Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (1): 133-145.DOI: 10.1007/s40195-021-01273-7
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Keli Liu1, Junsheng Wang1,2(), Bing Wang1, Pengcheng Mao3, Yanhong Yang4, Yizhou Zhou4
Received:
2021-02-09
Revised:
2021-05-13
Accepted:
2021-05-14
Online:
2022-01-10
Published:
2021-07-16
Contact:
Junsheng Wang
About author:
Junsheng Wang, junsheng.wang@bit.edu.cnKeli Liu, Junsheng Wang, Bing Wang, Pengcheng Mao, Yanhong Yang, Yizhou Zhou. Quantifying the Influences of Carbides and Porosities on the Fatigue Crack Evolution of a Ni-Based Single-Crystal Superalloy using X-ray Tomography[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(1): 133-145.
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C | Al | Co | Cr | Mo | Re | Ta | W | Ni |
---|---|---|---|---|---|---|---|---|
0.10 | 6.12 | 7.73 | 7.01 | 1.51 | 2.99 | 6.49 | 4.91 | Bal. |
Table 1 Nominal compositions of the modified DD5 superalloy
C | Al | Co | Cr | Mo | Re | Ta | W | Ni |
---|---|---|---|---|---|---|---|---|
0.10 | 6.12 | 7.73 | 7.01 | 1.51 | 2.99 | 6.49 | 4.91 | Bal. |
Fig. 3 Segmentation process of carbides by using deep learning network: a the raw 2D transverse slices; b adjusting the brightness and contrast of the slices; c extracting the carbides by the trained conventional neural network; d 3D reconstruction of the extracted carbides
Fig. 4 a Blocky carbides and script carbides from SEM characterization; b carbides from the XCT acquisition dataset; EDS analyses of the blocky carbide c and script carbide d
C | Al | Co | Cr | Mo | Hf | Ta | W | Ni | |
---|---|---|---|---|---|---|---|---|---|
Blocky carbide | 52.39 | - | 0.72 | 0.79 | 1.21 | 3.73 | 34.59 | 1.05 | 5.10 |
Script carbide | 20.76 | 11.58 | 6.02 | 6.19 | 0.84 | - | 1.67 | 1.18 | 51.83 |
Table 2 Chemical composition of the blocky and script carbides (at.%)
C | Al | Co | Cr | Mo | Hf | Ta | W | Ni | |
---|---|---|---|---|---|---|---|---|---|
Blocky carbide | 52.39 | - | 0.72 | 0.79 | 1.21 | 3.73 | 34.59 | 1.05 | 5.10 |
Script carbide | 20.76 | 11.58 | 6.02 | 6.19 | 0.84 | - | 1.67 | 1.18 | 51.83 |
Fig. 6 Crack initiation process near the carbides: a-d 2D transverse slices and e-h 2D vertical slices of the crack initiation site; i-l 3D volume rendering of the carbides and pores
Fig. 7 Microcracks close to carbides in the bulk region of the specimen: a 2D transverse slices in the middle section at the 9400 cycles, b, c the magnified images of the cracks near the carbides in a
Fig. 8 Clustering pores in crack initiation zone: a, b 2D transverse slices and c, d 2D vertical slices; e, f 3D volume rendering of the clustering pores induced cracks at as-cast and 9400 cycles state
Fig. 9 Quantitatively analysis of the relationship between fatigue loading cycles and pore number density, averaged pore equivalent diameter and averaged pore sphericity
Fig. 10 SEM observation of a overall fracture surface, b carbide-induced crack initiation zone, c crack propagation path, d pore-induced crack initiation zone in the sample
Fig. 11 a 3D rendering of the final fracture surface. The as-cast pores (red objects) mapped to the b crack propagation zone and c crack initiation zone
Fig. 14 Comparing fracture surface roughness of the carbide-induced crack initiation zone, pore-induced crack initiation zone, carbide-affected crack propagation zone and pore-affected crack propagation zone
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