Numerical Simulation and Verification of Laser-Polishing Free Surface of S136D Die Steel

Zhou, Houming; Zhao, Zhenyu; Li, Kai; Yin, Jie

doi:10.3390/met11030400

Cited by 20 publications

(7 citation statements)

References 23 publications

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“…Kang et al [9] developed a laser polishing technology with ultrasonic vibration, which realized the uniform heating of micro peaks and valleys on the 304 steel surface, and the surface morphology was remarkably improved. Zhou et al [10] investigated the influence of laser polishing on the surface morphology of S316D tool steel by numerical simulation and experimental methods. The experimental results indicate that the initial surface roughness could be reduced to 0.764 µm, and the error between the actual molten and simulated pool depth was 5.3%.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on surface topography and microhardness of laser polished-hardened AISI D2 tool steel

Liu

Zhou

Wang

et al. 2022

Int J Adv Manuf Technol

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In this work, a laser polishing-hardening (LPH) method with integration and high efficiency for the treatment of AISI D2 tool steel was proposed, and the effects of laser hardening (LH), laser polishing (LP) and LPH treatments on the surface topography and microhardness were examined. The results show that LH method had a negligible effect on the surface roughness of the treated sample, while the surface roughness Ra of LP and LPH specimens was reduced by 74.6% and 80.9% respectively, indicating that the milled surface topography had been significantly improved, especially LPH was more effective in reducing the roughness. Besides, the polishing efficiency of LPH was 10 times that of LP approach. In terms of hardness improvement, the near-surface microhardness of LH and LPH samples increased by 1.5 times and 1.3 times respectively, and the effective hardened zone (EHZ) depth was 0.42 mm and 0.24 mm respectively, demonstrating that these two laser processing methods had a beneficial effect on the cross-section microhardness of D2 tool steel, while the increase of LP on the microhardness was insignificant. The comprehensive analysis of the surface morphology and microhardness of LPH specimen indicates that LPH was a feasible laser surface treatment method for D2 tool steel. On the premise of ensuring a high surface finish, the polishing efficiency can be remarkably improved, the subsurface microhardness and EHZ depth of processed specimen can be also significantly enhanced, which provided a feasible idea for the application of laser surface treatment technology in industrial mold production.

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Section: Introductionmentioning

confidence: 99%

A comparative study on surface topography and microhardness of laser polished-hardened AISI D2 tool steel

Liu

Zhou

Wang

et al. 2022

Int J Adv Manuf Technol

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“…Laser polishing for metals is typically based on melting a thin surface layer of the workpiece followed by surface smoothening using interfacial tension. In this case, the existing material of the “hills” is used to fill the “valleys” in the surface texture [ 17 , 18 , 19 ]. Ma et al [ 20 ] used a fiber laser to polish the additive manufactured (AM) Ti 6 Al 4 V alloys parts.…”

Section: Introductionmentioning

confidence: 99%

Study on Laser Polishing of Ti6Al4V Fabricated by Selective Laser Melting

Huang,

Zeng,

Wang

et al. 2024

Micromachines

Self Cite

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Laser-based additive manufacturing has garnered significant attention in recent years as a promising 3D-printing method for fabricating metallic components. However, the surface roughness of additive manufactured components has been considered a challenge to achieving high performance. At present, the average surface roughness (Sa) of AM parts can reach high levels, greater than 50 μm, and a maximum distance between the high peaks and the low valleys of more than 300 μm, which requires post machining. Therefore, laser polishing is increasingly being utilized as a method of surface treatment for metal alloys, wherein the rapid remelting and resolidification during the process significantly alter both the surface quality and subsurface material properties. In this paper, the surface roughness, microstructures, microhardness, and wear resistance of the as-received, continuous wave laser polishing (CWLP), and pulsed laser polishing (PLP) processed samples were investigated systematically. The results revealed that the surface roughness (Sa) of the as-received sample was 6.29 μm, which was reduced to 0.94 μm and 0.84 μm by CWLP and PLP processing, respectively. It was also found that a hardened layer, about 200 μm, was produced on the Ti6Al4V alloy surface after laser polishing, which can improve the mechanical properties of the component. The microhardness of the laser-polished samples was increased to about 482 HV with an improvement of about 25.2% compared with the as-received Ti6Al4V alloy. Moreover, the coefficient of friction (COF) was slightly reduced by both CWLP and LPL processing, and the wear rate of the surface layer was improved to 0.790 mm3/(N∙m) and 0.714 mm3/(N∙m), respectively, under dry fraction conditions.

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“…CW laser is usually used for rough polishing, while pulsed laser is mainly used for fine polishing [ 23 , 24 ]. Zhou et al [ 25 ] used CW laser to polish S136D mold steel, and designed L16 (44) orthogonal experiment to explore the change of surface roughness of S136D mold steel with fluence, and the results showed that the surface roughness Ra decreased from 5.358 µm to 0.764 µm. Chang et al [ 26 ] studied the CW laser polishing of SKD61 tool steel with a wavelength of 1070 nm, and found that polishing SKD61 tool steel with higher fluence produced surface ripples.…”

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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Numerical Simulation and Verification of Laser-Polishing Free Surface of S136D Die Steel

Cited by 20 publications

References 23 publications

A comparative study on surface topography and microhardness of laser polished-hardened AISI D2 tool steel

A comparative study on surface topography and microhardness of laser polished-hardened AISI D2 tool steel

Study on Laser Polishing of Ti6Al4V Fabricated by Selective Laser Melting

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

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