The evaluation of the influence of laser treatment parameters on the type of thermal effects in the surface layer microstructure of gray irons

2016 ◽  
Vol 76 ◽  
pp. 143-148 ◽  
Author(s):  
Marta Paczkowska
Keyword(s):  
Surface Layer ◽  
Laser Treatment ◽  
Thermal Effects

X-ray analysis of mechanical and thermal effects induced by femtosecond laser treatment of aluminum single crystals

2006 ◽  
Vol 252 (13) ◽  
pp. 4691-4695 ◽  
Author(s):  
S. Valette ◽  
R. Le Harzic ◽  
E. Audouard ◽  
N. Huot ◽  
R. Fillit ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Crystals ◽  
Laser Treatment ◽  
Thermal Effects ◽  
X Ray

scholarly journals The Possibility Of Use Of Laser-Modified Ti6Al4V Alloy In Friction Pairs In Endoprostheses

2015 ◽  
Vol 60 (2) ◽  
pp. 755-758 ◽  
Author(s):  
B. Majkowska ◽  
M. Jażdżewska ◽  
E. Wołowiec ◽  
W. Piekoszewski ◽  
L. Klimek ◽  
...  
Keyword(s):  
Surface Layer ◽  
Simulated Body Fluid ◽  
Residual Stresses ◽  
Laser Treatment ◽  
Body Fluid ◽  
Ti6al4v Alloy ◽  
Surface Cracking ◽  
Modification Process ◽  
Orthopedic Applications ◽  
Cryogenic Conditions

Abstract The purpose of this paper is to show results of laser treatment at cryogenic conditions of the Ti6Al4V alloy used for orthopedic applications. That modification process ought to bring beneficial changes of microstructure and residual stresses in the surface layer. The paper presents the abrasive wear of the base and laser remelted material in association with ceramics Al2O3. Despite the surface cracking after laser treatment the tribological properties in simulated body fluid have been substantially improved.

scholarly journals Исследование механизма наноструктурирования приповерхностных слоев титана при воздействии лазерными импульсами наносекундной длительности

2021 ◽  
Vol 47 (3) ◽  
pp. 40
Author(s):  
А.Ю. Токмачева-Колобова
Keyword(s):  
Surface Layer ◽  
Dynamic Recrystallization ◽  
Laser Treatment ◽  
Power Density ◽  
Water Layer ◽  
Surface Layers ◽  
Near Surface ◽  
Physical Mechanisms ◽  
Nanosecond Pulses ◽  
Irradiation Power

The microstructure of near-surface layers of submicrocrystalline (SMC) technical titanium brand VT1-0 after laser treatment under the water layer with nanosecond pulses with an irradiation power density of F=2 GW/cm2 was studied. The effect of significant reduction of the initial SMC structure to a nanostructured state in a thin near-surface layer with a thickness of about 1 µm was found. The possibility of implementing physical mechanisms of nanostructuring of near-surface layers associated with phase recrystallization or rotational dynamic recrystallization is considered.

Influence of Thermal Effects Produced by Laser Treatment on the Tribological Behavior of Porcelain Ceramic Tiles

2009 ◽  
Vol 423 ◽  
pp. 41-46 ◽  
Author(s):  
F. Gutiérrez Mora ◽  
Arturo Domínguez-Rodríguez ◽  
V.V. Lennikov ◽  
G.F. de la Fuente
Keyword(s):  
Experimental Data ◽  
Wear Rate ◽  
Laser Treatment ◽  
Thermal Effects ◽  
Tribological Behavior ◽  
Fracture Propagation ◽  
Ceramic Tiles ◽  
Severe Wear

Commercial porcelain ceramic tiles have been irradiated with a laser to evaluate the thermal effects on their surface and in their tribological behavior. Different irradiation patterns were followed, varying the density of points where the laser was focused, from 25 to 150 dots per inch. Hardness and toughness were evaluated using Vickers indentations. Tribological behavior was studied using a ball-on-flat apparatus with alumina balls. An increase in the wear rate was observed in the higher irradiated samples, which can be correlated to a decrease in their toughness. A mechanism of severe wear by fracture propagation and material pullout is proposed to explain the experimental data and the observed corresponding microstucture.

Hardness of the Powder Coating PG-CP4 Applied to Steel 40H13 and Subjected Laser Treatment

2021 ◽  
Vol 410 ◽  
pp. 456-462
Author(s):  
Vladimir G. Gusev ◽  
Valentin V. Morozov ◽  
Dmitry I. Gavrilov
Keyword(s):  
Surface Layer ◽  
Laser Beam ◽  
Laser Treatment ◽  
Protective Coating ◽  
Factor Model ◽  
Radiation Power ◽  
Heat Removal ◽  
Powder Coating ◽  
High Rate ◽  
Laser Head

The article examines the hardness of the coating made of PG-CP4 powder. Plasma powder deposition was performed to samples made of 40H13 steel and then the samples treated with a laser beam. A multi-factor model was established that relates the hardness of the protective coating to the radiation power W, the longitudinal feed Spr of the laser beam, and the distance L from the protective casing of the laser head to the treated surface. Depending on the laser treatment modes, coating was in a state of complete, partial reflow or its absence. Full reflow is characterized by the adhesion of the filler material to the substrate, by maximum hardness of HRC 51.2–56.6 and no defects. In the absence of reflow, gas sinks, transverse microcracks, detachments, and other defects were found in the coating material, and the hardness decreased to HB 125–212. An increase in W and a decrease in Spr lead to increases the hardness of the treated coating, which is explained by an increase in the specific heat flux supplied to the coating per unit time, and a high rate of heat removal deep into the surface layer of 40H13 steel. The thickness of the surface layer with increased hardness ranged from 0.1 to 1.5 mm. Based on the multi-factor model, laser processing modes are controlled to ensure the required values of the protective coating hardness. The research results are recommended for use in enterprises that implement laser technologies and develop modern laser systems.

Increasing the Intensity of Cementation Process of Tool Low-Alloy Steels by Surface Laser Treatment

2016 ◽  
Vol 870 ◽  
pp. 377-382 ◽  
Author(s):  
E. Marinin ◽  
S.P. Grachev ◽  
A.L. Flaxman
Keyword(s):  
Surface Layer ◽  
Laser Treatment ◽  
Laser Emission ◽  
Low Alloy Steels ◽  
Test Results ◽  
Emission Power ◽  
Microstructure Formation ◽  
Alloy Tool ◽  
Alloy Steels ◽  
Surface Laser

This work considers the questions of low-alloy tool steel cementation by laser treatment. The model of surface layer carbon saturation from the laser-induced plasma is shown. It is described that the diffusion process in the laser treatment can not be explained only by the influence of temperature gradient. The results of the experimental work confirmed the increasing intensity of the process surface layer saturation with carbon. The work describes the influence of the laser emission power on surface layer microstructure formation. The test results of the hardened samples showed an approximately two-time increase in durability.

scholarly journals Strengthening of the Restored Surface Layer of Steel Parts 45 by Laser Boring

2018 ◽  
Vol 7 (4.3) ◽  
pp. 71
Author(s):  
Oleg Cherneta ◽  
Vadim Kubich ◽  
Roman Voloshchuk ◽  
Vladimir Averyanov ◽  
Dmytro Shmatko ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Laser Treatment ◽  
Complex Structure ◽  
Pulsed Laser ◽  
Thin Layers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Processing Zone ◽  
The Relationship

By means of the proposed technologies, the relationship and strengthening of the optimal modes of recovery of the restoring layer and the optimal laser treatment modes with bat-retaining straps are chosen. The microstructural, X-ray diffraction studies of the restored surfaces of the cams of the distributing shaft of the car were determined, the wear resistance and microhardness of the working surfaces were determined. By means of the proposed technologies of restoration and strengthening, optimum modes of applying the restoring layer and optimal modes of laser treatment (pumping energy of 20 kJ without melting of the surface) with bat-retaining coatings (thickness 2 mm) were chosen. The unevenness of the pulsed laser treatment with the restriction of the diameter of the laser spot and the treatment of a boron-rich surface layer with overlapping of the corresponding zones leads not only to the quenching but also to the release of individual local microparticles. New phases such as boron carbide, carbides - borides, iron borides, and others are formed. The strengthened surface layer has a complex structure and generally contains a martensite base with thin layers of borides, сarbides. The microhardness of the processing zone rises 3-4 times (Нμ 6500-7000 MPa).  

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