Infrared and Laser Engineering, Volume. 49, Issue 8, 20190523(2020)
Mechanical properties of 316L stainless steel porous structure formed by selective laser melting
Figures & Tables(15)
Fig. 3. Porous unit. (a) Regular dodecahedron unit; (b) Body centered cubic structural unit
Fig. 4. Porous samples. (a) Regular dodecahedron sample; (b) Body centered cubic sample
Fig. 5. SLM shaped porous structure sample. (a) Regular dodecahedron porous structure; (b) Body centered cubic porous structure
Fig. 6. Microscopic features of SLM formed porous structure. (a) Regular dodecahedron porous structure; (b) Body centered cubic porous structure
Fig. 7. Compression stress and strain curves of porous 316L stainless steel. (a) Regular dodecahedron porous structure; (b) Body centered cubic porous structure
Fig. 8. (a) Relationship between porosity and elastic modulus; (b) Relationship between porosity and compressive strength （RD: porous structure of regular dodecahedron; BCC: body centered cubic porous structure)
Fig. 9. (a) Relation between average pore diameter and elastic modulus; (b) Relation between average pore diameter and compressive strength （RD: porous structure of regular dodecahedron; BCC: body centered cubic porous structure)
Fig. 10. (a) Relationship between volume to area ratio and elastic modulus ; (b) Relationship between volume to area ratio and compressive strength
Table 1.
Chemical composition of 316L stainless power (wt.%)
316L不锈钢粉末化学成分（质量分数%）
View tableView in ArticleTable 1.
Chemical composition of 316L stainless power (wt.%)
316L不锈钢粉末化学成分（质量分数%）
C Mn Si Cr Ni P S Mo Fe ≤0.03 <5.00 <1.00 16.0-18.0 10.0~25.0 ≤0.045 ≤0.03 <5.00 Allowance
Table 2.
Technological parameter
工艺参数
View tableView in ArticleTable 2.
Technological parameter
工艺参数
Laser power /W Scan speed /mm·s-1 Hatch spacing/mm Powder-bed depth/mm Scanning strategy 250 650 0.06 0.02 Single-direction sweeping
Table 3.
Parameter design of porous element
多孔单元参数设计
View tableView in ArticleTable 3.
Parameter design of porous element
多孔单元参数设计
Sample Parameter Design 1 Design 2 Design 3 Design 4 Design 5 Regular dodecahedron structure Volume to area ratio 4.33 3.82 3.40 3.04 2.74 Average pore diamete/mm 3.29 3.56 3.78 4.00 4.22 Porosity 55.13% 60.21% 65.46% 69.88% 72.44% Body centered cubic structure Volume to area ratio 2.12 1.26 0.95 0.70 0.54 Average pore diamete/mm 1.90 2.48 3.06 3.64 4.22 Porosity 79.64% 86.82% 90.71% 93.15% 94.74%
Table 4.
Compressive strength calculated by compression test
压缩试验计算的抗压强度
View tableView in ArticleTable 4.
Compressive strength calculated by compression test
压缩试验计算的抗压强度
Sample Design number Average compressive strength/MPa Regular dodecahedron structure Design 1 160.31 Design 2 150.65 Design 3 134.95 Design 4 129.25 Design 5 111.75 Body centered cubic structure Design 1 158.03 Design 2 92.07 Design 3 66.97 Design 4 53.05 Design 5 43.19
Table 5.
Elastic modulus calculated by compression test
压缩试验计算的弹性模量
View tableView in ArticleTable 5.
Elastic modulus calculated by compression test
压缩试验计算的弹性模量
Sample Design number Average elastic modulus/GPa Predicted value by Gibson-Ashby formula/GPa Deviation Regular dodecahedron sample Design 1 1.042 2.729 46.61% Design 2 1.223 2.201 Design 3 1.030 1.877 Design 4 0.925 1.769 Design 5 0.919 1.347 Body centered cubic structure Design 1 1.716 3.049 27.94% Design 2 1.070 1.350 Design 3 0.672 0.720 Design 4 0.553 0.464 Design 5 0.375 0.250
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Shoujin Zeng, Qirui Wu, Jianhua Ye. Mechanical properties of 316L stainless steel porous structure formed by selective laser melting[J]. Infrared and Laser Engineering, 2020, 49(8): 20190523
Paper Information
Category: 激光器与激光光学
Received: Dec. 8, 2019
Accepted: Jan. 13, 2016
Published Online: Dec. 31, 2020
The Author Email: Zeng Shoujin (zengshoujin@fjut.edu.cn)
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