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

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.

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

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>

scholarly journals Surface Integrity of AISI 52100 Bearing Steel after Robot-Based Machine Hammer Peening

2020 ◽  
Vol 4 (2) ◽  
pp. 61
Author(s):  
Robby Mannens ◽  
Lars Uhlmann ◽  
Felix Lambers ◽  
Andreas Feuerhack ◽  
Thomas Bergs
Keyword(s):  
Surface Layer ◽  
Surface Integrity ◽  
Bearing Steel ◽  
Forming Process ◽  
Premature Failure ◽  
Machine Hammer Peening ◽  
Aisi 52100 ◽  
Aisi 52100 Steel ◽  
Hardness Increase ◽  
Hammer Peening

AISI 52100 steel is often used as material for highly loaded rolling bearings in machine tools. An improved surface integrity, which can be achieved by means of mechanical surface layer finishing, can avoid premature failure. One of these finishing processes is machine hammer peening (MHP) which is a high-frequency incremental forming process and mostly used on machining centers. However, the influence of robot-guided MHP processing on the surface integrity of AISI 52100 steel is still unknown. Therefore, the objective of this work is to investigate experimentally the robot-based influences during MHP processing and the resulting surface integrity of unhardened AISI 52100 steel. The results show that the axial and lateral deviations of the robot due to process vibrations are in the lower µm range, thus enabling stable and reproducible MHP processing. By selecting suitable MHP process parameters and thus defined contact energies, even ground surfaces can be further smoothed and a hardness increase of 75% in the energy range considered can be achieved. In addition, compressive residual stress maxima of 950 MPa below the surface and a grain size reduction to a surface layer depth of 150 µm can be realized.

Analysis of Tribological Processes in Components of Massive Roller Bearings

2015 ◽  
Vol 220-221 ◽  
pp. 319-323
Author(s):  
Wojciech Napadłek
Keyword(s):  
Surface Layer ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Contact Surface ◽  
Laboratory Tests ◽  
Fiber Optic ◽  
Bearing Steel ◽  
Roller Bearings ◽  
Special Software ◽  
Scanning Electron

The paper presents an analysis of tribological processes on the surface layer of large roller bearings parts carried out on bearing steel 100CrMn6. Laboratory tests carried out on roller bearings elements eg. the axle railway wagons exploitation around 600 thousand km. Modern optical microscopy with fiber optic transmission and special software was used; scanning electron microscope was applied to analyze surface stereometry; profilometers made an analyze of seizure of co-working tribological parts: roller – race roller bearings. In addition, the documentation of characteristic tribological processes occurring during the exploitation the bearings was completed. Seizure zones contact surface which occur under high and variable loads and friction were found.

Elasticity Modulus and Hardness of Bearing Steel after Laser Treatment

2021 ◽  
Vol 887 ◽  
pp. 247-253
Author(s):  
V. Morozov ◽  
V.G. Gusev ◽  
D. Gavrilov
Keyword(s):  
Surface Layer ◽  
Elastic Modulus ◽  
Laser Treatment ◽  
Elasticity Modulus ◽  
Bearing Steel ◽  
Workpiece Surface ◽  
Processing Mode ◽  
Laser Technologies ◽  
Laser Equipment ◽  
Layer Increase

The article considers the effect of laser treatment of bearing steel on the change in the elasticity modulus and hardness of the steel SHH15SG. Multi-factor models were obtained that relate the output parameters to the power W of laser radiation, the longitudinal feed Spr of the laser beam and the distance L from the protective glass of the focusing head to the workpiece surface. According to the degree of reduction of the influence on the elastic modulus of steel SHH15SG subjected to laser treatment, these factors are arranged in a sequence: W, Spr, and L. With increasing W and L the modulus of elasticity and hardness of the treated surface layer increase. 3M-XYZ surface-graphs, 3M-XYZ contour-graphs of interactive influence of independent factors on the elastic modulus and hardness of the surface layer are constructed, which simplifies the procedure for assigning the processing mode. The research results are useful for manufacturing and design companies that implement laser technologies and create laser equipment.

scholarly journals Analysis of Selected Properties 100CrMnSi6-4 Surface Layer after Laser Micro-Smelting

2017 ◽  
Vol 62 (2) ◽  
pp. 757-762 ◽  
Author(s):  
W. Napadłek
Keyword(s):  
Surface Layer ◽  
Surface Texturing ◽  
Bearing Steel ◽  
Laser Surface Texturing ◽  
Laboratory Studies ◽  
Rolling Bearings ◽  
Surface Textures ◽  
Study Results ◽  
Bearing Raceway ◽  
Technological Opportunities

AbstractThe use of laser ablation phenomenon with the “thermal effect” to produce surface textures, mainly lubricant micro-containers in the form of spherical micro-bowls in the surface layer of 100CrMnSi6-4 alloy of bearing steel. This is interesting research topic. The application the local (zonal) laser hardening of the steel surface layer on the surface of the bearing raceway or casts gives technological opportunities to deploy those technologies in the production process. The article presents the selected results of the own laboratory studies of hardness, microstructure and surface stereometry bearing steel 100CrMnSi6-4 in different states after volume hardening and low tempering, as well as those obtained as a result of laser surface texturing and laser pulsed hardening. The study results can be used to modify the surface layer of 100CrMnSi6-4 bearing steel and in the nearest future use ablative laser texturing of the rolling bearings treadmill surface in the production of lubricanting micro-containers, for improving the wear resistance tribological pair of roller – raceway in the friction conditions.

Effect of Laser Assistance Machining on Residual Stress and Fatigue Strength for a Bearing Steel (100Cr6) and a Titanium Alloy (Ti 6Al 4V)

2006 ◽  
Vol 524-525 ◽  
pp. 569-574 ◽  
Author(s):  
Guenael Germain ◽  
Franck Morel ◽  
Jean Lu Lebrun ◽  
Anne Morel ◽  
Bertrand Huneau
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Surface Layer ◽  
Fatigue Strength ◽  
High Strength ◽  
Cutting Parameters ◽  
Bearing Steel ◽  
Slight Reduction ◽  
Residual Stress State ◽  
Titanium Alloy Ti6al4v

The use of Laser Assisted Machining (LAM) can improve different aspects of the machinability of high strength materials. A study was undertaken to determine the optimum cutting parameters and to quantify their influence on fatigue strength according to the type of microstructure created. Two different materials were studied: a bearing steel (100Cr6 / AISI 52100) and an aeronautical titanium alloy (Ti6Al4V). In the bearing steel a significant increase of the fatigue resistance was observed due to the transformation of the surface layer into martensite. For the titanium alloy, a slight reduction in the fatigue strength was found as in this case the microstructure and residual stress state of the surface layer was less beneficial. The surface roughness has also been measured and no significant variation has been observed for different laser powers in each material.

The oxidation of Inconel alloy MA754 at low oxidation potential

1983 ◽  
Vol 41 ◽  
pp. 218-219
Author(s):  
D. N. Braski ◽  
P. D. Goodell ◽  
J. V. Cathcart ◽  
R. H. Kane
Keyword(s):  
Surface Layer ◽  
Oxidation Potential ◽  
Metal Interface ◽  
Elevated Temperature Strength ◽  
Surface Conditions ◽  
Inconel Alloy ◽  
Inco Alloy ◽  
Resistance To Oxidation ◽  
Oxide Particles ◽  
Cold Worked

It has been known for some time that the addition of small oxide particles to an 80 Ni—20 Cr alloy not only increases its elevated-temperature strength, but also markedly improves its resistance to oxidation. The mechanism by which the oxide dispersoid enhances the oxidation resistance is being studied collaboratively by ORNL and INCO Alloy Products Company.Initial experiments were performed using INCONEL alloy MA754, which is nominally: 78 Ni, 20 Cr, 0.05 C, 0.3 Al, 0.5 Ti, 1.0 Fe, and 0.6 Y2O3 (wt %).Small disks (3 mm diam × 0.38 mm thick) were cut from MA754 plate stock and prepared with two different surface conditions. The first was prepared by mechanically polishing one side of a disk through 0.5 μm diamond on a syntron polisher while the second used an additional sulfuric acid-methanol electropolishing treatment to remove the cold-worked surface layer. Disks having both surface treatments were oxidized in a radiantly heated furnace for 30 s at 1000°C. Three different environments were investigated: hydrogen with nominal dew points of 0°C, —25°C, and —55°C. The oxide particles and films were examined in TEM by using extraction replicas (carbon) and by backpolishing to the oxide/metal interface. The particles were analyzed by EDS and SAD.

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