Laser & Optoelectronics Progress, Volume. 60, Issue 5, 0514009(2023)
Impact of Interval Remelting on TC4 Selective Laser Melting Samples
Figures & Tables(16)
Fig. 1. Micromorphology and particle size distribution of TC4 powder. (a) Powder topography; (b) percentage of powder particle size
Fig. 3. Schematic diagram of interval remelting process. (a) Two-interval remelting; (b) one-interval remelting; (c) layer-by-layer remelting
Fig. 5. Main defect types on R1 surface of non-remelted sample. (a) Conventional splash; (b) droplet splash; (c) spheroidization; (d) thermal crack
Fig. 6. SEM images of surface morphology of different samples. (a) Sample R1; (b) sample R2; (c) sample R3; (d) sample R4
Fig. 8. SEM images of internal defect morphology of R1 sample. (a) Slag; (b) hole; (c) incomplete fusion powder; (d) incomplete fusion layer
Fig. 9. Fracture morphology of different samples. (a) (b)Sample R1; (c) (d) sample R2; (e) (f) sample R3; (g) (h) sample R4
Fig. 10. Metallographic structure images of different sample. (a) (b) Sample R1; (c) (d) sample R2; (e) (f) sample R3; (g) (h) sample R4
Table 1. Chemical composition of TC4 titanium alloy powder
View tableTable 1. Chemical composition of TC4 titanium alloy powder
Element Ti Al V Fe C N H O Mass fraction /% Bal. 5.5-6.5 3.5-4.5 0.25 0.08 0.03 0.0125 0.13
Table 2. Name and purpose of experimental equipment
View tableTable 2. Name and purpose of experimental equipment
Test equipment Purpose Renishaw AM400 Print formed sample ASI SZ-2000 Automatic Stereo Zoom Microscope Measuring surface roughness VHX-600ESO Depth of field microscope Observe surface quality Instron5966 Mechanical stretching machine Conduct tensile test Phenom XL Scanning electron microscope Observe the internal defects，fracture morphology，and metallographic structure TIME6610AT Automatic micro Vickers hardness tester Measuring microhardness
Table 3. Pretest results
View tableTable 3. Pretest results
Sample Exposure time /μs Scanning speed /（mm·s-1） Volumetric energy density /（J·mm-3） Relative density /% S1 80 437.50 81.27 95.8 S2 100 350.00 101.59 97.5 S3 120 291.67 121.90 97.8 S4 140 250.00 142.22 98.3 S5 160 218.75 162.54 98.7
Table 4. Process parameters of different samples
View tableTable 4. Process parameters of different samples
Process Parameter Value Initial scanning test Laser power /W 400 Beam diameter /µm 70 Layer thickness /µm 150 Exposure time /s 140 Hatch space /µm 75 Point distance /µm 35 Scanning speed /（mm·s-1） 250 Remelting test Laser power /W 100 Point distance /µm 35 Exposure time /s 70 Scanning speed /（mm·s-1） 500 Number of remelted layers 0，2，3，6 Atmosphere Oxygen target 2×10-4 -
Table 5. TC4 forming efficiency
View tableTable 5. TC4 forming efficiency
Layer thickness /µm Remelting speed / （mm·s-1）Number of remelted layers Building rate /（mm3·s-1） Reference 30 - - 0.45 ［ 22 ］150 - - 2.81 Proposed 150 500 2 2.40 Proposed 150 500 3 2.25 Proposed 150 500 6 1.87 Proposed
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Yude Liu, Pengyue Li, Wentian Shi, Shuai Liu, Yufan Han, Yusheng Zhou. Impact of Interval Remelting on TC4 Selective Laser Melting Samples[J]. Laser & Optoelectronics Progress, 2023, 60(5): 0514009
Paper Information
Category: Lasers and Laser Optics
Received: Jan. 11, 2022
Accepted: Mar. 3, 2022
Published Online: Mar. 6, 2023
The Author Email: Yude Liu (liu_yude@163.com)
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