Formation of Lead Bearing Surface Layers on Aluminum Alloys by Laser Alloying

2006 ◽  
Vol 508 ◽  
pp. 99-104 ◽  
Author(s):  
Mária Svéda ◽  
András Roósz ◽  
Gábor Buza
Keyword(s):  
Solid Lubricant ◽  
Volume Fraction ◽  
Laser Surface ◽  
Surface Alloying ◽  
Bearing Surface ◽  
Surface Layers ◽  
Sliding Bearings ◽  
Laser Surface Alloying ◽  
Quantitative Image ◽  
Pin On Disc

The aim of the present work is to investigate the microstructure of Al-Pb monotectic surface layers generated by a laser surface alloying technique on the surface of an Al-4Cu-1.5Si-0.5Mg alloy. Monotectic alloys are generally used as materials for sliding bearings. Layers of a monotectic alloy generated by laser surface alloying have a potential for superior properties, because the rapid solidification during this process results in fine precipitation structures which can act as solid lubricant. The structure of the Al-Pb monotectic surface layers was observed in the light microscope and the scanning electron microscope. Volume fraction and size distribution of lead particles were determined by quantitative image analysis. Pin-on-disc experiments were carried out to characterize and compare the tribological properties of the Al-Pb monotecitc layers and cast Al-Cu-Si-Mg alloys.

scholarly journals Microstructural Evolution During Laser Surface Alloying of Ductile Cast Iron with Titanium

2017 ◽  
Vol 62 (4) ◽  
pp. 2425-2431 ◽  
Author(s):  
D. Janicki
Keyword(s):  
Cast Iron ◽  
Solidification Rate ◽  
Titanium Content ◽  
Ductile Cast Iron ◽  
Laser Surface ◽  
Surface Alloying ◽  
Surface Layers ◽  
Composite Surface ◽  
Laser Surface Alloying ◽  
Xrd Diffraction

AbstractDiode laser surface alloying process was used to the in-situ synthesis of TiC-reinforced composite surface layers on the ductile cast iron substrate. The obtained composite surface layers were investigated using optical and scanning electron microscopy, and XRD diffraction.It was found that the morphology and fraction of TiC phase is directly dependent upon both the concentration of titanium in the molten pool and also the solidification rate. With increasing titanium content, the fraction of TiC increases, whereas the fraction of cementite decreases. The TiC phase promotes a heterogeneous nucleation of primary austenite grains, what reduces a tendency of cracking in the alloyed layers.

Fabrication of TiC-Reinforced Surface Layers on Ductile Cast Iron Substrate by Laser Surface Alloying

2020 ◽  
Vol 308 ◽  
pp. 76-99 ◽  
Author(s):  
Damian Janicki
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron ◽  
Laser Surface ◽  
Surface Alloying ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Composite Surface ◽  
Laser Surface Alloying ◽  
Novel Method

This chapter presents a novel method for analysis and optimization of the in-situ formation of TiC-reinforced composite surface layers (TRL) on a ductile cast iron substrate during the laser surface alloying process, combining the experimental approach with the computational thermodynamics. The microstructure of the TRLs has been assessed by light optical microscopy, scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction. The results of thermodynamic calculations with the Scheil-Gulliver model showed a good agreement with the experimental results, indicating that the actual solidification path for the analyzed Fe-C-Si-Ti alloy systems under the investigated range of laser processing conditions is close to the Scheil-Gulliver assumption.

scholarly journals Diode Laser Surface Alloying of Armor Steel with Tungsten Carbide

2017 ◽  
Vol 62 (2) ◽  
pp. 473-481 ◽  
Author(s):  
D. Janicki ◽  
J. Górka ◽  
W. Kwaśny ◽  
K. Gołombek ◽  
M. Kondracki ◽  
...  
Keyword(s):  
Molten Pool ◽  
Structural Integrity ◽  
Laser Surface ◽  
Surface Alloying ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Laser Surface Alloying ◽  
Average Hardness ◽  
Complex Carbides ◽  
Armor Steel

AbstractMetal matrix composite (MMC) surface layers reinforced by WC were fabricated on armor steel ARMOX 500T plates via a laser surface alloying process. The microstructure of the layers was assessed by scanning electron microscopy and X-ray diffraction.The surface layers having the WC fraction up to 71 vol% and an average hardness of 1300 HV were produced. The thickness of these layers was up to 650 μm. The addition of a titanium powder in the molten pool increased the wettability of WC particles by the liquid metal in the molten pool increasing the WC fraction. Additionally, the presence of titanium resulted in the precipitation of the (Ti,W)C phase, which significantly reduced the fraction of W-rich complex carbides and improved a structural integrity of the layers.

Microstructures of Laser Processed Fe-Cr Surface Alloys

1981 ◽  
Vol 39 ◽  
pp. 328-329
Author(s):  
P. A. Molian ◽  
K. H. Khan ◽  
W. E. Wood
Keyword(s):  
Cooling Rate ◽  
Pure Iron ◽  
Continuous Wave ◽  
Laser Surface ◽  
Material Surface ◽  
Constitution Diagram ◽  
Incident Power ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
Spot Diameter

In recent years, the effects of chromium on the transformation characteristics of pure iron and the structures produced thereby have been extensively studied as a function of cooling rate. In this paper, we present TEM observations made on specimens of Fe-10% Cr and Fe-20% Cr alloys produced through laser surface alloying process with an estimated cooling rate of 8.8 x 104°C/sec. These two chromium levels were selected in order to study their phase transformation characteristics which are dissimilar in the two cases as predicted by the constitution diagram. Pure iron (C<0.01%, Si<0.01%, Mn<0.01%, S=0.003%, P=0.008%) was electrodeposited with chromium to the thicknesses of 40 and 70μm and then vacuum degassed at 400°F to remove the hydrogen formed during electroplating. Laser surface alloying of chromium into the iron substrate was then performed employing a continuous wave CO2 laser operated at an incident power of 1200 watts. The laser beam, defocussed to a spot diameter of 0.25mm, scanned the material surface at a rate of 30mm/sec, (70 ipm).

Laser surface alloying of Al and AlSi10Mg with Ti and Ni

1998 ◽  
Author(s):  
N. Pirch ◽  
G. Backes ◽  
E. W. Kreutz ◽  
X. He ◽  
A. Weisheit ◽  
...  
Keyword(s):  
Laser Surface ◽  
Surface Alloying ◽  
Laser Surface Alloying
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