J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (8): 790-798.DOI: 10.1016/j.jmst.2016.01.020
• Orginal Article • Previous Articles
Tian Sugui1,*(),Zhu Xinjie1,Wu Jing1,Yu Huichen2,Shu Delong1,Qian Benjiang1
Received:
2015-11-26
Accepted:
2016-01-08
Online:
2016-08-10
Published:
2016-10-10
Contact:
Tian Sugui
Tian Sugui,Zhu Xinjie,Wu Jing,Yu Huichen,Shu Delong,Qian Benjiang. Influence of Temperature on Stacking Fault Energy and Creep Mechanism of a Single Crystal Nickel-based Superalloy[J]. J. Mater. Sci. Technol., 2016, 32(8): 790-798.
Cr | Co | W | Mo | Al | Ta | Re | Ni |
---|---|---|---|---|---|---|---|
4.10 | 9.21 | 9.12 | 2.10 | 6.12 | 7.12 | 2.11 | Bal. |
Table 1. Chemical compositions of the single crystal nickel-based superalloy (mass fraction, %)
Cr | Co | W | Mo | Al | Ta | Re | Ni |
---|---|---|---|---|---|---|---|
4.10 | 9.21 | 9.12 | 2.10 | 6.12 | 7.12 | 2.11 | Bal. |
Elements | Conversion coeff. (Ai) at 760?°C | Conversion coeff. (Ai) at 980?°C | Conversion coeff. (Ai) at 1070?°C |
---|---|---|---|
Cr | 0.838 | 0.895 | 0.904 |
Co | 0.835 | 0.893 | 0.903 |
W | 1.00 | 1.00 | 1.000 |
Mo | 0.746 | 0.830 | 0.860 |
Ta | 0.853 | 0.916 | 0.927 |
Re | 0.587 | 0.745 | 0.771 |
Table 2. Equivalent conversion coefficients of components Me(i) at different temperatures
Elements | Conversion coeff. (Ai) at 760?°C | Conversion coeff. (Ai) at 980?°C | Conversion coeff. (Ai) at 1070?°C |
---|---|---|---|
Cr | 0.838 | 0.895 | 0.904 |
Co | 0.835 | 0.893 | 0.903 |
W | 1.00 | 1.00 | 1.000 |
Mo | 0.746 | 0.830 | 0.860 |
Ta | 0.853 | 0.916 | 0.927 |
Re | 0.587 | 0.745 | 0.771 |
Temperature (°C) | Stacking fault energy (mJ/m2) |
---|---|
760 | 128.1 |
980 | 281.2 |
1070 | 349.1 |
Table 3. Stacking fault energy of γ′ phase in the used alloy at different temperatures
Temperature (°C) | Stacking fault energy (mJ/m2) |
---|---|
760 | 128.1 |
980 | 281.2 |
1070 | 349.1 |
Fig. 4. Dislocation configuration within the γ′ phase after alloy crept for 241?h up to fracture at 760?°C/810?MPa: (a)g?=?002, (b) g ?=?020, (c)g= 1 ˉ 13 .
Fig. 5. Dislocation configurations within the γ′ phase after the alloy crept for 163?h up to fracture at 980?°C/300?MPa: (a) g?=?020, B ?=?[100], (b) g=02 2 ? , B?=?[100], (c) g?=?002, B?=?[100], (d) g?=?022, B?=?[100].
Fig. 6. Dislocation configuration within the γ′ phase after alloy crept for 133?h up to fracture at 1070?°C/160?MPa: (a) g?=?022, (b) g?=?002, (c) g ?=?020, (d) g=0 2 ? 2.
Fig. 7. Schematic diagrams of dislocations slipping and decomposing on different planes of γ′ phase in the alloy during creep: (a) decomposition of dislocation on (11 1 ? ) plane to form SISF, (b) slipping and decomposing of dislocation on (11 1 ? ) plane, and (c) cross-slipping of dislocations from {111} to {100} planes to form K-W locks.
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