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.

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.

The effect of CaF2 and BaF2 solid lubricants on wear resistance of laserborided 100CrMnSi6-4 bearing steel

2017 ◽  
Vol 1 (86) ◽  
pp. 15-23
Author(s):  
A. Piasecki ◽  
M. Kotkowiak ◽  
M. Kulka
Keyword(s):  
Wear Resistance ◽  
Laser Beam ◽  
Wear Test ◽  
Solid Lubricants ◽  
Bearing Steel ◽  
Wear Behaviour ◽  
Beam Power ◽  
Dry Sliding Wear ◽  
Laser Alloying ◽  
X Ray

Purpose: In this paper, laser alloying with boron and solid lubricants was used in order to produce the self-lubricating layer on 100CrMnSi6-4 bearing steel. The influence of CaF2 and BaF2 on microstructure, hardness, chemical and phase composition as well as wear resistance of the layers was studied. Design/methodology/approach: The two-step process was used during laser alloying. First, the surface of the specimen was coated by a paste with alloying material. The alloying material consisted of the mixture of amorphous boron and self-lubricating additions (CaF2 and BaF2). Next, the surface was re-melted by a laser beam using TRUMPF TLF 2600 Turbo CO2 laser. The laser beam power 1.43 kW was used for laser alloying. The layer was characterized using X-ray diffraction, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, microhardness tester. The dry sliding wear behaviour of the layer was investigated using the Amsler type wear test. Findings: The tribofilm, consisting of solid lubricants, was observed on the worn surfaces of laser-alloyed layers. It caused an increase in the wear resistance at room temperature. The presence of calcium fluoride and barium fluoride was confirmed in laser-alloyed layers using XRD and X-ray microanalysis by EDS method. Practical implications: Laser surface modification with solid lubricants had the important cognitive significance and gives grounds to the practical employment of this technology for reducing the abrasive wear. Originality/value: The wear mechanism of surface layer with solid lubricants was determined. The produced layer with laser alloying layers of boron and solid lubricant (CaF2 or BaF2) was compared.

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 High-Q MEMS Resonators for Laser Beam Scanning Displays

Micromachines ◽  
2012 ◽  
Vol 3 (2) ◽  
pp. 509-528 ◽  
Author(s):  
Ulrich Hofmann ◽  
Joachim Janes ◽  
Hans-Joachim Quenzer
Keyword(s):  
Laser Beam ◽  
Beam Scanning ◽  
High Q ◽  
Mems Resonators ◽  
Laser Beam Scanning

Rapid annealing of Au thin films by micron chevron-shaped laser beam scanning toward growth of single-grain crystal

2021 ◽  
Vol 60 (SB) ◽  
pp. SBBK06
Author(s):  
Anh Hoang Pham ◽  
Naruki Fukunaga ◽  
Wenchang Yeh ◽  
Shigekazu Morito ◽  
Takuya Ohba
Keyword(s):  
Thin Films ◽  
Laser Beam ◽  
Beam Scanning ◽  
Rapid Annealing ◽  
Single Grain ◽  
Au Thin Films ◽  
Laser Beam Scanning

Hydrodynamical processes at the glass surface by laser beam scanning

1997 ◽  
Author(s):  
Vadim P. Veiko ◽  
Evgeny B. Yakovlev ◽  
E. A. Shahno
Keyword(s):  
Laser Beam ◽  
Glass Surface ◽  
Beam Scanning ◽  
Laser Beam Scanning
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