Microstructure of Recast Layer During High Power Laser Cutting of Thick Plates

Xiuquan Ma; Libo Wang; Zhengwu Zhu; Chunming Wang; Gaoyang Mi

doi:10.3788/CJL220611

Journals >Chinese Journal of Lasers >Volume 50 >Issue 4 >Page 0402015 > Article

Chinese Journal of Lasers
Vol. 50, Issue 4, 0402015 (2023)

Microstructure of Recast Layer During High Power Laser Cutting of Thick Plates

Xiuquan Ma¹, Libo Wang¹, Zhengwu Zhu^1、*, Chunming Wang², and Gaoyang Mi²

Author Affiliations

¹School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei , China

²School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei , China

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DOI: 10.3788/CJL220611 Cite this Article Set citation alerts

Xiuquan Ma, Libo Wang, Zhengwu Zhu, Chunming Wang, Gaoyang Mi. Microstructure of Recast Layer During High Power Laser Cutting of Thick Plates[J]. Chinese Journal of Lasers, 2023, 50(4): 0402015 Copy Citation Text

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Fig. 1. Schematics for laser cutting. (a) Front view; (b) top view

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Fig. 2. Sampling, preparation and characterization of microstructure in the kerf

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Fig. 3. Morphology of recast layer at different sites. (a)-(b) Kerf top; (c)-(e) at 1/3 site from kerf top; (f)-(g) at 2/3 site from kerf top; (h)-(j) kerf bottom

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Fig. 4. Grain growth mode of recast layer. (a) At 1/3 site from kerf top; (b) kerf bottom

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Fig. 5. Crystal orientation of recast layer at 1/3 site from kerf top. (a) Phase map; (b) IPF orientation figure derived from TD; (c) {1 0 0} pole figures of δ and γ phases in resolidified zone (RZ) and base material (BM)

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Fig. 6. Grain size at 1/3 site from kerf top. (a) Grain size map; (b) grain size profiles of δ and γ phases in BM; (c) grain size profiles of δ and γ phases in RZ

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Fig. 7. Crystal orientation at kerf bottom. (a) Phase map; (b) IPF orientation figure derived from TD; (c) {1 0 0} pole figures of δ and γ phases in RZ and BM

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Fig. 8. Grain size at kerf bottom. (a) Grain size map; (b) grain size profiles of δ and γ phases in BM; (c) grain size profiles of δ and γ phases in RZ

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Fig. 9. IPF orientation figures derived from TD with pole figures of BM and RZ at 1/3 site from kerf top. (a) δ phase; (b) γ phase

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Fig. 10. IPF orientation figures derived from TD with pole figures of BM and RZ at kerf bottom. (a) δ phase; (b) γ phase

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Element	Mass fraction /%
Cr	16.82
Ni	9.84
Mo	1.78
Mn	1.52
Si	0.5
Fe	Bal.

Table 1. Chemical composition of base metal

Parameter	Value
N₂ pressure /MPa	9.8
Laser power /kW	9
Pulse frequency /Hz	300
Duty cycle /%	60
Defocus /mm	-15
Cutting speed /（mm·min^-1）	350

Table 2. Laser cutting parameters

Phase

Structure

Space group

Lattice parameter

Cubic

229：I m 3 m

a=b=c=0.287 nm

α=β=γ=90°

Cubic

225：F m 3 m

a=b=c=0.365 nm

α=β=γ=90°

Table 3. Phase parameters in electron back scattering diffraction (EBSD) tests

Type	Name	Parameter
Kikuchi line	Phase map	Crystalline lattice
Crystal orientation	Pole figure	Plane texture：｛hkl｝
Crystal orientation	Inverse pole figure	Orientation parallel to a specific direction

Table 4. Main results derived from EBSD postprocessing

Site	Mass fraction /%
Site	Cr	Ni	Mo	Mn	Si	Fe
Kerf top	17.17	10.91	2.36	0.76	1.05	67.75
1/3 from kerf top	17.08	9.65	2.12	0.63	0.90	69.62
2/3 from kerf top	17.51	10.04	1.62	1.00	0.83	69.00
Kerf bottom	17.63	9.06	2.81	1.02	0.99	68.49

Table 5. Composition variation of recast layer along thickness direction

No.	Spatial coordinate
No.	δ-RZ	γ-RZ	δ-BM	γ-BM
1	（-0.20，0.67，0.72）	（-0.81，0.22，0.54）	（-0.21，0.65，0.73）	（-0.77，0.26，0.58）
2	（-0.61，0.38，0.69）	（0.65，0.11，0.76）	（0.99，0.04，0.12）	（0.64，0.10，0.77）
3	（0.94，-0.09，0.31）	（-0.09，-0.97，0.23）	（0.92，0.10，0.37）	（-0.17，-0.96，0.26）
4	（0.63，-0.29，0.72）		（0.04，-0.93，0.36）
5	（-0.25，-0.76，0.61）
6	（-0.46，-0.89，0.07）

Table 6. Spatial coordinates of pole points in pole figures shown in Fig. 5

No.	Spatial coordinate
No.	δ-RZ	γ-RZ	δ-BM	γ-BM
1	（-0.05，0.52，0.86）	（-0.39，0.85，0.36）	（-0.18，0.20，0.96）	（0.75，0.28，0.60）
2	（0.69，0.34，0.64）	（-0.07，0.86，0.50）	（0.87，0.13，0.47）	（0.37，0.25，0.89）
3	（-0.44，0.21，0.87）	（0.77，0.27，0.59）	（0，-0.68，0.73）	（-0.12，-0.76，0.64）
4	（0.91，0.11，0.40）	（-0.30，0.09，0.95）	（-0.06，-0.86，0.51）
5	（0.05，-0.59，0.81）	（0.94，0.07，0.33）
6	（0.08，-0.77，0.63）	（0.11，0，0.99）
7		（-0.04，-0.20，0.98）
8		（-0.82，-0.37，0.42）
9		（0.18，-0.87，0.44）

Table 7. Spatial coordinates of pole points in pole figures shown in Fig. 7

Xiuquan Ma, Libo Wang, Zhengwu Zhu, Chunming Wang, Gaoyang Mi. Microstructure of Recast Layer During High Power Laser Cutting of Thick Plates[J]. Chinese Journal of Lasers, 2023, 50(4): 0402015

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