scholarly journals Laser Alloying Monel 400 with Amorphous Boron to Obtain Hard Coatings

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3494 ◽  
Author(s):  
Mateusz Kuklinski ◽  
Aneta Bartkowska ◽  
Damian Przestacki
Keyword(s):  
Laser Beam ◽  
Dendritic Structure ◽  
Hard Coatings ◽  
Beam Power ◽  
Beam Scanning ◽  
Scanning Velocity ◽  
Heat Treated ◽  
Laser Beam Power ◽  
Monel 400 ◽  
Laser Beam Scanning

In this study, Monel 400 is laser heat treated and laser alloyed with boron using diode laser to obtain adequate remelting and to improve the microhardness Single laser tracks were produced on the surface with three different laser beam scanning velocities: 5, 25, and 75 m/min. In order to enrich Monel 400 with boron surfaces were covered with initial layers of two different thicknesses before the process: 100 μm and 200 μm. In all experiments, laser beam power density was equal to 178 kW/cm2. Produced laser tracks were investigated in areas of microstructure, depth of remelting and microhardness. It was found that remelted zones are mainly composed of dendrites and the more boron is present in the laser track, the dendritic structure more fragmented is. Depth of remelting and microhardness depend not only on the laser beam scanning velocity but also on thickness of the initial boron layer. While microhardness of Monel 400 is equal to approximately 160 HV0.1, microhardness up to 980 HV0.1 was obtained in areas laser alloyed with boron.

scholarly journals Influence of Microstructure and Chemical Composition on Microhardness and Wear Properties of Laser Borided Monel 400

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5757
Author(s):  
Mateusz Kukliński ◽  
Aneta Bartkowska ◽  
Damian Przestacki ◽  
Grzegorz Kinal
Keyword(s):  
Wear Resistance ◽  
Laser Beam ◽  
Wear Test ◽  
Beam Power ◽  
Iron Particles ◽  
Wear Properties ◽  
Beam Scanning ◽  
Scanning Velocity ◽  
Monel 400 ◽  
Laser Beam Scanning

In this study, wear properties of Monel 400 after laser alloying with boron are described. Surfaces were prepared by covering them with boron paste layers of two different thicknesses (100 µm and 200 μm) and re-melting using diode laser. Laser beam power density was equal to 178.3 kW/cm2. Two laser beam scanning velocities were chosen for the process: 5 m/min and 50 m/min. Surfaces alloyed with boron were investigated in terms of wear resistance, and the surface of untreated Monel 400 was examined for comparison. Wear tests were performed using counterspecimen made from steel 100Cr6 and water as a lubricant. Both quantitative and qualitative analysis of surfaces after wear test are described in this paper. Additionally, microstructures and properties of obtained laser alloyed surfaces are presented. It was found that the wear resistance increased from four to tens of times, depending on parameters of the laser boriding process. The wear mechanism was mainly adhesive for surfaces alloyed with initial boron layer 100 µm thick and evolves to abrasive with increasing boron content and laser beam scanning velocity. Iron particles detached from counterspecimens were detected on each borided surface after the wear test, and it was found that the harder the surface the less built-ups are present. Moreover, adhered iron particles oxidized during the wear test.

Impact of the Parameters of Laser-Vibration Treatment on the Roughness of Aluminium Melts

2014 ◽  
Vol 874 ◽  
pp. 71-75 ◽  
Author(s):  
Bogusław Grabas
Keyword(s):  
Laser Beam ◽  
Vibration Frequency ◽  
Laser Power ◽  
Experimental Results ◽  
Beam Scanning ◽  
Scanning Velocity ◽  
Vibration Treatment ◽  
The Mean ◽  
Laser Beam Scanning

This paper presents the preliminary, experimental results of laser-vibration treatment to increase the roughness of aluminium melts in compliance with EN AW-6060 (AlMgSi0.5). Using this method, metal objects are melted with a mobile laser beam while being vibrated. The effects of laser beam scanning velocity on the shapes of aluminium melts were studied at the set laser power and vibration frequency. The studied parameter was the mean roughness Ra. The value of Ra parameter grew significantly. The studies were undertaken to employ this technology for the purpose of intensifying the exchange of heat in aluminium heating panels.

scholarly journals The Effects of Laser Surface Modification on the Microstructure of 1.4550 Stainless Steel

2018 ◽  
Vol 237 ◽  
pp. 02009 ◽  
Author(s):  
Damian Przestacki ◽  
Aneta Bartkowska ◽  
Mateusz Kukliński ◽  
Piotr Kieruj
Keyword(s):  
Laser Beam ◽  
Cooling System ◽  
Steel Substrate ◽  
Beam Power ◽  
Beam Diameter ◽  
Laser Surface Modification ◽  
Heat Treated ◽  
Laser Beam Power ◽  
Melted Layer ◽  
Stainless Austenitic Steel

In this study a stainless austenitic steel 1.4550 was laser heat treated with diode laser. The influence a gouache coating on remelted steel substrate was carry out. The cooling system during laser melted was analysis as well. Melted layers were manufactured with different laser beam power between 0.6 kW and 1.4 kW, constant scanning laser beam speed vl = 5.76 m/min and laser beam diameter equal dl = 1.2 mm. The surface was treated at room temperature and under CO2 cooling conditions and the results were compered. With the increase of the laser beam power, the dimensions of the laser tracks increase. The depth of laser tracks varies significantly than their width. The deepest melted layer was observed for a material that wasn’t coated by any of absorbent paste and when there wasn’t cooling system.

scholarly journals Investigation of laser heat treated Monel 400

2018 ◽  
Vol 219 ◽  
pp. 02005 ◽  
Author(s):  
Mateusz Kukliński ◽  
Aneta Bartkowska ◽  
Damian Przestacki
Keyword(s):  
Laser Beam ◽  
Heat Dissipation ◽  
Beam Power ◽  
Structural Elements ◽  
Additional Material ◽  
Beam Velocity ◽  
Laser Heat ◽  
Initial Stage ◽  
Heat Treated ◽  
Laser Beam Power

In this research, Monel metal was laser heat-treated for microstructural, microhardness and roughness investigation. The treatment is an initial stage for welding Monel without additional material for structural elements. The treatment was carried out with diode laser TruDiode 3006 which allows to reach a power of 3 kW. The material was treated with a constant laser beam power, equal to 1400 W, and four different laser beam velocities: 5, 25, 50 and 75 m/min. The distance between single laser tracks was 0,5 mm in every experimental series. It was found that laser heat treatment of Monel does not influence its hardness. The depth of melted areas is decreasing with an increasing laser beam velocity. The melted area manufactured with laser beam velocity equal to 5 m/min is about 350 μm. Increasing the laser beam velocity to 75 m/min causes depth reduction to about 100 μm. The melted areas are built with column crystals oriented in the direction of heat dissipation perpendicular to the heating direction.

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