Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (12): 1699-1708.DOI: 10.1007/s40195-020-01075-3
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Mao-Kai Chen1,2, Jun Xie1(), De-Long Shu1, Gui-Chen Hou1, Shu-Ling Xun1, Jin-Jiang Yu1, Li-Rong Liu2, Xiao-Feng Sun1, Yi-Zhou Zhou1
Received:
2019-10-30
Revised:
2020-03-04
Online:
2020-12-10
Published:
2020-12-11
Contact:
Jun Xie
Mao-Kai Chen, Jun Xie, De-Long Shu, Gui-Chen Hou, Shu-Ling Xun, Jin-Jiang Yu, Li-Rong Liu, Xiao-Feng Sun, Yi-Zhou Zhou. Effect of Long-Term Thermal Exposures on Tensile Behaviors of K416B Nickel-Based Superalloy[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(12): 1699-1708.
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C | Cr | Co | Al | W | Ti | Nb | Hf | Ni |
---|---|---|---|---|---|---|---|---|
0.12 | 4.85 | 6.80 | 5.70 | 16.0 | 1.0 | 2.04 | 1.0 | Bal. |
Table 1 Chemical composition of K416B alloy (mass fraction, wt%)
C | Cr | Co | Al | W | Ti | Nb | Hf | Ni |
---|---|---|---|---|---|---|---|---|
0.12 | 4.85 | 6.80 | 5.70 | 16.0 | 1.0 | 2.04 | 1.0 | Bal. |
Fig. 1 Microstructures of as-cast K416B alloy: a dendritic and inter-dendritic structures, b carbide morphologies and EDS analysis, c γ/γ′ phase in dendrite and inter-dendrite regions
Fig. 4 SEM images of γ′ precipitates in K416B alloy in inter-dendritic region after thermal exposure for different hours at 1000°C: a 100 h, b 500 h, c 1000 h, d 1500 h
Fig. 7 Tensile properties of K416B alloy after thermal exposure for different hours at room temperature (σ0.2—yield strength, σb—tensile strength, δ—elongation)
Fig. 8 Morphologies of the regions near the fracture after the alloy thermal exposure for different hours at 1000 °C: a, b as-cast, c, d 500 h, e, f 1500 h
Fig. 9 SEM images of tensile fracture of K416B alloy at room temperature after thermal exposure for different hours at 1000 °C: a, b as-cast, c, d 500 h, e, f 1500 h
Fig. 10 SEM images of tensile fracture morphologies of K416B superalloy at room temperature after thermal exposure for different hours at 1000 °C: a, d, g the macroscopic morphologies of the as-cast alloy, the alloy was exposed for 500 h and 1000 h, respectively; b, e, h high magnified morphologies of different alloys; c, f, i back scattering images of b, e, h
Fig. 11 Schematic diagram of crack initiation and propagation near grain boundary at room temperature after thermal exposure for different hours at 1000 °C
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