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

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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Table 1. Chemical composition of base metal
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Table 1. Chemical composition of base metal
Element Mass fraction /%
Cr 16.82
Ni 9.84
Mo 1.78
Mn 1.52
Si 0.5
Fe Bal.

Table 2. Laser cutting parameters
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Table 2. Laser cutting parameters
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 3. Phase parameters in electron back scattering diffraction (EBSD) tests
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Table 3. Phase parameters in electron back scattering diffraction (EBSD) tests
Phase Structure Space group Lattice parameter
δ Cubic 229：I m 3 m
a=b=c=0.287 nm
α=β=γ=90°
γ Cubic 225：F m 3 m
a=b=c=0.365 nm
α=β=γ=90°

Table 4. Main results derived from EBSD postprocessing
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Table 4. Main results derived from EBSD postprocessing
Type Name Parameter
Kikuchi line Phase map Crystalline lattice
Crystal orientation Pole figure Plane texture：｛hkl｝
Inverse pole figure Orientation parallel to a specific direction

Table 5. Composition variation of recast layer along thickness direction
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Table 5. Composition variation of recast layer along thickness direction
Site Mass fraction /%
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 6. Spatial coordinates of pole points in pole figures shown in Fig. 5

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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	（-0.20，0.67，0.72）	（-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 7. Spatial coordinates of pole points in pole figures shown in Fig. 7

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

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）

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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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