Surface hardening and finishing of metallic products by hybrid laserultrasonic treatment
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 1, Issue 12
Abstract
<p>Theoretical and experimental study of the possibilities of using laser heat treatment (LHT) combined with ultrasonic impact treatment (UIT) for surface hardening and finishing of metallic products was carried out. The austenization temperature range (1,050...1,350 °C) at different speeds (50...150 mm/min) of LHT without surface melting by the scanning laser beam, as well as the beginning (~360 °C) and end (~245 °C) temperatures of the martensitic transformation during the specimen cooling were determined. As a result, it allows narrowing the range of optimum LHT regimes, providing the surface hardness of 800...1,000 HV and the hardening depth of 200...400 μm of the surface layer. Experimental studies have confirmed that the determined magnitude of temperature on the specimen surface of AISI 1045 steel correlates well with the heating temperature measured by the laser pyrometer. As a consequence, this provides the ability to determine the application distance of the ultrasonic tool during cooling in the laser surface hardening of metallic surfaces.</p>The comparative analysis of the microhardness of the surface layer and the surface roughness of the samples treated by LHT, UIT, combined and hybrid laser-ultrasonic treatment was carried out. It was found that the hybrid laser-ultrasonic treatment allowed increasing the microhardness of surface layers more than 3 times and reducing the roughness parameter Ra approximately 3 times compared to the initial state, provided favorable conditions to trap oil on the product surface. Thus, there are reasons to assert the possibility of using the hybrid LHT+UIT for surface hardening and finishing of the large-sized products that work in extreme conditions
Authors and Affiliations
Vitaliy Dzhemelinskyi, Dmytro Lesyk, Olexiy Goncharuk, Oleksandr Dаnyleikо
Keywords
Related Articles
- EP ID EP527836
- DOI 10.15587/1729-4061.2018.124031
- Views 66
- Downloads 0
Recurrent network as a tool for calibration in automated systems and interactive simulators
<p>We have constructed a method for the auto-calibration and correction of values of the vector of magnetic induction, which is suitable for use under conditions of limited computational resources in microcontrollers and...
Analysis of energy of internal waves in a threelayer semiinfinite hydrodynamic system
<p class="a">Energy characteristics of waves propagation along the contact surfaces in a hydrodynamics system "liquid half-space – layer –layer with a rigid lid" are explored. Based on the solutions of first approximatio...
Improvement of the structure of floating docks based on the study into the stresseddeformed state of pontoon
<p>We have investigated the stressed-deformed state of reinforced concrete slabs of the composite dock pontoon with a reduced number of framing sets. A refined estimation scheme was applied in the calculation of bending...
Analysis of correlation dimensionality of the state of a gas medium at early ignition of materials
<span lang="EN-US">We have considered the application of the method of nonlinear dynamic systems in order to analyze and detect the structural patterns in the dynamics of increments in the state of a gas medium generated...
Managing a greenhouse complex using the synergetic approach and neural networks
<p>The paper considers the use of artificial neural networks in order to synthesize intelligent systems governed by a synergetic control law. It has been shown that so far all the studied objects and, therefore, control...