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Study on overlap rate and machinability of selected laser melting of maraging steel

Zeyu Yang
Zeyu Yang
, 
Weimin Li
Weimin Li
, 
Shufen Liu
Shufen Liu
 et 
Qi Gao
Qi Gao
   | 27 nov. 2023
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Publié en ligne: 27 nov. 2023
Pages: 368 - 382
Reçu: 13 sept. 2023
Accepté: 21 oct. 2023
DOI: https://doi.org/10.2478/msp-2023-0028
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© 2023 Zeyu Yang et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

18Ni300 powder microstructure
18Ni300 powder microstructure

Fig. 2.

Experimental implementation plan: (a) experiment design path scheme; (b) additive material manufacturing work platform
Experimental implementation plan: (a) experiment design path scheme; (b) additive material manufacturing work platform

Fig. 3.

A sketch of the effect of different overlap rates on the cross-section morphology of the cladding layer: (a) morphology of the cladding layer with too low an overlap rate; (b) morphology of the cladding layer with a moderate overlap rate; (c) morphology of the cladding layer with too high an overlap rate; (d) schematic diagram of the calculation of the overlap rate of the cladding layer
A sketch of the effect of different overlap rates on the cross-section morphology of the cladding layer: (a) morphology of the cladding layer with too low an overlap rate; (b) morphology of the cladding layer with a moderate overlap rate; (c) morphology of the cladding layer with too high an overlap rate; (d) schematic diagram of the calculation of the overlap rate of the cladding layer

Fig. 4.

Cutting test system
Cutting test system

Fig. 5.

Macroscopical morphology and three-dimensional real surface morphology of the cladding layer with different overlap rate
Macroscopical morphology and three-dimensional real surface morphology of the cladding layer with different overlap rate

Fig. 6.

Cross-section topography of cladding layer with different overlap rate
Cross-section topography of cladding layer with different overlap rate

Fig. 7.

Metallographic structure of cladding layer at different positions under different overlap rates: (1) overlap rate 40%; (2) overlap rate 50%; (3) overlap rate 60%
Metallographic structure of cladding layer at different positions under different overlap rates: (1) overlap rate 40%; (2) overlap rate 50%; (3) overlap rate 60%

Fig. 8.

The scanning result of the metallurgical bonding zone at the bottom of the cladding layer under conditions of different overlap rates
The scanning result of the metallurgical bonding zone at the bottom of the cladding layer under conditions of different overlap rates

Fig. 9.

The top microstructure of the cladding layer under different overlap rates: the overlap rate of a and a1 is 40%; that of b and b1 is 50%; and that of c and c1 is 60%
The top microstructure of the cladding layer under different overlap rates: the overlap rate of a and a1 is 40%; that of b and b1 is 50%; and that of c and c1 is 60%

Fig. 10.

SEM-EDS map of the lap joint of the cladding layer under differing overlap rates
SEM-EDS map of the lap joint of the cladding layer under differing overlap rates

Fig. 11.

Microhardness of the cladding layer under different overlap rates
Microhardness of the cladding layer under different overlap rates

Fig. 12.

Surface profile of cladding layer with 50% overlap after milling: (a) crater defects on the milled surface; (b) milled surface; (c) crack defects on the milled surface
Surface profile of cladding layer with 50% overlap after milling: (a) crater defects on the milled surface; (b) milled surface; (c) crack defects on the milled surface

Fig. 13.

Surface morphology of cladding layer after milling with 50% overlap rate: (a) surface after milling under a metallographic microscope; (b) the true surface morphology; (c) macroscopic surface after milling
Surface morphology of cladding layer after milling with 50% overlap rate: (a) surface after milling under a metallographic microscope; (b) the true surface morphology; (c) macroscopic surface after milling

Fig. 14.

SEM appearance of the milling surface of the cladding layer with 50% overlap: (a) down milling side burr topography, (b) reverse milling side burr appearance, (c) milling surface topography, and (d) milling surface defects
SEM appearance of the milling surface of the cladding layer with 50% overlap: (a) down milling side burr topography, (b) reverse milling side burr appearance, (c) milling surface topography, and (d) milling surface defects

Experimental process parameters of additive manufacturing

Laser power W Scan speed mm/s Speed of power feeding g/min
1300 2 10

Elemental composition of 18Ni300 powder

NI Co Mo TI AI Cr P Mn Si C S
18.3 8.9 4.7 0.7 0.2 0.1 0.05 0.02 0.03 0.05 0.03

The content of each element in 40%, 50%, and 60% EDS mapping

Overlap rate Fe Ni Co Mo C
40% 62.52 16.28 8.76 4.65 7.8
50% 62.72 16.45 8.90 4.45 7.48
60% 61.20 16.23 8.30 4.26 10.01

Experimental process parameters

Spindle speed (r/min) Feed rate (mm/z) Depth of cut (mm)
12000 0.004 0.65
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