Chinese Journal of Lasers, Volume. 48, Issue 18, 1802009(2021)
Heterogeneity of 316L/IN718 Formed via Selective Laser Melting Based on Laser Remelting Optimization Process
Figures & Tables(17)
Fig. 2. Forming schematics of two kinds of 316L/IN718 heterogeneous formed parts. (a) Different-layer; (b) same-layer
Fig. 3. Two different scanning strategies. (a) Island scanning; (b) group scanning
Fig. 4. Physical images of 316L/IN718 same-layer heterogeneous parts. (a) Formed parts; (b) tensile specimen
Fig. 5. Influences of laser remelting process parameters on top surface roughness of 316L. (a) Influence of laser power; (b) influence of scanning speed; (c) influence of remelting times
Fig. 6. Morphologies of top surface at different laser remelting process parameters. Laser power: (a) 240 W, (b) 300 W, (c) 320 W; scanning speed; (d) 250 mm/s, (e) 450 mm/s, (f) 650 mm/s; remelting times: (g) 0, (h) 1, (i) 5
Fig. 7. Morphologies of different-layer 316L/IN718 interface. (a) Un-remelting; (b) remelting
Fig. 8. Morphologies of same-layer 316L/IN718 interface. (a) Un-remelting; (b) remelting
Fig. 9. Changes of element content at same-layer 316L/IN718 interface. (a) Un-remelting; (b) remelting
Fig. 10. Element distribution at same-layer 316L/IN718 interface. (a) Un-remelted interface; (b)--(c) elementsdistribution at un-remelted interface; (d) remelted interface; (e)--(f) elements distribution at remelted interface
Fig. 11. Tensile test results of 316L/IN718 same-layer heterogeneous samples before and after remelting optimization.(a) Stress-strain curves; (b) mechanical properties
Fig. 12. Fracture morphologies of same-layer 316L/IN718 tensile samples. (a) Un-remelting; (b) remelting; (c) area A of IN718; (d) area B of interface; (e) area C of 316L
Table 1. Main constituent elements of 316L and IN718 powders
View tableTable 1. Main constituent elements of 316L and IN718 powders
Material Mass fraction /% Fe Ni Cr Nb Mo Ti Mn Cu Si 316L 66.06 12.16 17.06 -- 2.59 -- 1.58 0.15 0.82 IN718 19.92 51.17 19.75 4.97 2.92 0.77 <0.01 <0.1 --
Table 2. Fluidity test of two powder materials
View tableTable 2. Fluidity test of two powder materials
Material Repose angle /(°) Apparent density /(g·cm-3) Tap density /(g·cm-3) 316L 25.3 4.240 4.957 IN718 26.2 4.308 5.088
Table 3. Process parameters of two powders
View tableTable 3. Process parameters of two powders
Parameter 316 L IN718 Laser power /W 300 400 Scanning speed /(mm·s-1) 850 1000 Layer thickness /mm 0.05 0.05 Scanning space /mm 0.07 0.07
Table 4. Process parameters of laser remelting experiment on 316L formed parts top surface
View tableTable 4. Process parameters of laser remelting experiment on 316L formed parts top surface
Factor Level Laser power /W 240 260 280 300 320 -- Scanning speed /(mm·s-1) 250 350 450 550 650 -- Remelting times 0 1 2 3 4 5
Table 5. Laser remelting process parameters of 316L/IN718 same-layer heterogeneous formed parts
View tableTable 5. Laser remelting process parameters of 316L/IN718 same-layer heterogeneous formed parts
Item E316L/(J·mm-3) Einterface/(J·mm-3) EIN718/(J·mm-3) η /% Un-remelting 100.84 -- 114.28 72 1st remelting 100.84 108.57 114.28 72 2nd remelting 100.84 108.57 114.28 76
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Yuchao Bian, Yingbo Peng, Lingfeng Song, Hongwei Tang, Guanglu Cai, Gaoyan Zhong, Shoufeng Yang. Heterogeneity of 316L/IN718 Formed via Selective Laser Melting Based on Laser Remelting Optimization Process[J]. Chinese Journal of Lasers, 2021, 48(18): 1802009
Paper Information
Category: laser manufacturing
Received: Feb. 3, 2021
Accepted: Apr. 9, 2021
Published Online: Sep. 7, 2021
The Author Email: Zhong Gaoyan (gyzhong@njau.edu.cn)
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