HPDL Laser Alloying of Al-Si-Cu Alloy with ZrO2 Powder

2014 ◽  
Vol 1036 ◽  
pp. 434-439 ◽  
Author(s):  
Krzysztof Labisz ◽  
Tomasz Tański ◽  
Beata Krupińska ◽  
Mariusz Krupiński ◽  
Wojciech Pakieła
Keyword(s):  
Surface Layer ◽  
Laser Treatment ◽  
Diode Laser ◽  
High Power ◽  
Aluminium Alloys ◽  
Laser Power ◽  
Ceramic Powder ◽  
Heat Treated ◽  
Power Diode ◽  
High Power Diode Laser

The purpose of this paper was the investigation of laser treatment influence on the microstructure and properties of the surface layer of heat treated Al-Si-Cu cast aluminium alloys, using the high power diode laser (HPDL). The performed laser treatment involves remelting and feeding of ZrO2 ceramic powder into the aluminium surface. Based on the performed investigations it was possible to obtain the layer consisting of the heat affected zone, transition zone and remelted zone, without cracks and defects as well as has with a slightly higher hardness value compared to the non remelted material. The laser power range was chose as 1.5 to 2.0 kW and implicated by one process speed rate of 0.25 m/min. Also a powder size was used for alloying with the particle size of ca. 100 μm. The hardness value increases according to the laser power used so that the highest power applied gives to highest hardness value in the remelted layer [1-8]. The carried out investigations allow to conclude, that as a result of alloying of the heat-treated cast aluminium alloys with oxide ceramic powder the surface layer can be enriched with the powder particle and in some cases a high-quality top layer is possible to obtain. Very often to determine conditions of laser treatment are being used the numerical methods that would significantly shorten the time to find the most optimal parameters. [8]. Concerning original practical implications of this work there was important to investigate the appliance possibility of High Power Diode Laser (HPDL) for enhancement of the aluminium surface properties, especially the wear resistance and hardness. the scientific reason was also to describe structure changes and processes occurred in the laser remelted surface aluminium layer after ZrO2 feeding using HPDL laser [10-1. .

Laser Surface Treatment of Cast Aluminium-Silicon Alloys

2018 ◽  
Vol 275 ◽  
pp. 30-40
Author(s):  
Krzysztof Labisz ◽  
Tomasz Tański
Keyword(s):  
Surface Layer ◽  
Laser Treatment ◽  
Diode Laser ◽  
High Power ◽  
Laser Power ◽  
Ceramic Powder ◽  
Surface Hardness ◽  
Cast Aluminium ◽  
Power Diode ◽  
High Power Diode Laser

The reason of performing the investigations carried out in this work was to investigate the microstructure of the laser treated Al-Si-Cu cast aluminium alloy with the ceramic powder particles using High Power Diode Laser (HPDL) for remelting, and/or alloying. First of all the feeding and distribution of the powder in the surface layer of the alloyed and remelted AlSi7Cu material. Very important issue is the determination of the laser treatment parameters, especially the powder feeding rate, laser power, and scan rate to achieve an enhancement of the layer hardness for ensuring this cast aluminium alloy from losing their working properties and to achieve the tool surface is more resistant to wear. The purpose of this work was also to determine technological and technical conditions comparison for the Al2O3 and SiC ceramic powder alloyed into the surface layer with High Power Diode Laser. There are presented also the investigation results about the determination of proper technical condition during the laser treatment, especially the laser head distance and shielding gas influence. The presented results concerns first of all the structure investigation of the obtained surface layer allowing it to achieve an enhanced hardness and wear resistance more resistant for work, special attention was devoted to monitoring of the layer morphology of the investigated material and on the particle occurred. Light (LM) and scanning electron microscopy (SEM) were used to characterize the microstructure of the obtained surface zones - the remelted zone (RZ) and heat affected zone (HAZ), the ceramic powder distribution and intermetallic phases occurred. A wide range of laser power values was applied and implicated with different laser scan rates. The powders in form of ceramic powders used for alloying were chosen with the particle size of ca. 60μm. This study was conducted to investigate the influence carbide and oxide powder addition on structure and mechanical properties as well the and structure changes occurred during the rapid solidification process. The investigation ensures to use laser treatment for alloying/feeding of ceramic powder particles into the surface of light alloys. The scientific reason of this work is the applying of High Power Diode Laser (HPDL) for improvement of aluminium`s mechanical properties, especially the surface hardness. As the main findings was determined that the obtained surface layer is homogeny without cracks and has a comparably higher hardness value compared to non-treated material. The surface hardness increases together with the applied laser power, the highest power applied gives the highest hardness value for the surface. Also the distribution of the ceramic particles is proper, but there a need for further modelling, because the hardness increases in general according to the laser power used so that the highest power applied gives to highest hardness value in the remelted layer, but for other powder amount or alloy the values should be determined separately, and more data would be necessary to create a model for the technique appliance. The practical purpose of this work is to analysis the impact and application possibility of HPDL laser surface treatment on the cast Al-Si-Cu alloys to deliver application possibilities for diverse branches of industry.

scholarly journals Formation of Hard Composite Layer on Tool Steel by Laser Alloying

2016 ◽  
Vol 61 (2) ◽  
pp. 719-724 ◽  
Author(s):  
M. Bonek
Keyword(s):  
Surface Layer ◽  
Abrasive Wear ◽  
Laser Treatment ◽  
Diode Laser ◽  
High Power ◽  
Structure Refinement ◽  
Composite Layer ◽  
Surface Layers ◽  
Power Diode ◽  
High Power Diode Laser

Abstract Investigations include alloying the PMHSS6-5-3 steel surface layer with carbide and ceramic powders WC, VC, TiC, SiC, Si3N4 and Al2O3, using the high power diode laser (HPDL). Laser treatment is especially promising for solving contemporary surface engineering problems making it possible to focus precisely the delivered energy in the form of heat in the surface layer. The structural mechanism was determined of surface layers development, effect was studied of alloying parameters, method on structure refinement and influence of these factors on the mechanical properties of surface layer, and especially on its abrasive wear resistance. The fine grained martensite structure is responsible for hardness increase of the alloyed layer. The tribological wear relationships were determined for laser treated surface layers, determining friction coefficient, and wear trace shape developed due to the abrasive wear of the investigated surfaces. Comparison of the laser treatment parameters and tribological properties of surface layer after remelting and alloying with hard particles of the PMHSS6-5-3 steel using the high power diode laser to obtain the optimum service properties is the outcome of the investigations carried out.

Laser Alloying with WC Ceramic Powder in Hot Work Tool Steel Using a High Power Diode Laser (HPDL)

2006 ◽  
Vol 15-17 ◽  
pp. 193-198 ◽  
Author(s):  
Marek Piec ◽  
Leszek Adam Dobrzański ◽  
Krzysztof Labisz ◽  
Ewa Jonda ◽  
Andrzej Klimpel
Keyword(s):  
Surface Layer ◽  
Tungsten Carbide ◽  
Diode Laser ◽  
Tool Steel ◽  
High Power ◽  
Feed Rate ◽  
Powder Feed Rate ◽  
Powder Feed ◽  
Power Diode ◽  
High Power Diode Laser

Investigations include alloying the X38CrMoV5-3 hot-work tool steel surface layer with the tungsten carbide, using the high power diode laser (HPDL). The tungsten carbide ceramic particles of the medium grain size according to FSSS = 50 /m were introduced using the rotor conveyer to improve the properties of the surface layer. The powder feed rate was set at the steady level of 8.64g/min. Remelting and alloying were carried out several times in the laser power range of 1.2 – 2.3 kW in the remelting/alloying, alloying/remelting sequences. The structural mechanism was determined of gradient layer development, effect was studied of alloying parameters, gas protection method, and powder feed rate on its mechanical properties, and especially on its hardness, abrasive wear resistance, and roughness. Structure changes were revealed consisting, in particular, in its refining, and also hardness and microhardness changes in comparizon to the nonremelted steel. Examination results obtained with the EDX microanalysis, surface and linear analysis of the chemical composition, as well as the X-ray qualitative phase analysis are presented.

Structure and Properties of Gradient Layers Using High Power Diode Laser

2006 ◽  
Vol 530-531 ◽  
pp. 269-274
Author(s):  
Leszek Adam Dobrzański ◽  
Marek Piec ◽  
Zuzanka Trojanová ◽  
Józef Lelątko ◽  
Andrzej Klimpel
Keyword(s):  
Surface Layer ◽  
Tungsten Carbide ◽  
Diode Laser ◽  
High Power ◽  
Feed Rate ◽  
Powder Feed Rate ◽  
Powder Feed ◽  
Protection Method ◽  
Power Diode ◽  
High Power Diode Laser

Investigations include alloying the X38CrMoV5-3 hot-work tool steel surface layer with the tungsten carbide, using the high power diode laser (HPDL). The tungsten carbide ceramic particles of the medium grain size according to FSSS = 50 Bm were introduced using the rotor conveyer to improve the properties of the surface layer. The powder feed rate was set at the steady level of 8.64g/min. Remelting and alloying were carried out several times in the laser power range of 1.2 – 2.3 kW in the remelting/alloying, alloying/remelting sequences. The structural mechanism was determined of gradient layer development, effect was studied of alloying parameters, gas protection method, and powder feed rate on its mechanical properties, and especially on its hardness, abrasive wear resistance, and roughness. Structure changes were revealed consisting, in particular, in its refining, and also hardness and microhardness changes in comparison to the non-remelted steel. Examination results obtained with the EDX microanalysis, surface and linear analyses of the chemical composition, as well as the X-ray qualitative phase analysis are presented.

scholarly journals The Effect of Laser Surface Treatment on Structure and Mechanical Properties Aluminium Alloy ENAC-AlMg9

2016 ◽  
Vol 61 (3) ◽  
pp. 1343-1350 ◽  
Author(s):  
W. Pakieła ◽  
L.A. Dobrzański ◽  
K. Labisz ◽  
T. Tański ◽  
K. Basa ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Tungsten Carbide ◽  
Aluminium Alloy ◽  
Diode Laser ◽  
High Power ◽  
Ceramic Powder ◽  
Laser Surface ◽  
Laser Surface Treatment ◽  
Power Diode ◽  
High Power Diode Laser

Abstract In this work, the influence of a high power diode laser surface treatment on the structure and properties of aluminium alloy has been determined. The aim of this study was to improve the mechanical and tribological properties of the surface layer of the aluminium alloy by simultaneously melting and feeding tungsten carbide particles into the molten pool. During the process was used high-power diode laser HPDL. In order to remelt the aluminium alloy surface the HPDL laser of 1.8, 2.0 and 2.2 kW laser beam power has been used. The linear laser scan rate of the beam was set 0.5 cm/s. In order to protect the liquid metal during laser treatment was used argon. As a base material was used aluminium alloy ENAC-AlMg9. To improve the surface mechanical and wear properties of the applied aluminium alloy was used biphasic tungsten carbide WC/W2C. The size of alloying powder was in the range 110-210 µm. The ceramic powder was introduced in the remelting zone by a gravity feeder at a constant rate of 8 g/m.

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