Selective Laser Melting Process of Titanium Alloy Based on Single-Track Structure and Linear and Volumetric Energy Densities

Hailong Shao; Zixiong Lin; Zheng Zhang; Yichao Wang; Ming Shi; Wenxiong Lin

doi:10.3788/LOP202259.0114007

Laser & Optoelectronics Progress, Volume. 59, Issue 1, 0114007(2022)

Selective Laser Melting Process of Titanium Alloy Based on Single-Track Structure and Linear and Volumetric Energy Densities

Hailong Shao^1,2, Zixiong Lin², Zheng Zhang², Yichao Wang², Ming Shi², and Wenxiong Lin^2、*

Author Affiliations

¹College of Chemistry, Fuzhou University, Fuzhou , Fujian 350108, China

²Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou , Fujian 350002, China

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Figures & Tables(13)

Fig. 1. Micromorphology of TC4 titanium alloy powder

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Fig. 2. Morphologies of single channel with different linear energy densities when layer thickness is 30 μm. (a) η<115 J/m; (b) 115 J/m≤η≤190 J/m; (c) η>190 J/m

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Fig. 3. Relationship between molten pool width and laser power when layer thickness is 30 μm

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Fig. 4. Relationship between width and height of molten pool and linear energy density. (a) Relationship between width and linear energy density; (b) height of molten pool when η<115 J/m; (c) height of molten pool when 115 J/m≤η≤190 J/m; (d) height of molten pool when η>190 J/m

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Fig. 5. Typical surface morphologies of different samples. (a) No. 1; (b) No. 7; (c) No. 13; (d) No. 25

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Fig. 6. SEM images of different samples. (a) No. 1; (b) No. 7; (c) No. 13; (d) No. 25

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Fig. 7. Microstructure and XRD image of No. 7 sample. (a) Microstructure; (b) XRD image

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Fig. 8. Schematic of powder bed melting process

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Fig. 9. Curve of forming thickness changed with number of powder spreading

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Fig. 10. Relationship among linear energy density, surface roughness, and density

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Fig. 11. Relationship among volumetric energy density,surface roughness, and density

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Table 1. Parameters of three-factor-five-level orthogonal experiment (Initial powder thickness: 30 μm)

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Table 1. Parameters of three-factor-five-level orthogonal experiment (Initial powder thickness: 30 μm)

Sample No.	PowerP /W	Scanning speedv /（m·s^-1）	Hatch spaced /mm	Linear energy density η /（J·m^-1）	Volumetric energy density E /（J·mm^-3）
1	130	0.90	0.085	144.44	30.90
2	140	0.95	0.085	147.37	31.52
3	150	1.00	0.085	150.00	32.09
4	160	1.05	0.085	152.38	32.59
5	170	1.10	0.085	154.55	33.06
6	170	1.05	0.080	161.90	36.80
7	160	1.00	0.080	160.00	36.36
8	150	0.95	0.080	157.89	35.89
9	140	0.90	0.080	155.56	35.35
10	130	1.10	0.080	118.18	26.86
11	130	1.05	0.075	123.81	30.01
12	140	1.00	0.075	140.00	33.94
13	150	1.10	0.075	136.36	33.06
14	160	0.90	0.075	177.78	43.10
15	170	0.95	0.075	178.95	43.38
16	170	0.90	0.070	188.89	49.06
17	160	0.95	0.070	168.42	43.75
18	150	1.05	0.070	142.86	37.11
19	140	1.10	0.070	127.27	33.06
20	130	1.00	0.070	130.00	33.77
21	130	0.95	0.065	136.84	38.28
22	140	1.05	0.065	133.33	37.30
23	150	0.90	0.065	166.67	46.62
24	160	1.10	0.065	145.45	40.69
25	170	1.00	0.065	170.00	47.55

Table 2. Surface roughness and density of samples

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Table 2. Surface roughness and density of samples

Sample No.	RoughnessR_a /μm	Density ρ /（g·cm^-3）	Sample No.	RoughnessR_a /μm	Density ρ /（g·cm^-3）	Sample No.	RoughnessR_a /μm	Density ρ /（g·cm^-3）
1	9.064	4.404	10	8.426	4.368	19	8.637	4.403
2	7.395	4.386	11	9.689	4.396	20	6.527	4.390
3	7.515	4.394	12	9.315	4.413	21	7.687	4.398
4	7.499	4.420	13	6.831	4.413	22	7.187	4.406
5	6.101	4.416	14	5.943	4.404	23	9.909	4.411
6	4.799	4.384	15	5.611	4.415	24	5.332	4.388
7	5.597	4.424	16	6.179	4.402	25	10.028	4.401
8	6.906	4.395	17	10.291	4.408
9	9.064	4.395	18	6.309	4.402

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Hailong Shao, Zixiong Lin, Zheng Zhang, Yichao Wang, Ming Shi, Wenxiong Lin. Selective Laser Melting Process of Titanium Alloy Based on Single-Track Structure and Linear and Volumetric Energy Densities[J]. Laser & Optoelectronics Progress, 2022, 59(1): 0114007

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Paper Information

Category: Lasers and Laser Optics

Received: Apr. 7, 2021

Accepted: Apr. 21, 2021

Published Online: Dec. 23, 2021

The Author Email: Wenxiong Lin (wxlin@fjirsm.ac.cn)

DOI:10.3788/LOP202259.0114007

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology