Researching | Surface Laser Polishing of High-Entropy CoCrFeNi Alloy Prepared by Laser Additive Manufacturing

Chinese Journal of Lasers, Volume. 50, Issue 20, 2002304(2023)

Surface Laser Polishing of High-Entropy CoCrFeNi Alloy Prepared by Laser Additive Manufacturing

Yuhang Zhou^1,2,3, Mina Zhang^2、*, Xiaoxiao Chen^2、**, Qunli Zhang^1,3, and Wenwu Zhang²

Author Affiliations

¹College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, Zhejiang, China

²Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences; Zhejiang Provincial Key Laboratory of Aero Engine Extreme Manufacturing Technology, Ningbo 315201, Zhejiang, China

³Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310023, Zhejiang, China

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Figures&Tables (20)

References (28)

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Figures & Tables(20)

Fig. 1. Morphology and particle size distribution of CoCrFeNi high-entropy alloy powder. (a) SEM image; (b) profile of high-entropy alloy powder particle; (c) particle size distribution

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Fig. 2. Laser additive manufacturing and continuous-wave (CW) laser polishing. (a) Laser additive manufacturing system; (b) schematic diagram of laser additive manufacturing process; (c) continuous-wave laser-polishing system; (d) schematic diagram of continuous-wave laser-polishing process

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Fig. 3. Scanning strategies. (a) Uni-directional scanning; (b) orthogonal scanning

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Fig. 4. Pareto diagram of screening test of CoCrFeNi high-entropy alloy in continuous-wave laser polishing

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Fig. 5. Defocus schematic

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Fig. 6. Influence of defocus on surface roughness of CoCrFeNi high-entropy alloy additive samples

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Fig. 7. Three-dimensional morphologies of laser-polished surface at different defocuses. (a) 0 mm; (b) 2 mm; (c) 4 mm; (d) 6 mm

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Fig. 8. Variation of surface roughness with laser power and scanning speed. (a) Variation of surface roughness with laser power; (b) variation of surface roughness with scanning speed

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Fig. 9. Three-dimensional topography at different laser powers

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Fig. 10. Three-dimensional topography at different scanning speeds

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Fig. 11. Influence of the number of scanning on surface roughness of CoCrFeNi high-entropy alloy additive samples

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Fig. 12. Three-dimensional topography at different numbers of scanning. (a) n=4; (b) n=6; (c) n=8; (d) n=10

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$Surface morphology and X-ray diffraction patterns of the samples. (a) Initial surface of the sample; (b) X-ray diffraction patterns of the sample before and after polishing$

Fig. 13. Surface morphology and X-ray diffraction patterns of the samples. (a) Initial surface of the sample; (b) X-ray diffraction patterns of the sample before and after polishing

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Fig. 14. Distribution of each element on the sample surface

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Fig. 15. Schematic diagrams of oxide layer formation and removal on sample surface. (a) Schematic diagram of oxide layer formation; (b) schematic diagram of oxide layer removal

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Table 1. Content of each element in CoCrFeNi high-entropy alloy powder
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Table 1. Content of each element in CoCrFeNi high-entropy alloy powder
Element Atomic fraction /%
Cr 26.12
Fe 24.63
Co 24.59
Ni 24.65

Table 2. Experimental factors and levels

Table 2. Experimental factors and levels

Factor	Level
Factor	1	2
Laser power P_L /W	150	300
Scanning speed V /（ $m m \cdot s^{- 1}$ ）	300	1000
Scanning pitch d /μm	5	150
Defocus z /mm	0	10
The number of scanning n	2	8
Scanning strategy S_p	Uni-directional scanning	Orthogonal scanning

Table 3. Screening test results
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Table 3. Screening test results
Number Surface roughness R_a /μm Standard error /μm
1 12.95 1.30
2 13.76 0.72
3 15.99 1.38
4 15.43 0.62
5 5.29 0.42
6 12.54 1.10
7 4.51 0.35
8 16.15 0.76
9 9.88 0.65
10 19.48 0.54
11 9.00 0.63
12 11.42 1.16
13 20.20 1.06
14 10.92 0.57

Table 4. Variance analysis of CoCrFeNi high-entropy alloy

Table 4. Variance analysis of CoCrFeNi high-entropy alloy

Item	Degree of freedom	Adj SS	Adj MS	F value	P value
Model	9	278.76	30.9733	36.51	0.002
Linear	6	124.492	20.7487	24.46	0.004
P_L	1	10.873	10.8727	12.82	0.023
V	1	3.3	3.3001	3.89	0.12
d	1	7.717	7.7165	9.1	0.039
z	1	97.68	97.6799	115.15	0
S_p	1	1.667	1.6669	1.97	0.234
n	1	0.081	0.0807	0.1	0.773
2-factor interaction	3	154.267	51.4225	60.62	0.001
P_L∙z	1	87.873	87.8727	103.59	0.001
P_L∙n	1	63.021	63.0206	74.29	0.001
V∙d	1	10.392	10.3918	12.25	0.025
Error	4	3.393	0.8483
Summation	13	282.153

Table 5. Experimental process parameters
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Table 5. Experimental process parameters
Number
Laser power
P_L /W
Scanning speed
V / $(m m \cdot s^{- 1})$
The number of scanning n
Scanning pitch
d /mm
Defocus
z /mm
1 400 300 6 0.05 0
2 2
3 4
4 6

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Yuhang Zhou, Mina Zhang, Xiaoxiao Chen, Qunli Zhang, Wenwu Zhang. Surface Laser Polishing of High-Entropy CoCrFeNi Alloy Prepared by Laser Additive Manufacturing[J]. Chinese Journal of Lasers, 2023, 50(20): 2002304

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Paper Information

Category: Laser Additive Manufacturing

Received: Mar. 14, 2023

Accepted: May. 15, 2023

Published Online: Sep. 20, 2023

The Author Email: Zhang Mina (zhangmina@nimte.ac.cn), Chen Xiaoxiao (chenxiaoxiao@nimte.ac.cn)

DOI:10.3788/CJL230616

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology