Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (10): 1607-1616.DOI: 10.1007/s40195-022-01393-8
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Zishu Chai1, Kexuan Zhou1, Qingfeng Wu1, Zhijun Wang1(), Quan Xu2, Junjie Li1, Jincheng Wang1
Received:
2021-11-09
Revised:
2022-01-05
Accepted:
2022-01-07
Online:
2022-03-23
Published:
2022-03-23
Contact:
Zhijun Wang
About author:
Zhijun Wang, zhjwang@nwpu.edu.cnZishu Chai, Kexuan Zhou, Qingfeng Wu, Zhijun Wang, Quan Xu, Junjie Li, Jincheng Wang. Deformation Behaviors of an Additive-Manufactured Ni32Co30Cr10Fe10Al18 Eutectic High Entropy Alloy at Ambient and Elevated Temperatures[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(10): 1607-1616.
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Parameter | Laser power (W) | Scanning velocity (mm/s) | Elevated height (mm) | Powder feeding rate (kg/h) | Air supply rate (L/min) | Spot diameter (mm) | Overlap (%) |
---|---|---|---|---|---|---|---|
Value | 1600 | 8 | 0.2 | 2.04 | 7 | 3 | 50 |
Table 1 Processing parameters of the DLD experiment
Parameter | Laser power (W) | Scanning velocity (mm/s) | Elevated height (mm) | Powder feeding rate (kg/h) | Air supply rate (L/min) | Spot diameter (mm) | Overlap (%) |
---|---|---|---|---|---|---|---|
Value | 1600 | 8 | 0.2 | 2.04 | 7 | 3 | 50 |
Fig. 2 a Macroscopic section morphology with typical epitaxial growth features, b the enlarged phase morphology with the hypo-eutectic microstructure consisting of primary dendrites epitaxially growing across multiple deposition layers and eutectic lamellae in the inter-dendritic regions, c enlarged interlayer microstructure diagram, d XRD profiles of the DLD-ed Ni32Al18 EHEA
Regional position | Scanned area | Ni | Al | Co | Cr | Fe |
---|---|---|---|---|---|---|
Top | Map scanning | 35.55 | 17.15 | 29.69 | 8.72 | 8.89 |
FCC phase | 34.90 | 10.99 | 32.69 | 10.75 | 10.67 | |
BCC phase | 41.49 | 26.58 | 21.97 | 3.88 | 6.08 | |
Bottom | Map scanning | 32.22 | 16.49 | 31.91 | 9.09 | 10.29 |
FCC phase | 35.92 | 10.24 | 32.13 | 10.07 | 11.64 | |
BCC phase | 41.63 | 28.81 | 20.06 | 2.80 | 6.70 |
Table 2 Chemical compositions (in at.%) in the different heights and phases of the as-deposited Ni32Al18 by EDS analysis
Regional position | Scanned area | Ni | Al | Co | Cr | Fe |
---|---|---|---|---|---|---|
Top | Map scanning | 35.55 | 17.15 | 29.69 | 8.72 | 8.89 |
FCC phase | 34.90 | 10.99 | 32.69 | 10.75 | 10.67 | |
BCC phase | 41.49 | 26.58 | 21.97 | 3.88 | 6.08 | |
Bottom | Map scanning | 32.22 | 16.49 | 31.91 | 9.09 | 10.29 |
FCC phase | 35.92 | 10.24 | 32.13 | 10.07 | 11.64 | |
BCC phase | 41.63 | 28.81 | 20.06 | 2.80 | 6.70 |
Fig. 4 a Room-temperature tensile engineering strain-stress curves of the as-deposited Ni32Al18 EHEA, comparing to the as-cast counterpart, b comparison of the room-temperature tensile performance of some AM HEAs [21,27,28,29,30,31] and our work, c high-temperature tensile engineering strain-stress curves of the as-deposited Ni32Al18 alloy, d comparison of the tensile performance of the typical solid solution-strengthened Ni-based superalloys [32] and our work at 760 °C
Fig. 5 a In-situ tensile deformation curve and the schematic image of the specimen, b BSE images of microstructures of the observed area which contains characteristic regions with lamellae in different directions of the as-deposited Ni32Al18 EHEA
Fig. 6 Real-time microstructures of DLD-ed NI32Al18 EHEA at the different stain in four characteristic areas: a1-d1 in the strain of 1%; a2-d2 in the strain of 8%; a3-d3 in the strain of 16%, a4-d4 in the strain of 24%, where a, b, c and d represent region 1, 2, 3, and 4 respectively
Fig. 7 a Compression stress-strain curves at different temperatures and section structure after compression test at b 700 °C, c 850 °C, d 1000 °C and e 1150 °C; EBSD results of the samples of the as-deposited EHEA after thermal deformation at f 700 °C, g 850 °C, h 1000 °C, i 1150 °C
Fig. 8 Microstructures at different positions from the fracture representing different stages of crack initiation: a, d crake formation, b, e crake growth along the boundaries, c, f cracks have contacted each other and caused fracture failure
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