Selective Laser Melting Technology Applied into Aircraft Air Inlet Protective Grilling

$SEM images of specimen fractures. (a) Longitudinal as-printed sample; (b) transverse as-printed sample;（c）longitudinal as-annealed sample；（d）transverse as-annealed sample$

Fig. 6. SEM images of specimen fractures. (a) Longitudinal as-printed sample; (b) transverse as-printed sample;（c）longitudinal as-annealed sample；（d）transverse as-annealed sample

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Fig. 7. Practical picture of SLM formed protective grilling

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Table 1. Chemical composition of TC4 alloy powder
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Table 1. Chemical composition of TC4 alloy powder
Element Ti Al V Fe C O N H
Mass fraction /% ‒ 6.04 4.02 0.025 0.01 0.086 0.007 0.0026

Table 2. SLM forming parameters of titanium alloy
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Table 2. SLM forming parameters of titanium alloy
Parameter Power /W Dot spacing /μm Time of exposure /μs Trace interval /μm Layer thickness /μm
Value 170 75 60 65 30

Table 3. Tensile properties at room temperature of TC4 in different states

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Table 3. Tensile properties at room temperature of TC4 in different states

Sample	Tensile strength R_m /MPa	Yield strength R_p0.2 /MPa	Elongation A /%	Reduction of area Z /%	Impact toughness a_ku /（J·cm^-2）
Forge piece（HB 5432—1989）	≥895	≥825	≥10	≥30	≥35
Transverse as-printed sample	1220	1087	12.0	30	37.85
Longitudinal as-printed sample	1201	1124	12.9	41	40.67
Transverse as-annealed sample	1034	936	16.9	45	43.67
Longitudinal as-annealed sample	1048	969	19.0	53	61.67

Table 4. Tensile properties at high temperature of TC4 in different states

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Table 4. Tensile properties at high temperature of TC4 in different states

Sample	R_m / MPa	R_p0.2 / MPa	A / %	Z / %
Forge piece（HB 5432—1989）	≥600	‒	≥12	≥40
Transverse as-printed sample	885	722	10.5	45
Longitudinal as-printed sample	889	734	11.8	50
Transverse as-annealed sample	714	589	13.9	59
Longitudinal as-annealed sample	736	611	14.0	66

Table 5. Measured dimensions of the grille's unit grids prepared via SLM process

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Table 5. Measured dimensions of the grille's unit grids prepared via SLM process

No. of grids	Measured dimension /mm
No. of grids	Edge 1	Edge 2	Edge 3	Edge 4	Maximum	Minimum	Average
1#	2.46	2.51	2.48	2.50	2.51	2.46	2.49
2#	2.47	2.48	2.47	2.45	2.48	2.45	2.47
3#	2.44	2.46	2.45	2.48	2.48	2.44	2.46
4#	2.49	2.48	2.45	2.47	2.49	2.45	2.47
5#	2.43	2.47	2.46	2.44	2.47	2.43	2.45

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Xiaoye Cai, Jiaqi Hu, Zonghui Cheng, Jie Zhang. Selective Laser Melting Technology Applied into Aircraft Air Inlet Protective Grilling[J]. Laser & Optoelectronics Progress, 2021, 58(17): 1714007

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