yizhoua, Li Jinguoac, Sun Xiaofenga*()
Received:
2018-11-16
Revised:
2019-01-19
Accepted:
2019-02-01
Online:
2019-11-05
Published:
2019-10-21
Contact:
Sun Xiaofeng
About author:
1The authors equally contributed to this work.
Sun Jingxia, Liu Jinlai, Liu Lirong, Zhou Yizhou, Li Jinguo, Sun Xiaofeng. Effects of Al on microstructural stability and related stress-rupture properties of a third-generation single crystal superalloy[J]. J. Mater. Sci. Technol., 2019, 35(11): 2537-2542.
Alloy | Cr | Co | Mo + W + Ta | Al | Re | Hf | Ni |
---|---|---|---|---|---|---|---|
S1 | 3 | 12 | 15 | 6.1 | 5 | 0.1 | balance |
S2 | 3 | 12 | 15 | 5.7 | 5 | 0.1 | balance |
Table 1 Nominal chemical compositions of experimental alloys (wt%).
Alloy | Cr | Co | Mo + W + Ta | Al | Re | Hf | Ni |
---|---|---|---|---|---|---|---|
S1 | 3 | 12 | 15 | 6.1 | 5 | 0.1 | balance |
S2 | 3 | 12 | 15 | 5.7 | 5 | 0.1 | balance |
γ′ morphology | γ′ volume fraction (%) | γ′ size (μm) | γchannel width (nm) | |
---|---|---|---|---|
S1 | Cuboidal | 70.0 | 0.30 | 60 |
S2 | Cuboidal | 67.0 | 0.34 | 65 |
Table 2 γ′ morphology, γ′ volume fraction, γ′ size and γ channel width in the dendrite core of experimental alloys after full heat treatment.
γ′ morphology | γ′ volume fraction (%) | γ′ size (μm) | γchannel width (nm) | |
---|---|---|---|---|
S1 | Cuboidal | 70.0 | 0.30 | 60 |
S2 | Cuboidal | 67.0 | 0.34 | 65 |
Fig. 2. Morphologies of γ′ phase in dendrite core of S1 alloy (a)-(c), S2 alloy (d)-(f) alloys after thermal exposure for 100 h (a, d), 500 h (b, e) and 1000 h (c, f) at 1100 °C.
Fig. 5. Morphologies of TCP phases in dendrite core under backscattering mode of S1 alloy (a)-(c), S2 alloy (d)-(f) alloys after thermal exposure for 100 h (a) and (d), 500 h (b) and (e) and 1000 h (c, f) at 1100 °C.
Fig. 7. Rafted microstructures of two experimental alloys stress ruptured under 1120 °C/137 MPa, light phase is γ, dark phase is γ′: (a) S1 and (b) S2 alloy.
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