Influence Environment and Parameters Ablative Laser Texturing on Selected Properties Surface Layer Steel 100CrMnSi6-4

2014 ◽  
Vol 874 ◽  
pp. 17-22
Author(s):  
Wojciech Napadłek
Keyword(s):  
Surface Layer ◽  
Scanning Speed ◽  
Bearing Steel ◽  
Laser Hardening ◽  
Laser Texturing ◽  
Martensitic Microstructure ◽  
Bainite Microstructure ◽  
Best Parameters ◽  
Layer Steel ◽  
Ablative Laser

This paper presents results of laboratory investigation microstructure bearing steel 100CrMnSi6-4 after laser hardening in the air and cryogenic environment. Usied high-power laser CO2 (4 kW) were selected the best parameters for hardening process (power density, scanning speed, the overlap surface hardened zones). As a result, laser hardening of the surface layer steel 100CrMnSi6-4 with selected process parameters obtained highdispersing martensitic microstructure of microhardness to 900HV0.1 with isolated fragmented chromium carbides. In the heat affected zone found martensitic- bainitic and bainite microstructure. In comparison with conventional hardening (e.g. inductive) were significant microstructure fragmentation and increase hardness about 15%. This paper presents ablative laser texturing surface layer above steel hardened before by laser. Texturing process was carried out in two environments and used pulsed iterbium fiber laser radiation Nd: YAG with a wavelength λ = 1064 nm.

STEEL WEAR RESISTANCE 100CrMnSi6-4 AFTER ABLATION LASER TEXTURE

Tribologia ◽  
2017 ◽  
pp. 57-64
Author(s):  
Wojciech NAPADŁEK ◽  
Czesław PAKOWSKI ◽  
Adam WOŹNIAK
Keyword(s):  
Heat Treatment ◽  
Friction Force ◽  
Linear Method ◽  
Bearing Steel ◽  
Laboratory Model ◽  
Mechanical Processing ◽  
Laser Texturing ◽  
Conventional Heat Treatment ◽  
Ablative Laser ◽  
Ball On Disc

We analysed the results of tribological laboratory model tests, including measurements of temperature, friction force, and wear, in the model friction for samples made of 100CrMnSi6-4 steel. Measurements were made using a linear method on selected samples after conventional quenching and after laser texturing. Samples in the form of discs cooperated in combination with the cooperating element in the form of spheres made of bearing steel conventionally hardened. Top layers of samples in the form of discs were subjected to a conventional heat treatment (hardening), in order to produce micro-reservoirs in the form of spherical sphere was subjected to ablative laser micro-treatment and then conventional mechanical processing. Ablative laser micromachining was performed using Nd: YAG laser. The "ball-on-disc" method was used based on a Tribometer T-11. To lubricate of combination, we applied ŁT-43 lithium bearing grease. It was found that the best results, in terms of increasing the We analysed the results of tribological laboratory model tests, including measurements of temperature, friction force, and wear, in the model friction for samples made of 100CrMnSi6-4 steel. Measurements were made using a linear method on selected samples after conventional quenching and after laser texturing. Samples in the form of discs cooperated in combination with the cooperating element in the form of spheres made of bearing steel conventionally hardened. Top layers of samples in the form of discs were subjected to a conventional heat treatment (hardening), in order to produce micro-reservoirs in the form of spherical sphere was subjected to ablative laser micro-treatment and then conventional mechanical processing. Ablative laser micromachining was performed using Nd: YAG laser. The "ball-on-disc" method was used based on a Tribometer T-11. To lubricate of combination, we applied ŁT-43 lithium bearing grease. It was found that the best results, in terms of increasing the resistance to wear by friction, was obtained in a model combination in which samples after ablative laser texturing (degree of surface coverage micro-reservoirs approx. 5%) cooperated with conventionally hardened steel spheres.

The Use of Laser Texturing the Surface Layer to Modify the Friction Pair Pin-Bushing

2015 ◽  
Vol 220-221 ◽  
pp. 708-713
Author(s):  
Wojciech Napadłek ◽  
Adam Woźniak ◽  
Agnieszka Laber
Keyword(s):  
Surface Layer ◽  
Aluminum Alloy ◽  
Internal Combustion Engines ◽  
Friction Pair ◽  
High Dispersion ◽  
Adjacent Area ◽  
Laser Texturing ◽  
Slide Bearing ◽  
Bearing Alloy ◽  
Layer Steel

This paper presents the methodology and results of laser texturing of the surface layer steel 41Cr4, applied to the manufacture of crankshafts and selected aluminum alloy used for the production of slide bearings (bearings) for internal combustion engines. Laser treatment of the surface layer of this material was carried out using Nd: YAG laser with a wavelength of pulsed laser radiation λ-1064 nm. Application of laser ablation micromachining in sensitive zones of the crankshaft and slide bearing, mainly the surface layer of the friction pair, was aimed to formation of a suitable surface texture containing oil microchannels. Applying different parameters ablative laser micromachining (power density, repetition rate, number of pulses in the same area, the overlap area microchannels), a very interesting stereometry of the surface layer steel 41Cr4 and bearing alloy was obtained. The lubricant had characteristic microchannels, very important in the tribological process of the friction pair crankshaft – slide bearing. Laboratory metallographic tests showed the high dispersion microstructure of martensitic steel 41Cr4 in the superficial zone, melted and hardened. The transition zone was found to be of martensitic-bainitic microstructure and bainite. The microstructures are formed by ultrafast phase transformations over time crystallization of alloy Fe-Cr-C from the liquid phase (microhardness in the range of 550-680 HV0.05). The microstructures appear in the adjacent area to the lubricant microchannels produced during laser texturing. The studies of laser texturing the sliding layer of slide bearing made of aluminum alloy, destined to cooperate with tribological function pin engine crankshaft are preliminary results. The positive results: high repeatability of the process texturing regular geometric shape microchannels and ease process control. In the best version, technological preliminary tests showed the following oil microchannels dimensions: depth of about 3.2 microns, width 47 microns; it is a promising result.

Effect of nano-bainite microstructure and residual stress on friction properties of M50 bearing steel

2021 ◽  
pp. 107285
Author(s):  
X.F. Yu ◽  
Y.H. Wei ◽  
D.Y. Zheng ◽  
X.Y. Shen ◽  
Y. Su ◽  
...  
Keyword(s):  
Residual Stress ◽  
Bearing Steel ◽  
Bainite Microstructure

THE PROPERTIES OF CAST IRON SURFACE LAYERS MODIFIED BY LASER ABLATION MICROMACHINING

Tribologia ◽  
2017 ◽  
Vol 276 (6) ◽  
pp. 59-64
Author(s):  
Wojciech NAPADŁEK ◽  
Adam WOŹNIAK ◽  
Czesław PAKOWSKI
Keyword(s):  
Surface Layer ◽  
Cast Iron ◽  
Laser Micromachining ◽  
Grey Cast Iron ◽  
Linear Wear ◽  
Micro Channels ◽  
Iron Specimen ◽  
Friction Temperature ◽  
Grey Cast ◽  
Ablative Laser

The article presents the results of model laboratory tests, including the measurement of temperature, friction force, and linear wear of the surface layer of samples made of grey cast iron sliding against a steel counterpart. The surface layer of the cast iron specimen was modified using ablative laser micromachining in order to change its macro- and micro-geometry. To produce regular oil micro-reservoirs in a shape of micro-channels, an Nd: YAG laser (λ = 1064 nm, ƒ = 1 – 100 kHz, E = 50 J, P = 50W) with a special focusing system was used. Comparative studies included a grey cast iron specimen subjected to conventional mechanical machining and a specimen modified by ablative laser micromachining. 41Cr4 steel with a hardness of 50 HRC was used as a counterpart. Tribological tests were run in a pin-on-disk (T-11 tribometer) test set-up. The best results in the reduction of friction, temperature, and wear were obtained for samples with oil micro-reservoirs (made of ablative laser texturing) in a shape of micro-channels covering 5% of the entire tribological contact surface.

Laser hardening of AISI 52100 bearing steel with a discrete fiber laser spot

2014 ◽  
Author(s):  
Donato Sorgente ◽  
Ottavio Corizzo ◽  
Antonio Ancona ◽  
Leonardo D. Scintilla ◽  
Gianfranco Palumbo ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Bearing Steel ◽  
Laser Hardening ◽  
Laser Spot ◽  
Aisi 52100 ◽  
Discrete Fiber

Stability of the surface layer of bearing steel ShKh15

1975 ◽  
Vol 17 (6) ◽  
pp. 532-534
Author(s):  
A. G. Ran'kova ◽  
V. S. Kortov ◽  
M. L. Khenkin ◽  
A. I. Gaprindashvili ◽  
G. M. Guseva
Keyword(s):  
Surface Layer ◽  
Bearing Steel ◽  
Steel Shkh15

Residual durability of the surface layer of ShKh15 bearing steel

1996 ◽  
Vol 31 (2) ◽  
pp. 192-199 ◽  
Author(s):  
O. P. Datsyshyn ◽  
H. P. Marchenko ◽  
O. D. Zynyuk ◽  
P. M. Hrytsyshyn
Keyword(s):  
Surface Layer ◽  
Bearing Steel

THE APPLICATION OF LASER TEXTURING IN SURFACE LAYER PATTERNING OF THE COMBUSTION ENGINES ELEMENTS

2015 ◽  
Vol 22 (1) ◽  
pp. 235-242
Author(s):  
Wojciech Napadłek ◽  
Adam Woźniak ◽  
Wojciech Chrzanowski
Keyword(s):  
Surface Layer ◽  
Combustion Engines ◽  
Laser Texturing

scholarly journals CHANGES IN THE SURFACE LAYER OF ROLLED BEARING STEEL

2015 ◽  
Vol 55 (5) ◽  
pp. 347 ◽  
Author(s):  
Oskar Zemčík ◽  
Josef Sedlák ◽  
Josef Chladil
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Finite Element ◽  
Surface Layer ◽  
Finite Element Methods ◽  
Bearing Steel ◽  
Suitable Method ◽  
Roller Burnishing ◽  
Additional Operation

<p>This paper describes changes observed in bearing steel due to roller burnishing. Hydrostatic roller burnishing was selected as the most suitable method for performing roller burnishing on hardened bearing steel. The hydrostatic roller burnishing operation was applied as an additional operation after standard finishing operations. All tests were performed on samples of 100Cr6 material (EN 10132-4), and changes in the surface layer of the workpiece were then evaluated. Several simulations using finite element methods were used to obtain the best possible default parameters for the tests. The residual stress and the plastic deformation during roller burnishing were major parameters that were tested.</p>

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