J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (9): 1917-1924.DOI: 10.1016/j.jmst.2019.05.026
• Orginal Article • Previous Articles Next Articles
Liu Liuab, Jie Menga*(), Jinlai Liua, Mingke Zoua, Haifeng Zhangc, Xudong Sunb, Yizhou Zhoua
Received:
2019-03-01
Revised:
2019-04-01
Accepted:
2019-04-30
Online:
2019-09-20
Published:
2019-07-26
Contact:
Meng Jie
About author:
1 These authors contributed equally to this work.
Liu Liu, Jie Meng, Jinlai Liu, Mingke Zou, Haifeng Zhang, Xudong Sun, Yizhou Zhou. Influences of Re on low-cycle fatigue behaviors of single crystal superalloys at intermediate temperature[J]. J. Mater. Sci. Technol., 2019, 35(9): 1917-1924.
Specimen | C | Cr | Mo | Co | W | Ta | Al | Hf | Re | Ni |
---|---|---|---|---|---|---|---|---|---|---|
Alloy 0Re | 0.07 | 7 | 1.5 | 7.8 | 5 | 6.6 | 6 | 0.15 | 0 | Bal. |
Alloy 1.5Re | 0.07 | 7 | 1.5 | 7.8 | 5 | 6.6 | 6 | 0.15 | 1.5 | Bal. |
Alloy 3Re | 0.07 | 7 | 1.5 | 7.8 | 5 | 6.6 | 6 | 0.15 | 3.0 | Bal. |
Table 1 Nominal composition of experimental alloys (wt%).
Specimen | C | Cr | Mo | Co | W | Ta | Al | Hf | Re | Ni |
---|---|---|---|---|---|---|---|---|---|---|
Alloy 0Re | 0.07 | 7 | 1.5 | 7.8 | 5 | 6.6 | 6 | 0.15 | 0 | Bal. |
Alloy 1.5Re | 0.07 | 7 | 1.5 | 7.8 | 5 | 6.6 | 6 | 0.15 | 1.5 | Bal. |
Alloy 3Re | 0.07 | 7 | 1.5 | 7.8 | 5 | 6.6 | 6 | 0.15 | 3.0 | Bal. |
Fig. 1. Microstructures of experimental superalloys containing different Re contents after standard heat treatment: (a) Alloy 0Re; (b) Alloy 1.5Re; (c) Alloy 3Re.
Fig. 3. Surface morphologies of Alloy 0Re after LCF failure at 760 °C: (a) fracture surface; (b) crack initiation (high-magnification of the yellow box indicated in (a)); (c) slip bands on surface; (d) oxidation (high-magnification of (c)).
Fig. 4. Surface morphologies of Alloy 1.5Re after LCF failure at 760 °C: (a) fracture surface; (b) crack initiation on surface (high-magnification of the yellow box indicated in (a)); (c, d) internal crack initiation (high-magnification of blue and purple boxes indicated in (a)); (e) slip bands on surface; (f) slip bands cutting γ′ phases.
Fig. 5. Surface morphologies of Alloy 3Re after LCF failure at 760 °C: (a) fracture surface; (b) crack initiation (high-magnification of the yellow boxes indicated in (a)); (c) slip bands parallel to surface; (d) slip bands at junction.
Fig. 6. TEM bright-field micrographs showing dislocation configurations of Alloy 0Re after fatigue failure at 760 °C: (a) slip bands; (b) dislocations in γ′ phases; (c) fault loops; (d) schematic illustration of formation of fault loops.
Fig. 7. TEM bright-field micrographs showing dislocation configurations of Alloy 1.5Re after fatigue failure at 760 °C: (a, b) slip bands; (c) dislocations in γ′ phases; (d) dislocations slipping in γ channels; (e) stacking faults; (f) dislocation cross-slip.
Fig. 8. TEM bright-field micrographs showing dislocation configurations of Alloy 3Re after fatigue failure at 760 °C: (a) dislocations in γ channels; (b) dislocations in γ′ phases; (c) stacking faults in γ′ phases; (d) continuous stacking faults extending through γ and γ′ phases.
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