| 158 | 4 | 7 |
| 下载次数 | 被引频次 | 阅读次数 |
选区激光熔化中逐行逐层扫描粉末成形的熔道以及熔结表面在很大程度上影响制件质量。从选区激光熔化的工艺原理出发，得到单行扫描优化的线能量密度范围，进一步结合平均重熔率对多行扫描熔道搭接的介观表面形貌进行分析，结果表明，线能量密度在0.070～0.217 J/mm时，熔道相对连续、线宽相对均匀；多行扫描的平均重熔率过小会造成较大表面高度差，过大会产生裂纹，平均重熔率为18%～50%时能得到较为平整的熔结表面。
Abstract：Melting tracks and fusion surfaces formed by the “line by line-layer by layer” scanning in selective laser melting can greatly affect the quality of the product. Based on the process principle of selective laser melting, the optimized range of line energy density was obtained by single line scanning. The mesoscopic surface morphology of overlapped melting tracks formed by multi-line scanning was further analyzed by combining the average re-melting rate. Results show that the melting tracks are relatively continuous and the line width is relatively uniform when the linear energy density is between 0.070 and 0.217 J/mm. Small average re-melting rate of multi-line scanning will result in large surface height difference, and if the average re-melting rate is too large, the surface cracks will occur. When the average re-melting rate is between 18% and 50%, a relatively smooth surface can be obtained.
[1] LI J F,WEI Z Y,LU B H.Research progress on technology of selective laser melting of titanium and titanium alloys[J].Laser & Optoelectronics Progress,2018,55(1):011403.李俊峰，魏正英，卢秉恒.钛及钛合金激光选区熔化技术的研究进展[J].激光与光电子学进展，2018,55(1):011403.
[2] SINGH N,HAMEED P,UMMETHALA R,et al.Selective laser manufacturing of Ti-based alloys and composites:impact of process parameters,application trends,and future prospects[J].Materials Today Advances,2020,8:100097.
[3] SHIPLEY H,MCDONNELL D,CULLETON M,et al.Optimisation of process parameters to address fundamental challenges during selective laser melting of Ti6Al4V:A review[J].International Journal of Machine Tools and Manufacture,2018,128:1-20.
[4] LIANG P H,TANG Q,FENG Q X,et al.Numerical simulation and experiment of single track scanning and lapping in selective laser melting[J].Journal of Mechanical Engineering,2020,56(22):56-67.梁平华，唐倩，冯琪翔，等.激光选区熔化单道扫描与搭接数值模拟及试验[J].机械工程学报，2020,56(22):56-67.
[5] DANG X A,JIAO X L,YANG L J.Effect of SLM technology process parameters on tissue defects of porous scaffolds[J].Applied Laser,2020,40(6):998-1004.党新安，焦晓龙，杨立军.激光选区熔化工艺参数对成形多孔支架表面质量的影响研究[J].应用激光，2020,40(6):998-1004.
[6] LI Y Z,ZALO■NIK M,ZOLLINGER J,et al.Effects of the powder,laser parameters and surface conditions on the molten pool formation in the selective laser melting of IN718[J].Journal of Materials Processing Technology,2021,289:116930.
[7] PAL S,LOJEN G,HUDAK R,et al.As-fabricated surface morphologies of Ti6Al4V samples fabricated by different laser processing parameters in selective laser melting[J].Additive Manufacturing,2020,33:101147.
[8] KHORASANI A,GIBSON I,AWAN U S,et al.The effect of SLM process parameters on density,hardness,tensile strength and surface quality of Ti6Al4V[J].Additive Manufacturing,2019,25:176-186.
[9] ZONG X W,GAO Q,ZHOU H Z,et al.Effects of bulk laser energy density on anisotropy of selective laser sintered 316L stainless steel[J].Chinese Journal of Lasers,2019,46(5):0502003.宗学文，高倩，周宏志，等.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.
[10] RONG T,REN Z N,ZENG Z Q,et al.Microstructure and mechanical properties of selective laser melting high-strength TiB2/AlSi10Mg parts[J].Applied Laser,2020,40(6):1017-1022.荣婷，任治倪，曾志强，等.选区激光熔化高强铝合金TiB2/AlSi10Mg显微组织及力学性能研究[J].应用激光，2020,40(6):1017-1022.
[11] PAL S,LOJEN G,KOKOL V,et al.Evolution of metallurgical properties of Ti6Al4V alloy fabricated in different energy densities in the Selective Laser Melting technique[J].Journal of Manufacturing Processes,2018,35:538-546.
[12] XIANG Z W,YAN R,WU X Y,et al.Surfacemorphology evolution with laser surface re-melting in selective laser melting[J].Optik,2020,206:164316.
[13] CHEN S,TAO F H,JIA C Z,et al.Effect of laser remelting on microstructure and properties of 4Cr5MoSiV1 steel fabricated by selective laser melting[J].Surface Technology,2020,49(12):209-219.陈帅，陶凤和，贾长治，等.激光重熔对选区激光熔化成形4Cr5MoSiV1钢组织和性能的影响[J].表面技术，2020,49(12):209-219.
[14] HU Z H,NAGARAJAN B,SONG X,et al.Formation of SS316Lsingle tracks in micro selective laser melting:surface,geometry,and defects[J].Advances in Materials Science and Engineering,2019,2019:9451406.
[15] HUAN J,TIAN Z J,LIANG H X,et al.Study on forming process and surface topography of titanium alloy by selective laser melting process[J].Applied Laser,2018,38(2):183-189.宦君，田宗军，梁绘昕，等.选区激光熔化钛合金成形工艺和表面形貌研究[J].应用激光，2018,38(2):183-189.
[16] YANG Y,DANG M Z,LI W,et al.Study on cracking mechanism and inhibiting process of TiAl alloys fabricated by selective laser melting[J].Journal of Mechanical Engineering,2020,56(3):181-188.杨益，党明珠，李伟，等.激光选区熔化钛铝合金裂纹形成机理及抑制研究[J].机械工程学报，2020,56(3):181-188.
基本信息:
DOI：10.14128/j.cnki.al.20224201.015
中图分类号:TG665
引用信息:
[1]荣远卓,杨寅晨,李晓峰,等.基于熔结表面的钛合金粉末选区激光熔化试验研究[J].应用激光,2022,42(01):15-20.DOI:10.14128/j.cnki.al.20224201.015.
基金信息:
安徽省重点研究与开发计划(1704a0902051)
2021-03-24
2021
2021-04-13
2021
1
2022-01-25
2022-01-25