J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (8): 1607-1617.DOI: 10.1016/j.jmst.2019.03.023
• Orginal Article • Previous Articles Next Articles
Xumin Zhua, Congyang Gongab, Yun-Fei Jiaa*(), Runzi Wanga, Chengcheng Zhangb, Yao Fua, Shan-Tung Tua, Xian-Cheng Zhangab*()
Received:
2018-12-30
Revised:
2019-01-30
Accepted:
2019-03-05
Online:
2019-08-05
Published:
2019-06-19
Contact:
Jia Yun-Fei,Zhang Xian-Cheng
About author:
1 These authors contributed equally to this work.
Xumin Zhu, Congyang Gong, Yun-Fei Jia, Runzi Wang, Chengcheng Zhang, Yao Fu, Shan-Tung Tu, Xian-Cheng Zhang. Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650 °C[J]. J. Mater. Sci. Technol., 2019, 35(8): 1607-1617.
Ni | Cr | Mo | Al | Ti | Nb | Mn | Si | C | Fe |
---|---|---|---|---|---|---|---|---|---|
53.02 | 19.05 | 3.00 | 0.50 | 0.93 | 5.11 | 0.03 | 0.10 | 0.033 | Bal. |
Table 1 Chemical compositions of GH4169 alloy (wt%).
Ni | Cr | Mo | Al | Ti | Nb | Mn | Si | C | Fe |
---|---|---|---|---|---|---|---|---|---|
53.02 | 19.05 | 3.00 | 0.50 | 0.93 | 5.11 | 0.03 | 0.10 | 0.033 | Bal. |
HT1 | 960 °C for 1 h, AC to 720 °C |
---|---|
HT2 | 1050 °C for 1 h, AC to 720 °C |
HT3 | 1090 °C for 1 h, AC to 960 °C, 960 °C for 1 h, AC to 720 °C |
Table 2 Processing parameters used in HTs (AC denotes air cooling).
HT1 | 960 °C for 1 h, AC to 720 °C |
---|---|
HT2 | 1050 °C for 1 h, AC to 720 °C |
HT3 | 1090 °C for 1 h, AC to 960 °C, 960 °C for 1 h, AC to 720 °C |
HT | dr (μm) | da (μm) | σuts (MPa) | σy (MPa) | e (%) |
---|---|---|---|---|---|
HT1 | 5-21 | 12 | 1189.1 | 1024.4 | 10.56 |
HT2 | 29-82 | 48 | 989.5 | 833.8 | 26.88 |
HT3 | 31-208 | 83 | 974.2 | 810.6 | 32.40 |
Table 3 Grain size and tensile properties of GH4169 alloys after different HTs.
HT | dr (μm) | da (μm) | σuts (MPa) | σy (MPa) | e (%) |
---|---|---|---|---|---|
HT1 | 5-21 | 12 | 1189.1 | 1024.4 | 10.56 |
HT2 | 29-82 | 48 | 989.5 | 833.8 | 26.88 |
HT3 | 31-208 | 83 | 974.2 | 810.6 | 32.40 |
Specimen | HT condition | n | Nf (cycle) | N0 (cycles) | N0 -Nf (cycle) | Test condition |
---|---|---|---|---|---|---|
1 | HT1 | 1 | 19973 | 8000 | 11973 | Replica |
2 | HT2 | 6 | 5979 | 800 | 5179 | Replica |
3 | HT3 | 4 | 5705 | 400 | 5305 | Replica |
4 | HT1 | 21195 | No-replica | |||
5 | HT2 | 5838 | No-replica | |||
6 | HT3 | 5531 | No-replica |
Table 4 Fatigue lives and crack initiation lives of SENT specimens.
Specimen | HT condition | n | Nf (cycle) | N0 (cycles) | N0 -Nf (cycle) | Test condition |
---|---|---|---|---|---|---|
1 | HT1 | 1 | 19973 | 8000 | 11973 | Replica |
2 | HT2 | 6 | 5979 | 800 | 5179 | Replica |
3 | HT3 | 4 | 5705 | 400 | 5305 | Replica |
4 | HT1 | 21195 | No-replica | |||
5 | HT2 | 5838 | No-replica | |||
6 | HT3 | 5531 | No-replica |
Fig. 4. Images from replicas after (a) 13900, (b) 14500, (c) 16000, (d) 18,400 and (e) 19,100 cycles showing initiation and growth process of main crack at surface of SENT specimen HT1 with average grain size of 12 μm.
Fig. 5. Images from replicas after (a) 2200, (b) 3100, (c) 3600 and (d) 4600 cycles showing initiation and growth process of main cracks at surface of SENT specimen HT2 with average grain size of 48 μm.
Fig. 6. Initiation sites of three main cracks at surface of SENT specimen HT3 with average grain size of 83 μm after 1600 cycles: (a) crack 1; (b) cracks 2 and 3.
Fig. 14. Crack 6 at surface of HT2 specimen: (a) intergranular cracking caused by impingement of slip bands upon grain boundary; (b) fracture morphology near region A; (c) fracture morphologies near region B.
Fig. 16. Variation of crack growth rates along with length of (a) crack 2 and (b) crack 4 at surface of specimen HT2, where the blocking effects of grain boundaries and twins on the deceleration of small crack growth can be found.
Fig. 17. Crack growth rate as a function of stress intensity factor range ΔK for specimens HT1, HT2 and HT3, where the data of long crack [32] is included for comparison.
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