scholarly journals Surface Laser Processing of Additive Manufactured 1.2709 Steel Parts: Preliminary Study

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
O. Černašėjus ◽  
J. Škamat ◽  
V. Markovič ◽  
N. Višniakov ◽  
S. Indrišiūnas
Keyword(s):  
Wear Resistance ◽  
Laser Processing ◽  
Selective Laser Sintering ◽  
Scanning Speed ◽  
Surface Conditions ◽  
Metal Parts ◽  
Processing Times ◽  
Surface Laser ◽  
Preliminary Study

Recently, metal selective laser sintering (SLS) techniques have attracted lively interest as a promising technology, which offers a number of unique applications in manufacturing of metal parts with complex internal structure and geometry. However, unsatisfactory surface properties of as-manufactured SLS parts cause high cost of finish processing and restrict wider application of SLS products. The paper presents results of the study, which was taken to evaluate capability of laser processing to improve surface quality of SLS parts manufactured from powder maraging steel 1.2709 (X3NiCoMoTi 18-9-5). The properties of processed surfaces were assessed, and the main dependencies of the roughness, hardness, wear resistance, and phase composition on the main parameters of laser processing—scanning speed, laser power, and number of processing times—were determined. The roughness of surfaces was diminished up to ∼41%, the hardness was increased up to ∼88%, and the wear resistance was improved up to almost 4 times, as compared with surface of as-manufactured SLS part. The preliminary study has demonstrated that laser processing has considerable potential for improvement of surface conditions of steel additive manufactured parts.

Effect of Laser Processing Parameters on Microhole Quality of Aluminium Nitride Ceramics

2021 ◽  
Vol 871 ◽  
pp. 277-283
Author(s):  
Chun Yan Yang ◽  
Yun Hao ◽  
Bozhe Wang ◽  
Hai Yuan ◽  
Liu Hui Li
Keyword(s):  
Laser Processing ◽  
Laser Power ◽  
Picosecond Laser ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Recast Layer ◽  
Aluminium Nitride ◽  
Obvious Effect ◽  
Nitride Ceramics

A picosecond laser in spin-cutting mode was used to drill 500μm diameter microholes on 150μm thick aluminium nitride ceramic. The effects of laser processing parameters such as the laser power, scanning speed, and defocus amount on the microhole quality were studied. The results show that as the laser power increases, the inlet and outlet diameters of the holes increase, the taper decreases slightly, and the thickness of the recast layer decreases evidently. The scanning speed has no obvious effect on the diameter and taper of the hole; however, the hole can not be drilled through when the speed is too large. Positive defocus can effectively reduce the taper of the hole. Under 28.5W laser power, 400Hz frequency, 200mm/s scanning speed, and zero defocus amount conditions, high-quality microholes with a taper of 0.85° were obtained.

Dynamical Identification Model of Laser Cladding Width in Metal Parts Laser Shaping Process

2013 ◽  
Vol 820 ◽  
pp. 216-219
Author(s):  
Shu Juan Jiang ◽  
Fei Fei Yu ◽  
Mao Zheng Fu
Keyword(s):  
Laser Cladding ◽  
Closed Loop ◽  
Scanning Speed ◽  
Step Response ◽  
Closed Loop Control ◽  
Loop Control ◽  
Simulating Experiment ◽  
Metal Parts ◽  
Shaping Process

The dynamical model of laser cladding width is identified by the method of step response experiments. Mathematical models between the cladding width and the laser power, the scanning speed, or the powder flowrate are established respectively according to corresponding experimental results. Simulating experiment results verify the validity of these models. The dynamical identification lays foundation for the closed loop control in laser shaping process so as to improve the quality of the laser formed parts.

scholarly journals Emerging trend in manufacturing of 3D biomedical components using selective laser sintering: A review

2020 ◽  
Vol 184 ◽  
pp. 01047 ◽  
Author(s):  
Pankaj Kumar ◽  
Gazanfar Mustafa Ali syed
Keyword(s):  
Mechanical Properties ◽  
Laser Processing ◽  
Laser Power ◽  
Review Paper ◽  
Selective Laser Sintering ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Sintering Process ◽  
Research Papers ◽  
Published Research

Additive manufacturing (also known as 3D printing) process is an emerging technique for the fabrication of biomedical components. Selective laser sintering or melting is one of the widely used additive printing technology for manufacturing of metallic and non-metallic components used in the industry. This review paper presents, a summary of the published research papers on the fabrication of biomedical components using selective laser sintering technique. Therefore, author meticulously attempted to investigate individual biocompatible material-wise review which includes Ti6Al4V, Ti-7.5 Mo alloy, β-Ti35Zr28Nb, PEEK, PA2200, and Polyamide/Hydroxyapatite. In addition, this article also explores the effects of the various laser sintering process parameters such as laser power, scanning speed, density of the material on the mechanical properties, tribological properties, porosity and surface roughness of the fabricated alloy. Moreover, the author also investigated challenges and future prospective of the laser processing of biomedical implants.

scholarly journals Effect of Laser Processing on Surface Properties of Additively Manufactured 18-Percent Nickel Maraging Steel Parts

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 600
Author(s):  
Olegas Černašėjus ◽  
Jelena Škamat ◽  
Vladislav Markovič ◽  
Nikolaj Višniakov ◽  
Simonas Indrišiūnas
Keyword(s):  
Wear Resistance ◽  
Maraging Steel ◽  
Laser Processing ◽  
Roughness Parameter ◽  
Pulsed Laser ◽  
Oxide Phase ◽  
Scanning Speed ◽  
Steel Part ◽  
Nanosecond Pulsed Laser ◽  
Part Surface

In the present work, the experimental study on laser processing of additively manufactured (AM) maraging steel part surface was conducted. Nanosecond pulsed laser at ablation mode was used for surface modification in oxidizing atmosphere. The morphology, roughness, elemental and phase composition, microhardness and tribological properties of the processed surfaces were investigated. The obtained results revealed that pulsed laser processing under the ablation mode in air allows obtaining modified surface with uniform micro-texture and insignificant residual undulation, providing 3 times lower roughness as compared with the as-manufactured AM part. The intensive oxidation of surface during laser processing results in formation of the significant oxides amount, which can be controlled by scanning speed. Due to the presence of the oxide phase (such as Fe2CoO4 and Ti0.11Co0.89O0.99), the hardness and wear resistance of the surface were significantly improved, up to 40% and 17 times, respectively. The strong correlation between the roughness parameter Ra and mass loss during the tribological test testifies the significant role of the obtained morphology for the wear resistance of the surface.

Sintering quality and parameters optimization of sisal fiber/PES composite fabricated by selective laser sintering (SLS)

2020 ◽  
pp. 089270572093917
Author(s):  
Aboubaker IB Idriss ◽  
Jian Li ◽  
Yanling Guo ◽  
Yangwei Wang ◽  
Xingdong Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Laser Power ◽  
Selective Laser Sintering ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Sisal Fiber ◽  
Optimum Parameters ◽  
Preheating Temperature

This article aims to improve the sintering quality of the sisal fiber/poly-(ether sulfone) (PES) composite (SFPC) part fabricated via selective laser sintering (SLS). The sisal fiber and PES powders were proposed as the feedstock of the SFPC powder bed for SLS. An orthogonal experimental methodology with four levels and five factors was applied to optimize the process parameters for the single-layer sintering experiment. The mechanical properties and accurate dimensions of the sintered part were tested using a universal testing machine and Vernier caliper. The preheating temperature, scanning speed, and laser power were selected as influencing factors on the mechanical properties and accuracy dimensions of the SFPC part. Furthermore, the influence factors on the quality of the sintered part were studied and analyzed. Additionally, the synthesis weighted scoring method was used to determine the optimum parameters of the SLS part. The results showed that the optimal parameters (factors) were preheating temperature of 82°C, scanning speed of 2 m s−1, laser power of 14 W, and laser wavelength of 10.6 μm. Thus, the quality of SFPC part was significantly enhanced when the optimum parameters were applied in SLS process. This article provided the main reference value for the choice of the process parameters of the biomass composite.

EFFECT OF LASER PROCESSING PARAMETERS ON THE COATING'S MICROSTRUCTURE AND QUALITY

2007 ◽  
Vol 14 (05) ◽  
pp. 885-890 ◽  
Author(s):  
Y. S. TIAN ◽  
D. Y. WANG ◽  
C. Z. CHEN
Keyword(s):  
Titanium Alloy ◽  
Output Power ◽  
Laser Processing ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Thickness Increase

The effect of laser processing parameters on the microstructure and quality of the coatings fabricated on titanium alloy has been investigated. Results show that the increase of the output power and the decrease of the scanning speed result in the thickness increase and the microstructure coarseness of the coatings. Overlapped fraction of the laser tracks significantly affects the coating's quality. With a lower overlapped fraction, pores and cracks easily occur in the overlapped area due to the inferior metallurgical quality.

Influence of Layer Laser Sintering on Quality of Surface Layer Sintered Aluminum Powder PA-4

2015 ◽  
Vol 770 ◽  
pp. 205-208
Author(s):  
N.A. Saprykina ◽  
A.A. Saprykin ◽  
Ivan F. Borovikov
Keyword(s):  
Surface Layer ◽  
Aluminum Powder ◽  
Laser Processing ◽  
Laser Power ◽  
Experimental Studies ◽  
Scanning Speed ◽  
Powder Layer ◽  
Sintered Aluminum ◽  
Sintered Layer

The results of experimental studies of the influence of technological regimes of laser irradiation on the thickness of the surface layer of the sintered aluminum powder PA-4. The basic mode settings that affect the quality of the sintered surface layer - laser power, scanning speed and move the laser beam powder layer. The limits of variation of the thickness of the sintered layer from 0.74 to 1.55 mm by changing the technological conditions of laser processing.

Dynamical Identification Model of Laser Cladding Height in Metal Parts Laser Shaping Process

2012 ◽  
Vol 591-593 ◽  
pp. 1050-1053 ◽  
Author(s):  
Shu Juan Jiang ◽  
Ai Zhong He
Keyword(s):  
Closed Loop ◽  
Scanning Speed ◽  
Step Response ◽  
Closed Loop Control ◽  
Forming Process ◽  
Loop Control ◽  
Metal Parts ◽  
Shaping Process ◽  
Identification Model

The metal parts laser shaping process dynamical identification is fulfilled by the method of experiment. Through step response experiments, mathematical models between the cladding height and the laser power, the scanning speed, or the powder flowrate are established respectively. Simulating experiments validate these identification models. From the identification models, the metal parts laser shaping process is understood, which is the basement for designing closed loop control in forming process and is significant to improve the quality of formed parts.

EVALUATION OF TRIBOTECHNICAL PROPERTIES OF THE COATING OBTAINED BY ELECTRIC SPARK HARDENING

2020 ◽  
Vol 4 (141) ◽  
pp. 157-163
Author(s):  
IL’YA ROMANOV ◽  
◽  
ROMAN ZADOROZHNIY
Keyword(s):  
Wear Resistance ◽  
Reference Sample ◽  
Optical Microscope ◽  
Research Purpose ◽  
Tribotechnical Properties ◽  
Uncoated Surface ◽  
Before And After ◽  
Materials Used ◽  
Friction Track

When applying coatings using various methods on the surfaces of moving parts that work in joints, it is important to make sure that the coatings are strong and wear-resistant in order to return them to their original resource. All existing hardening technologies and materials used to perform coatings have their own characteristics, therefore, the quality of the resulting coatings can be judged only after specific tests. (Research purpose) The research purpose is in evaluating the properties of the coating obtained by the method of electric spark hardening, and its ability to resist friction and mechanical wear. (Materials and methods) Authors conducted tests on the basis of the "Nano-Center" center for collective use. A coating was applied on the BIG-4M unit with a VK-8 hard alloy electrode, tribological properties were evaluated on a CSM Instruments TRB-S-DE-0000 tribometer, the width of the friction track was measured after the test using an inverted OLYMPUS gx51 optical microscope, and samples were weighed before and after the test on a VLR-200 analytical balance. Conducted research in accordance with GOST 23.224-86 and RD 50-662-88 guidelines. (Results and discussion) The article presents performed tests on the run-in and wear resistance of the coating. The samples were worked on with a step-by-step increase in the load. During the tests, the friction force was drawed on the diagram. Authors compared the results with the reference sample, an uncoated surface. (Conclusions) The resulting coating has better run-in and wear resistance compared to the standard, and the increase in wear resistance in dry friction conditions is very significant.

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