Surface and subsurface characteristics of laser polished Ti6Al4V titanium alloy

Jaritngam, Pakin; Tangwarodomnukun, Viboon; Qi, Huan; Dumkum, Chaiya

doi:10.1016/j.optlastec.2020.106102

Cited by 32 publications

(14 citation statements)

References 23 publications

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“…It was found that the minimal roughness (0.56 μm) was acquired at higher power (150 w) and high scanning speed (30 mm∕s). This finding is very similar to that of Jaritngam et al 49 The surface roughness decreases slightly with the increase of scanning speed and power. Generally speaking, the increase or decrease of the surface roughness is related to the heat input and laser-material interaction time.…”

Section: Surface Morphology and Roughnesssupporting

confidence: 91%

“…During the process of laser irradiation, the temperature of the workpiece ascends gradually, and the heat accumulation is sufficient with the increase of heat input, leading to the thickening of the recast layer and the deepening of the heat-affected area. Jaritngam et al 49 studied the effects of different laser powers and scanning speeds on the thickness of the recast layer and the depth of the heat-affected zone. It was found that when the power was 30 W and the scanning speed was 50 mm∕s, the thickest recast layer was 70 μm, and the deepest heat affected zone was 262 μm.…”

Section: Microstructurementioning

confidence: 99%

“…4 (a) Thickness of recast layer and (b) depth of heat-affected zone induced by the different laser polishing conditions and initial surface roughness. 49 during rapid solidification because the solubility of Al in Ti is very low when the temperature reaches 500°C to 600°C and Ti 3 Al phase precipitates. When the heat input is higher, such as through decreasing the scanning speed, the material maintains a high temperature for a relatively long time and promote further precipitation.…”

Section: Microstructurementioning

confidence: 99%

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Laser polishing of additive manufactured Ti6Al4V alloy: a review

Zuo

2021

Opt. Eng.

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Additive manufactured Ti6Al4V alloy has excellent comprehensive properties and has broad application prospects in the aerospace, biomedicine, and other fields. However, the fabricated components are too rough to use directly. So, a corresponding postprocess is needed urgently. The conventional finishing process cannot meet the requirements of green and efficient processing because of its time consumption, environmental pollution, and low productivity. Laser polishing, as a highly efficient and noncontact post-treatment technology, has attracted more and more attention in the polishing of additive manufactured Ti6Al4V alloy. The research of laser polishing of Ti6Al4V alloy in recent years has expatiated and includes laser polishing mechanisms, surface roughness and morphology, microstructure, mechanical properties, and finite element simulation analysis during laser polishing. Furthermore, the existing challenges of laser-polished Ti6Al4V alloy are summarized, and future development directions are proposed.

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Section: Surface Morphology and Roughnesssupporting

confidence: 91%

Section: Microstructurementioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

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Laser polishing of additive manufactured Ti6Al4V alloy: a review

Zuo

2021

Opt. Eng.

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“…This mechanism is relevant to the laser surface melting/polishing process that the capillary and thermocapillary effects play an important role in altering the morphology and roughness of laser-irradiated surface. 22 The maximum Ra was found to be about 5 μm when 10-W laser power was applied together with the laser scan speed of 350 mm/s.…”

Section: Resultsmentioning

confidence: 92%

Fabrication of superhydrophobic surface on AISI316L stainless steel using a nanosecond pulse laser

Tangwarodomnukun

Kringram

Zhu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser texturing process is a promising method to alter the wettability of metal surface on which micro/nano rough structures are created for changing the contact angle between the textured surface and liquid droplet. This paper aims at fabricating a superhydrophobic surface on AISI316L stainless steel, and a nanosecond pulse laser was employed for texturing line and point patterns on the metal surface. The influences of texturing patterns, laser power, scan speed, irradiation duration, and aging hours on the water contact angle and morphology of workpiece surface were investigated. According to the results, the hydrophilic surface was obtained right after the texturing process, and the surface turned to be hydrophobic after being left in ambient air for 15 days. The aging of laser-textured surface was also performed to induce the chemisorption of hydrocarbons toward the surface. This post process was able to shorten the hydrophilic-to-hydrophobic transition from days to a few hours. The aging duration of 2 and 0.5 h was respectively recommended for yielding and stabilizing the superhydrophobicity on line- and point-patterned surfaces. The maximum contact angle of 159.61° was achievable when the point pattern was textured on the stainless steel surface by using the laser power of 10 W and irradiation duration of 0.18 ms.

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“…In recent years, a large number of scholars have researched the effects of fluence [ 14 ], scanning speed [ 15 ], defocus amount [ 16 ], laser incidence angle [ 17 ], and pulse laser radiation [ 18 ] on the laser polishing effect. Jaritngam et al [ 19 ] studied nanosecond laser polishing of Ti6Al4V titanium alloy, which showed that when laser fluence is 1~3 J/cm 2 , surface roughness Sa decreased by 43%. Chow et al [ 20 ] explored the effect of different defocus amounts on the surface roughness of polished mold steel, and the results showed that when the defocus amounts was greater than 2.2 mm, the surface roughness of AISI H13 mold steel reduced by 39.7%.…”

Section: Introductionmentioning

confidence: 99%

Effects of Scanning Speed on the Polished Surface Quality of Mold Steel by Dual-Beam Coupling Nanosecond Laser

et al. 2023

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In this paper, a novel dual-beam coupled nanosecond laser was used to polish S136D mold steel. The effects of scanning speed, total fluence, spot overlap ratio, and SPSN on surface quality were analyzed. The polished surface roughness Ra without ultrasonic cleaning is too large due to slag, splash, and dust produced by laser polishing. When scanning speed is 1250 mm/min, surface roughness Ra with ultrasonic cleaning is reduced from the original surface 1.92 μm to 0.72 μm, and the surface roughness Ra is reduced by 62.50%. When the Ftot is 35.38 J/cm2, the minimum value of surface roughness Ra is 0.72 μm. If the total fluence is higher or lower, it is not conducive to reducing the surface roughness, the total fluence is higher, and there is a polished surface with SOM phenomenon. The polished surface with spot overlap ratio of 98.55% has a smooth morphology, and a minimum value of surface roughness Ra of 0.41 μm. When the specimen is inclined at a certain angle, the high-magnification camera captures color on the polished surface. It is found that the microscopic texture of molten material flow trace and polishing scanning track is obvious. Polished surface is mainly distributed with Fe, Cr, C, and O elements. The surface material processing speed per unit time is low, and the polishing surface quality is improved less. The maximum surface roughness Ra is 1.98 μm. The minimum Ra of polished surface with smoother morphology is 0.41 μm, and surface profile height is basically the same. The research results show that the new dual-beam coupled nanosecond laser polishing technology can improve surface quality of materials. This research work provides process guidance for laser polishing effect analysis and mechanism innovation.

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Surface and subsurface characteristics of laser polished Ti6Al4V titanium alloy

Cited by 32 publications

References 23 publications

Laser polishing of additive manufactured Ti6Al4V alloy: a review

Laser polishing of additive manufactured Ti6Al4V alloy: a review

Fabrication of superhydrophobic surface on AISI316L stainless steel using a nanosecond pulse laser

Effects of Scanning Speed on the Polished Surface Quality of Mold Steel by Dual-Beam Coupling Nanosecond Laser

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