Pub Date : 2020-01-01DOI: 10.2961/jlmn.2020.03.2017
T. Hanemann, C. Seyfert, P. Holfelder, A. Rota, M. Heilmaier
{"title":"Dimensionless Enthalpy as Characteristic Factor for Process Control in Laser Powder Bed Fusion","authors":"T. Hanemann, C. Seyfert, P. Holfelder, A. Rota, M. Heilmaier","doi":"10.2961/jlmn.2020.03.2017","DOIUrl":"https://doi.org/10.2961/jlmn.2020.03.2017","url":null,"abstract":"","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":"88 1","pages":"257"},"PeriodicalIF":1.1,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72649075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-20DOI: 10.2961/jlmn.2019.02.0005
W. Rossi, A. Vieira
The aim of this work was to texturize surfaces of steel engine components to reduce the coefficient of dynamic friction and wear between two surfaces. The elements of the texture had the shape of a spherical half-shell and were produced by the overlap of femtosecond laser pulses with donut shape. The incubation effect was estimated using the D-scan method to relate the ablation threshold to the number of overlapping pulses. Thus, the control of the focal position of the laser beam and the number of overlapped pulses, taking into account the effects of incubation, made it possible to obtain this type of dimple with controlled shape and size. A distribution of dimples with density of 11% caused an 18% reduction in the coefficient of friction in a tribological pair DIN 16MnCr5 and SAE 52100 steel sphere.
{"title":"Texturization of Engine Components with Shaped Ultrashort Laser Pulses","authors":"W. Rossi, A. Vieira","doi":"10.2961/jlmn.2019.02.0005","DOIUrl":"https://doi.org/10.2961/jlmn.2019.02.0005","url":null,"abstract":"The aim of this work was to texturize surfaces of steel engine components to reduce the coefficient of dynamic friction and wear between two surfaces. The elements of the texture had the shape of a spherical half-shell and were produced by the overlap of femtosecond laser pulses with donut shape. The incubation effect was estimated using the D-scan method to relate the ablation threshold to the number of overlapping pulses. Thus, the control of the focal position of the laser beam and the number of overlapped pulses, taking into account the effects of incubation, made it possible to obtain this type of dimple with controlled shape and size. A distribution of dimples with density of 11% caused an 18% reduction in the coefficient of friction in a tribological pair DIN 16MnCr5 and SAE 52100 steel sphere.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45421548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.2961/jlmn.2019.03.0011
M. Panov, Ilia Aliabev, E. Khairullina, V. Mironov, I. Tumkin
{"title":"Fabrication of Nickel-Gold Microsensor Using In Situ Laser-Induced Metal Deposition Technique","authors":"M. Panov, Ilia Aliabev, E. Khairullina, V. Mironov, I. Tumkin","doi":"10.2961/jlmn.2019.03.0011","DOIUrl":"https://doi.org/10.2961/jlmn.2019.03.0011","url":null,"abstract":"","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":"40 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84542594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.2961/jlmn.2019.03.0004
{"title":"Studies on Microdrilling of NbN Superconductor using Pulsed Laser Ablation","authors":"","doi":"10.2961/jlmn.2019.03.0004","DOIUrl":"https://doi.org/10.2961/jlmn.2019.03.0004","url":null,"abstract":"","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46874547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.2961/jlmn.2019.03.0003
{"title":"Picosecond Laser Fabrication of the Riblet-Array Surface Texture on Ti64 Alloy Substrate","authors":"","doi":"10.2961/jlmn.2019.03.0003","DOIUrl":"https://doi.org/10.2961/jlmn.2019.03.0003","url":null,"abstract":"","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47318654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.2961/jlmn.2019.03.0010
H. Niino, T. Sakai, Shinji Ookuma, Naoto Okada, Y. Kato, T. Kurita, T. Kawashima
Laser-induced cleaning by the elimination of liquid contaminant droplets from the surface of a solid substrate is an attractive application of laser technology. We report the laser-induced ejection of an organic carbonate liquid droplet from an aluminum surface using three different infrared (IR) laser pulse durations (5.7 ns, 35 ns, and 90 μs). Single-shot cleaning of a large area sample through a noncontact process was achieved by irradiation with a nanosecond-pulsed laser. The dynamic behavior of liquid desorption was observed with a high-speed CCD camera. The threshold laser fluences for liquid desorption by laser irradiations were determined for each of the lasers. The laser pulse duration increased with increasing threshold laser fluence.
{"title":"Laser-induced Ejection of a Millimeter-sized Liquid Droplet from a Metal Surface by IR Laser Irradiation at Three Different Pulse Durations","authors":"H. Niino, T. Sakai, Shinji Ookuma, Naoto Okada, Y. Kato, T. Kurita, T. Kawashima","doi":"10.2961/jlmn.2019.03.0010","DOIUrl":"https://doi.org/10.2961/jlmn.2019.03.0010","url":null,"abstract":"Laser-induced cleaning by the elimination of liquid contaminant droplets from the surface of a solid substrate is an attractive application of laser technology. We report the laser-induced ejection of an organic carbonate liquid droplet from an aluminum surface using three different infrared (IR) laser pulse durations (5.7 ns, 35 ns, and 90 μs). Single-shot cleaning of a large area sample through a noncontact process was achieved by irradiation with a nanosecond-pulsed laser. The dynamic behavior of liquid desorption was observed with a high-speed CCD camera. The threshold laser fluences for liquid desorption by laser irradiations were determined for each of the lasers. The laser pulse duration increased with increasing threshold laser fluence.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43764669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.2961/jlmn.2019.03.0005
{"title":"High-Speed Imaging of a Laser Ablation Process Using Parallel Phase-Shifting Interferometry","authors":"","doi":"10.2961/jlmn.2019.03.0005","DOIUrl":"https://doi.org/10.2961/jlmn.2019.03.0005","url":null,"abstract":"","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48631677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-01DOI: 10.2961/jlmn.2019.02.0008
Y. Nakajima, Keiji Yamada, K. Fukushima, Ryutaro Tanaka, K. Sekiya
Photoelastic observation was applied for the thermal stress cleaving of brittle substrates in order to experimentally investigate the stress distribution and its effects on the accuracy of crack propagation. In the laser cleaving process with a curved path, the principle stress acted on the incorrect direction near the edge of the substrate, then the crack deviated from the desired cleaving path. Additionally, high scanning speed of laser disturbed the distribution of the principal stress direction and resulted in the incline of cleaved surface. In the trimming process by laser cleaving, the straight cleaving path was bent toward the free edge of substrate due to the asymmetrical stress distribution, which was successfully observed by the proposed photoelastic method.
{"title":"Experimental Study on the Relationship between Direction of Crack Propagation and Thermal Stress Distribution in Laser Cleaving Process for Glass Substrate","authors":"Y. Nakajima, Keiji Yamada, K. Fukushima, Ryutaro Tanaka, K. Sekiya","doi":"10.2961/jlmn.2019.02.0008","DOIUrl":"https://doi.org/10.2961/jlmn.2019.02.0008","url":null,"abstract":"Photoelastic observation was applied for the thermal stress cleaving of brittle substrates in order to experimentally investigate the stress distribution and its effects on the accuracy of crack propagation. In the laser cleaving process with a curved path, the principle stress acted on the incorrect direction near the edge of the substrate, then the crack deviated from the desired cleaving path. Additionally, high scanning speed of laser disturbed the distribution of the principal stress direction and resulted in the incline of cleaved surface. In the trimming process by laser cleaving, the straight cleaving path was bent toward the free edge of substrate due to the asymmetrical stress distribution, which was successfully observed by the proposed photoelastic method.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69259389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-30DOI: 10.2961/jlmn.2019.02.0009
Norbert Ackerl, K. Wegener
Ultra-short pulsed laser manufacturing gives a unique route to ablate hard-to-machine materials and enables little thermal impact. A comparative study on an alumina-toughened zirconia (ATZ) composite and pure alumina is presented. Singleand multi-pulse ablation of 1030nm and 515nm wavelength with sub picosecond pulses reveal an abrupt increase of the material removal rate. Pockets with 5μm beam distance and 15 layers rotated by 23° are generated to attain the multi-pulse ablation rate. The threshold fluence gives 0.1J/cm2 and 0.11J/cm2 for green wavelength and the ATZ and alumina, respectively. Single pulse ablation with 7J/cm2 energy density point to the sharp ablation limit and an electron microscopy assessment reveals a step-like behavior. Subsequent Raman spectroscopy studies prove the persistence of the tetragonal morphology of zirconia. These findings enable laser manufacturing of microstructures on ceramic specimen with a 2.5D and quasi-tangential strategy.
{"title":"Ablation Characteristics of Alumina and Zirconia Ceramics on Ultra-short Pulsed Laser Machining","authors":"Norbert Ackerl, K. Wegener","doi":"10.2961/jlmn.2019.02.0009","DOIUrl":"https://doi.org/10.2961/jlmn.2019.02.0009","url":null,"abstract":"Ultra-short pulsed laser manufacturing gives a unique route to ablate hard-to-machine materials and enables little thermal impact. A comparative study on an alumina-toughened zirconia (ATZ) composite and pure alumina is presented. Singleand multi-pulse ablation of 1030nm and 515nm wavelength with sub picosecond pulses reveal an abrupt increase of the material removal rate. Pockets with 5μm beam distance and 15 layers rotated by 23° are generated to attain the multi-pulse ablation rate. The threshold fluence gives 0.1J/cm2 and 0.11J/cm2 for green wavelength and the ATZ and alumina, respectively. Single pulse ablation with 7J/cm2 energy density point to the sharp ablation limit and an electron microscopy assessment reveals a step-like behavior. Subsequent Raman spectroscopy studies prove the persistence of the tetragonal morphology of zirconia. These findings enable laser manufacturing of microstructures on ceramic specimen with a 2.5D and quasi-tangential strategy.","PeriodicalId":54788,"journal":{"name":"Journal of Laser Micro Nanoengineering","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46491014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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