体激光能量密度对选区激光熔化316L不锈钢各向异性的影响 下载: 1048次
Effects of Bulk Laser Energy Density on Anisotropy of Selective Laser Sintered 316L Stainless Steel
1 西安科技大学机械工程学院, 陕西 西安 710054
2 苏州中瑞智创三维科技股份有限公司, 江苏 苏州 215223
图 & 表
图 1. 生长方向示意图
Fig. 1. Schematic of growth direction
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图 2. 样件尺寸示意图
Fig. 2. Schematic of sample size
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图 3. 不同体激光能量密度下316L不锈钢的表面熔池形貌。 (a) 40.48 J·mm-3;(b) 42.42 J·mm-3;(c) 55.56 J·mm-3; (d) 64.40 J·mm-3;(e) 72.92 J·mm-3;(f) 75.76 J·mm-3;(g) 79.37 J·mm-3;(h) 83.33 J·mm-3;(i) 118.06 J·mm-3
Fig. 3. Surface weld pool morphology of 316L stainless steel obtained at different bulk laser energy densities. (a) 40.48 J·mm-3; (b) 42.42 J·mm-3; (c) 55.56 J·mm-3; (d) 64.40 J·mm-3; (e) 72.92 J·mm-3; (f) 75.76 J·mm-3; (g) 79.37 J·mm-3; (h) 83.33 J·mm-3; (i) 118.06 J·mm-3
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图 4. 体激光能量密度与抗拉强度的散点图
Fig. 4. Scatter plot of bulk laser energy density versus tensile strength
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图 5. 体激光能量密度与断后伸长率的散点图
Fig. 5. Scatter plot of bulk laser energy density versus percentage elongation after fracture
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图 6. 不同体激光能量密度下x和y向成形件的显微组织。(a) 83.33 J·mm-3;(b) 64.40 J·mm-3;(c) 40.48 J·mm-3
Fig. 6. Microstructures of x-direction and y-direction formed samples at different bulk laser energy densities. (a) 83.33 J·mm-3; (b) 64.40 J·mm-3; (c) 40.48 J·mm-3
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图 7. 不同体激光能量密度下z向成形件的显微组织。(a) 83.33 J·mm-3;(b) 64.40 J·mm-3;(c) 40.48 J·mm-3
Fig. 7. Microstructures of z-direction formed sample at different bulk laser energy densities. (a) 83.33 J·mm-3; (b) 64.40 J·mm-3; (c) 40.48 J·mm-3
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表 1粉末特性
Table1. Powder characteristics
D10 /μm | D50 /μm | D90 /μm | Tap density /(g·cm-3) | Apparent density /(g·cm-3) | Compressionlimit | Flowability /s |
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26.51 | 36.17 | 52.47 | 4.76 | 4.00 | 16 | Hall:17.03 Carney:3.79 |
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表 2316L不锈钢的主要化学成分
Table2. Main chemical composition of 316L stainless steel
Element | O | C | Cr | Mo | Si | Fe | Mn | Ni | S | P |
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Mass fraction /% | 0.0451 | 0.0095 | 17.92 | 2.42 | 0.52 | Bal. | 0.051 | 12.04 | 0.0104 | - |
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表 3四因素三水平的正交实验
Table3. Four-factor-three-level orthogonal test
Level | Factor |
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Laserpower /W | Scanspeed /(mm·s-1) | Scanspacing /mm | Growthdirection |
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1 | 200 | 800 | 0.06 | z | 2 | 170 | 1100 | 0.08 | y | 3 | 140 | 1400 | 0.10 | x |
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表 4正交实验方案安排及实验结果
Table4. Arrangement and results of orthogonal test
Trialnumber | Laserpower /W | Scan speed /(mm·s-1) | Scanspacing /mm | Tensile strength /MPa |
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x direction | y direction | z direction |
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1 | 200 | 800 | 0.10 | 755.00 | 717.67 | 637.03 | 2 | 200 | 1100 | 0.08 | 740.11 | 713.23 | 642.30 | 3 | 200 | 1400 | 0.06 | 729.34 | 707.22 | 632.84 | 4 | 170 | 800 | 0.06 | 698.02 | 702.35 | 621.01 | 5 | 170 | 1100 | 0.08 | 711.62 | 730.43 | 652.61 | 6 | 170 | 1400 | 0.10 | 611.43 | 619.95 | 552.26 | 7 | 140 | 800 | 0.08 | 726.23 | 732.45 | 659.87 | 8 | 140 | 1100 | 0.10 | 617.40 | 631.23 | 553.40 | 9 | 140 | 1400 | 0.06 | 701.02 | 704.44 | 634.94 |
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宗学文, 高倩, 周宏志, 张佳亮, 齐腾博. 体激光能量密度对选区激光熔化316L不锈钢各向异性的影响[J]. 中国激光, 2019, 46(5): 0502003. Xuewen Zong, Qian Gao, Hongzhi Zhou, Jialiang Zhang, Tengbo Qi. Effects of Bulk Laser Energy Density on Anisotropy of Selective Laser Sintered 316L Stainless Steel[J]. Chinese Journal of Lasers, 2019, 46(5): 0502003.