Modified surface morphology in surface ablation of cobalt-cemented tungsten carbide with pulsed UV laser radiation

Li, Tiejun; Lou, Qihong; Dong, Junhang; Wei, Yunrong; Liu, Jingru

doi:10.1016/s0169-4332(00)00881-3

Cited by 42 publications

(27 citation statements)

References 13 publications

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“…A lower range of surface roughness was recorded in samples processed with 0.2 mm spot size compared to samples produced at 0.4 mm spot size. Although high irradiance settings, a 0.2 mm spot size might be expected to cause an increase of surface roughness, the pulse energies and durations were reduced compared to samples process at 0.09 mm spot size [2,17,18]. Among the three samples processed using 0.2 mm spot size, the surface roughness was lower in sample N1 where the pulse energy was lowest at 0.09 J.…”

Section: Surface Roughnessmentioning

confidence: 91%

“…The beam energy can be controlled by varying laser irradiance, number of pulses or pulse repetition frequency, and pulse duration. Increased laser irradiances have been seen to result in increased surface roughness [2]. High irradiance produces high pulse energy which can violently ablate the material's surface especially when processed at a slow scan rate.…”

Section: Introductionmentioning

confidence: 99%

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Laser Surface Modification of H13 Die Steel using Different Laser Spot Sizes

Aqida¹,

Naher²,

Brabazon³

2011

AIP Conference Proceedings

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Abstract. This paper presents a laser surface modification process of AISI H13 tool steel using three sizes of laser spot with an aim to achieve reduced grain size and surface roughness. A Rofin DC-015 diffusion-cooled CO 2 slab laser was used to process AISI H13 tool steel samples. Samples of 10 mm diameter were sectioned to 100 mm length in order to process a predefined circumferential area. The parameters selected for examination were laser peak power, overlap percentage and pulse repetition frequency (PRF). Metallographic study and image analysis were done to measure the grain size and the modified surface roughness was measured using two-dimensional surface profilometer. From metallographic study, the smallest grain sizes measured by laser modified surface were between 0.51 µm and 2.54 µm. The minimum surface roughness, R a , recorded was 3.0 µm. This surface roughness of the modified die steel is similar to the surface quality of cast products. The grain size correlation with hardness followed the findings correlate with Hall-Petch relationship. The potential found for increase in surface hardness represents an important method to sustain tooling life.

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Section: Surface Roughnessmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Laser Surface Modification of H13 Die Steel using Different Laser Spot Sizes

Aqida¹,

Naher²,

Brabazon³

2011

AIP Conference Proceedings

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show abstract

“…Regarding surface modification by LST, surface quality resulting from laser beams can be influenced by the inherent properties of the laser beams. Previous studies regarding surface quality have mostly focused on the influence of the inherent properties of laser beams, such as pulse duration, pulse energy and wavelength [13][14][15]. However, laser processing conditions, especially the interactions and correlation between the machining parameters and the microstructural properties of the material, can also play an important role in laser ablation and, consequently, on the induced machining quality [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size

et al. 2018

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Abstract:The ultra-short pulse laser has attracted attention as an advanced tool for functionalizing surface topography, since it has high accuracy and results in little damage. In a previous study, some innovative patterns were introduced on cemented carbide surfaces, such as dimples, which are commonly used as oil reservoirs for bearings. The accuracy is not only related to the inherent features of the laser, but also to the machining processes. Within this context, this study aims to investigate the influence of machining parameters (i.e., pulse number in this study) on the ablation mechanism and resulting surface integrity. Two cemented carbide grades, possessing similar chemical composition but different grain size (small and large), are machined using a femtosond laser set-up with variant pulse number (1-20). The geometrical properties of the produced structure and surface integrity are statistically investigated using different microscopy techniques. It is found that the dimple depth is approximately proportional to the pulse number for both grades, and the coarse grade leads to a higher rate of depth increase. Damage is found in the form of melting and cracking for the binder and the grains, respectively; but this is more pronounced for large-grain grade in terms of the scale and depth. However, these observations are only found at a very superficial position.

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“…In pulse laser surface processing, the laser modified surface mechanical and physical properties were controlled by several independent laser parameters namely; peak power, duty cycle, PRF and traverse speed [1,2]. The pulse energy and laser-surface interaction time determined the temperature profile and also increased both width and depth of hardened surface [3].…”

Section: Introductionmentioning

confidence: 99%

Designing Pulse Laser Surface Modification of H13 Steel Using Response Surface Method

Aqida¹,

Brabazon²,

Naher³

2011

AIP Conference Proceedings

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Abstract. This paper presents a design of experiment (DOE) for laser surface modification process of AISI H13 tool steel in achieving the maximum hardness and minimum surface roughness at a range of modified layer depth. A Rofin DC-015 diffusion-cooled CO 2 slab laser was used to process AISI H13 tool steel samples. Samples of 10 mm diameter were sectioned to 100 mm length in order to process a predefined circumferential area. The parameters selected for examination were laser peak power, overlap percentage and pulse repetition frequency (PRF). The response surface method with Box-Behnken design approach in Design Expert 7 software was used to design the H13 laser surface modification process. Metallographic study and image analysis were done to measure the modified layer depth. The modified surface roughness was measured using two-dimensional surface profilometer. The correlation of the three laser processing parameters and the modified surface properties was specified by plotting three-dimensional graph. The hardness properties were tested at 981 mN force. From metallographic study, the laser modified surface depth was between 37 µm and 150 µm. The average surface roughness recorded from the 2D profilometry was at a minimum value of 1.8 µm. The maximum hardness achieved was between 728 and 905 HV 0.1 .These findings are significant to modern development of hard coatings for wear resistant applications.

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Modified surface morphology in surface ablation of cobalt-cemented tungsten carbide with pulsed UV laser radiation

Cited by 42 publications

References 13 publications

Laser Surface Modification of H13 Die Steel using Different Laser Spot Sizes

Laser Surface Modification of H13 Die Steel using Different Laser Spot Sizes

Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size

Designing Pulse Laser Surface Modification of H13 Steel Using Response Surface Method

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