激光与光电子学进展, 2020, 57 (21): 211404, 网络出版: 2020-10-26
脉冲激光对选区激光熔融Ti6Al4V钛合金表面质量及变形量的影响 
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Effects of Pulsed Laser on Surface Quality and Deformation of Selective Laser Melted Ti6Al4V Titanium Alloy
激光器与激光光学 激光材料加工 选区激光熔融工艺 脉冲激光 致密度 表面粗糙度 变形量 lasers and laser optics laser material processing selective laser melting process pulsed laser relative density surface roughness deformation
摘要
分别采用脉冲激光和连续激光作为选区激光熔融工艺的热源,研究了不同激光平均功率和脉冲占空比对Ti6Al4V钛合金试样致密度、表面粗糙度和显微组织等参数的影响。实验结果表明,相比连续激光,脉冲占空比为60%~70%的脉冲激光可以显著提高试样的表面质量,表面粗糙度最低为3.6 μm,使试样晶粒宽度由(1.14±0.23) μm减小到(0.85±0.18) μm,且能有效消除连续激光加工时因热应力累积导致的翘曲变形。
Abstract
In this paper, using pulsed laser and continuous laser as the heat source of the selective laser melting process, the effects of different laser average powers and pulse duty cycles on the density, surface roughness, and microstructure of Ti6Al4V titanium alloy samples are studied. Experimental results show that compared with continuous laser, the use of pulsed laser with a duty cycle of 60%--70% can significantly improve the surface quality of the part. The surface roughness is as low as 3.6 μm, and the sample grain width is reduced from (1.14±0.23) μm to (0.85±0.18) μm, and can effectively eliminate the warpage caused by the accumulation of thermal stress during continuous laser processing.
郭庆丰, 张政, 黄李杰, 林文雄. 脉冲激光对选区激光熔融Ti6Al4V钛合金表面质量及变形量的影响[J]. 激光与光电子学进展, 2020, 57(21): 211404. Guo Qingfeng, Zhang Zheng, Huang Lijie, Lin Wenxiong. Effects of Pulsed Laser on Surface Quality and Deformation of Selective Laser Melted Ti6Al4V Titanium Alloy[J]. Laser & Optoelectronics Progress, 2020, 57(21): 211404.
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