Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (5): 651-658.DOI: 10.1007/s40195-018-0827-0
Special Issue: 2018-2019高温合金专辑
• Orginal Article • Previous Articles Next Articles
Xiang-Wei Li1,2, Li Wang1, Xin-Gang Liu1, Yao Wang1, Jia-Sheng Dong1(), Lang-Hong Lou1
Received:
2018-06-21
Revised:
2018-07-31
Online:
2019-05-10
Published:
2019-05-27
Xiang-Wei Li, Li Wang, Xin-Gang Liu, Yao Wang, Jia-Sheng Dong, Lang-Hong Lou. Effect of Aging Heat Treatment on the Microstructure and Creep Properties of the Cast Ni-Based Superalloy at Low Temperature[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(5): 651-658.
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Solution and first aging heat treatment | Second aging heat treatment | |
---|---|---|
AHT-1 | 1235 °C/3 h, AC 1080 °C/4 h, AC | None |
AHT-2 | 750 °C/16 h, AC | |
AHT-3 | 850 °C/16 h, AC | |
AHT-4 | 1000 °C/16 h, AC |
Table 1 Heat treatment conditions of test bars in the present experiment
Solution and first aging heat treatment | Second aging heat treatment | |
---|---|---|
AHT-1 | 1235 °C/3 h, AC 1080 °C/4 h, AC | None |
AHT-2 | 750 °C/16 h, AC | |
AHT-3 | 850 °C/16 h, AC | |
AHT-4 | 1000 °C/16 h, AC |
Fig. 1 Morphologies of GB microstructures in the a-c as-cast and d heat-treated samples: a, d SEM images of M23C6 carbides, b STEM images and selected area diffraction pattern of M23C6 carbides, c composition of M23C6 carbides measured by EDS
AHT-2 | AHT-3 | AHT-4 | |
---|---|---|---|
Average size (μm) | 0.17 ± 0.06 | 0.36 ± 0.05 | 0.70 ± 0.11 |
Table 2 Average size of M23C6 carbides in the samples with different heat treatment histories
AHT-2 | AHT-3 | AHT-4 | |
---|---|---|---|
Average size (μm) | 0.17 ± 0.06 | 0.36 ± 0.05 | 0.70 ± 0.11 |
Heat treatments | Average lifetime (h) | Elongation (%) |
---|---|---|
AHT-1 | < 1 | 1.8 ± 1.3 |
AHT-2 | 8 ± 4 | 2.6 ± 0.2 |
AHT-3 | 40 ± 9 | 3.2 ± 1.0 |
AHT-4 | 117 ± 37 | 4.2 ± 0.9 |
Table 3 Average stress-rupture lifetime of specimens aged at different heat treatments
Heat treatments | Average lifetime (h) | Elongation (%) |
---|---|---|
AHT-1 | < 1 | 1.8 ± 1.3 |
AHT-2 | 8 ± 4 | 2.6 ± 0.2 |
AHT-3 | 40 ± 9 | 3.2 ± 1.0 |
AHT-4 | 117 ± 37 | 4.2 ± 0.9 |
Fig. 7 Relationship among minimum creep rate, creep strain and the time to onset of tertiary creep (tt) for the specimens with different heat treatments
Fig. 8 Relationship between the time to fracture (tf) and the time to onset of tertiary creep (tt) in the specimens with different heat treatments (the dash line is the fitting line of tf/tt = 1.5)
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