Research of Surface Roughness and Relative Density of SLM Medical Co-Cr Alloy

Jinyan, 赵进炎 Zhao; Yi, 仇毅 Qiu; Furong, 刘富荣 Liu; Jimin, 陈继民 Chen

doi:10.3788/al20143406.524

Cited by 4 publications

(2 citation statements)

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“…When the laser energy density was 225 J/mm 3 , the relative density was 96.95%. An inverse change was observed between roughness and relative density in LPBF-processed AlSi10Mg, which is accordant with chrome-cobalt alloy [23] and 316 stainless steel [24] produced by LPBF. Mumtaz et al [25] discovered that reduced scan speed, e.g., increased energy density, reduced top surface roughness but increased side roughness.…”

Section: The Effects Of Energy Density On Roughnesssupporting

confidence: 60%

Research on Surface Roughness of AlSi10Mg Parts Fabricated by Laser Powder Bed Fusion

Bai

et al. 2018

Metals

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AlSi10Mg cubes were fabricated with the laser powder bed fusion (LPBF) process, using different exposure times and scan strategies to gain insight into the effect of energy density and part orientation on surface roughness. The results showed that, with increasing energy density, the five-face roughness first decreased and then increased, whereas the top roughness increased slightly. Moreover, considerable differences in roughness appeared for the different faces. A good surface quality was obtained at 175 J/mm 3 and 200 J/mm 3 when the rotation start angle and rotation increment angle were set as 0 in meander scan mode. The roughness variation was caused by the scan direction, gas flow direction, and wiper movement direction. The scan strategies with rotation increments of 90 • effectively narrowed the variation. These results support direct part orientation and placement and can guide users to further reduce roughness through process optimisation or simplification of post-processing procedures.

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Section: The Effects Of Energy Density On Roughnesssupporting

confidence: 60%

Research on Surface Roughness of AlSi10Mg Parts Fabricated by Laser Powder Bed Fusion

Bai

et al. 2018

Metals

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“…Compared with traditional manufacturing technology, SLM technology is theoretically not limited to complex geometries, and it can form functional parts with nearly 100% density of any complex structure. SLM technology [1,2,3] has been extended from conceptual mould design to mould design in aerospace, biomedical and automotive fields.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Measurement of Stress in SLM 316L Stainless Steel Forming Parts Manufactured Using Different Scanning Strategies

2019

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Selective Laser Melting (SLM) technology is a new kind of additive manufacturing technology developed in in the last decade. Measurement and control of stress in metal forming layer is the basic problem of SLM forming parts. Critical Refraction Longitudinal (LCR) wave method was used to measure stress. The acoustic-elastic formulas for measuring stresses in SLM 316L stainless steel forming parts manufactured using meander, stripe, and chess board scanning strategies, respectively, were established based on static load tensile test. The experimental results show that the acoustic time difference of LCR wave in SLM specimen manufactured with 316L stainless steel increases linearly with the increase of stress when the tensile stress is less than critical stress (372 MPa, 465 MPa, and 494 MPa). Due to the inhomogeneous deformation of the anisotropic SLM forming layer and the dimple-micropore aggregation fracture mechanism, the acousto-elastic curve fluctuates up and down along the irregular curve when the tensile stress is larger than critical stress. The results of corroboration experiments show that nondestructive measurement of stress in SLM forming specimen can be realized by using LCR wave method. The scanning strategy can significantly affect the tensile strength and yield strength of SLM forming specimen. The stresses were all in tension stress state at the edge of the specimens, whatever scanning strategy was used. Sub-area scanning and scanning sequence of alternate and intersect were adopted, which can effectively reduce the stress in the SLM forming specimen. The overall stress values of SLM forming specimen manufactured using chess board scanning strategy were smaller than that using meander and stripe strategies. The distribution of stress were more uniform.

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Selective laser remelting of an additive layer manufacturing process on AlSi10Mg

Liu

2019

Results in Physics

130

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Research of Surface Roughness and Relative Density of SLM Medical Co-Cr Alloy

Cited by 4 publications

References 0 publications

Research on Surface Roughness of AlSi10Mg Parts Fabricated by Laser Powder Bed Fusion

Research on Surface Roughness of AlSi10Mg Parts Fabricated by Laser Powder Bed Fusion

Ultrasonic Measurement of Stress in SLM 316L Stainless Steel Forming Parts Manufactured Using Different Scanning Strategies

Selective laser remelting of an additive layer manufacturing process on AlSi10Mg

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