scholarly journals Impact of Mechanical Processes as a Pre-Sulphonitriding Treatment on Tribology Properties of Selected P/M Tool Steels

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3431 ◽  
Author(s):  
Daniel Toboła
Keyword(s):  
Wear Resistance ◽  
Cross Sections ◽  
Tool Steels ◽  
X Ray Diffraction ◽  
Wear Rates ◽  
Different Types ◽  
Pin On Disc ◽  
Slide Burnishing ◽  
Gas Quenching ◽  
Vacuum Furnaces

We have evaluated phase composition changes in the surface layer (SL) and wear resistance of steels investigated after various mechanical processes such as a pre-sulphonitriding treatments. Two various paths of surface modification were employed: Grinding–sulphonitriding (G-SN) and hard turning–slide burnishing–sulphonitriding (T-B-SN). Studies were carried out on Vanadis 8 and Vancron 40 tool steels, which are classified as advanced powder metallurgy (P/M) high-alloyed steels with different types and amounts of carbides. Heat treatment to the final hardness of 64 ± 1 HRC (Vanadis 8) and 62 ± 1 HRC (Vancron 40) was performed in vacuum furnaces with gas quenching. Precipitation of different types such as sulfides, nitrides, and carbides was observed using X-ray diffraction analysis. Tribological properties of SL were evaluated by pin-on-disc experiments. Pins of Al2O3 and 19MnB4 steel were used as counterbodies materials. 3D surface geometrical structure measurements were also performed. Wear tracks and cross-sections of SL were observed using optical and scanning electron microscopy. The three-stage process increases the wear resistance about 37% and 30%, respectively for Vanadis 8 and Vancron 40 (in case of alumina pins), whereas values of wear rates after tests performed against steel pins were very similar for two compared processes for both steels.

scholarly journals Influence of Combined Mechanical Processes on Tribological Properties of Tool Steels Vanadis 8 and Vancron 40 With a Similar Hardness

2021 ◽  
Vol 7 ◽  
Author(s):  
Daniel Toboła ◽  
Aneta Łętocha
Keyword(s):  
Wear Resistance ◽  
Hard Turning ◽  
High Hardness ◽  
High Wear Resistance ◽  
Tool Steels ◽  
Wear Rates ◽  
Resistance Surface ◽  
Slide Burnishing ◽  
Gas Quenching ◽  
Vacuum Furnaces

Surface integrity is important factor for components exposed to wear, like cold working tools, which need to possess high hardness combined with high wear resistance. Surface treatments such as grinding, hard turning, and hard turning with slide burnishing have been developed for its improvement. Vancron 40 and Vanadis 8 tool steels, of different chemical composition and different types and amounts of carbides, were now investigated. Heat treatment was carried out in vacuum furnaces with gas quenching to hardness of Vancron 64 ± 1 HRC and of Vanadis 65 ± 1 HRC. 3D topography, optical and scanning electron microscopy, X-ray diffraction and ball-on-disc tribological tests against Al2O3 and 100Cr6 balls as counterparts were used to examine wear and friction. For both steels, the lowest values of dynamic frictions and wear rates against Al2O3 counterbodies were achieved after sequential process of hard turning with slide burnishing with a burnishing force of 180 N. For alumina balls, the increase of wear resistance, achieved after hard turning plus burnishing in comparison to grinding exceeds 50 and 60%, respectively for Vanadis 8 and Vancron 40 steels.

Thick Si-doped DLC coatings with high load bearing capacity on cold working tool steels by PECVD

2021 ◽  
pp. 1-19
Author(s):  
Xinyu Wang ◽  
Xudong Sui ◽  
Shuaituo Zhang ◽  
Mingming Yan ◽  
Yan Lu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Cold Working ◽  
Chemical Vapor ◽  
Tool Steels ◽  
Dlc Coatings ◽  
Wear Rates ◽  
Si Doped ◽  
Silicon Doped ◽  
Hydrogenated Amorphous ◽  
Degree Of Graphitization

Abstract For improving the wear resistance, thick silicon doped hydrogenated amorphous carbon (a-SiC:H) coatings were deposited on cold working tool steels by Plasma Enhanced Chemical Vapor Deposition (PECVD) technology. The increase of the acetylene (C2H2) flow rate distinctly tuned the microstructure of a-SiC:H coatings, including an increase in the coating thickness (>15 μm), a decrease in the silicon content, a greater sp2/sp3 ratio and higher degree of graphitization. The highest hardness of 19.61 GPa and the greatest critical load of 50.7 N were obtained. The coating showed low wear rates against different friction pairs and presented excellent abrasive wear resistance at high applied load and the wear rates decreased with increasing loads, which exhibited an outstanding application prospect in cold working tool steels.

Mechanical and Tribological Properties of W(100-x)%Cx% Coatings Deposited by DC Magnetron Sputtering

2015 ◽  
Vol 642 ◽  
pp. 184-189
Author(s):  
Yan Liang Su ◽  
Yueh Feng Lin
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Magnetron Sputtering ◽  
X Ray Diffraction ◽  
Mechanical And Tribological Properties ◽  
Unbalanced Magnetron Sputtering ◽  
Unbalanced Magnetron ◽  
Pin On Disc ◽  
Dry Conditions ◽  
Coating Microstructure

W(100-x)%Cx% coatings with different tungsten and carbon contents were deposited by unbalanced magnetron sputtering. The microstructures and mechanical properties of the W(100-x)%C x% coatings was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), nanoindentation and adhesion testing techniques. The tribological performance of the coatings was investigated using a pin-on-disc trobometer under dry conditions. Experimental results indicated that coating microstructure, mechanical properties and wear resistance varied according to the tungsten and carbon contents of the coatings. The W72%C28% coating had the highest hardness/elastic modulus (H/E) ratio. In the ball-on-disc wear tests, it was found that the W72%C28% coating exhibited the best wear resistance.

Tribological Studies of Steels Using the Abrasive Wheel

2009 ◽  
Vol 83-86 ◽  
pp. 545-552 ◽  
Author(s):  
Majid Abbasi ◽  
S. Kheirandish ◽  
Y. Kharrazi ◽  
J. Hejazi
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Soft Materials ◽  
Test Method ◽  
High Wear Resistance ◽  
Test Results ◽  
Abrasive Wheel ◽  
Different Types ◽  
Pin On Disc ◽  
A New Technique

The abrasive wear behaviors of different types of steels were evaluated using the abrasive wheel as a new technique in the pin on disc method. It is shown that the abrasive studies using this test method is acceptable for high wear resistance metals such as Hadfield steels, while it is not proper for soft materials such as mild steel. The test results on the different materials also show that initial hardness of materials cannot merely determine the wear resistance. However, microstructural changes during the sliding have significant effect on the wear behavior and must be included.

Wear and Friction of Unio Crassus Shell in Dry Sliding Contact with Steel

1993 ◽  
Vol 330 ◽  
Author(s):  
J-P. Hirvonen ◽  
R. Lappalainen ◽  
J. Koskinen ◽  
J. Likonen ◽  
M. Pekkarinen
Keyword(s):  
Wear Resistance ◽  
Room Temperature ◽  
High Hardness ◽  
Carbon Films ◽  
Biological Processes ◽  
X Ray Diffraction ◽  
Wear And Friction ◽  
Pin On Disc ◽  
Friction Measurements ◽  
Secondary Ion

ABSTRACTBiological materials such as shells possess a useful combination of mechanical properties. For instance, good fracture toughness combined with a relatively high hardness has been reported. The response of these properties to a tribological performance could presumably be very beneficial. Unfortunately no such research has been reported, although this kind of information is invaluable in possible utilization of biomimetic or biological processes in producing of materials.In this work chemical composition of Unio Crassus shells were characterized using secondary ion mass spectroscopy (SIMS) and Rutherford backscattering spectroscopy (RBS) and the microstructure was determined with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Specimens of 20×10 mm in size with a thickness of a few millimetres were cut and mechanically polished followed by ultrasonic cleaning in deionized water. Wear and friction measurements were performed in a pin-on-disc tester with a hardened steel pin 6 mm in diameter as a counter face. Tests were carried out in a relative humidity of 50 % at room temperature with a sliding speed of 15 mm/s. The measurements indicate a friction coefficient of 0.3 – 0.4 which is reasonable low. Moreover, wear resistance was found to be excellent. The wear resistance of the material was similar to those of the best synthetic diamond-like carbon films. The storage of the specimen at room temperature for 150 days deteriorated the material resulting in much worse tribological properties.

Friction and Wear Behavior of Boronized Chromium for Biological Applications

2005 ◽  
Author(s):  
R. Ribeiro ◽  
S. Ingole ◽  
O. Juan ◽  
H. Liang ◽  
M. Usta ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Characterization ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Work Piece ◽  
X Ray Diffraction ◽  
Friction And Wear Behavior ◽  
Pin On Disc ◽  
Dry Conditions ◽  
Wear Mode

Enhanced corrosion and wear resistance are crucially important to prolong the service life of biomaterials. Boronizing has been reported to enhance the wear resistance of pure chromium. In this research, we investigate friction and wear behavior of boronized chromium. Pin-on-disc tribometer was used to conduct the wear and friction tests. Experiments were conducted in dry conditions as well as in simulated body fluid (SBF). Fundamental aspects of wear mode and lubrication behavior were studied using surface characterization techniques such as TEM, and X-ray diffraction. Results showed evidence of tribo-chemical interactions between SBF and work piece materials.

Influence of Carbon Content in Cobalt-Based Superalloys on Mechanical and Wear Properties

2004 ◽  
Vol 126 (2) ◽  
pp. 204-212 ◽  
Author(s):  
Rong Liu ◽  
Matthew X. Yao ◽  
Xijia Wu
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Carbon Content ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Pin On Disc ◽  
Rotating Bending ◽  
The Impact

Two cobalt-based superalloys containing 1.6% and 2% carbon respectively were studied, with the emphasis on the influence of the carbon content on their microstructures, wear resistance, and mechanical properties. Phase formation and transformation in the microstructures were analyzed using metallographic, X-ray diffraction, and differential scanning calorimetry techniques. Wear resistance, tensile and fatigue behaviors of the alloys were investigated on a pin-on-disc tribometer, MTS machine and rotating-bending machine, respectively. It is found that the wear resistance was increased significantly with the carbon content. The mechanical properties of the alloys are also influenced by the carbon content, but the impact is not so significant as on the wear resistance. It was observed that the carbon content increased the yielding strength and fatigue strength, but decreased the fracture stress and fracture strain.

scholarly journals Microstructure, tribological performances, and wear mechanisms of laser-cladded TiC-reinforced NiMo coatings under grease-lubrication condition

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhu Weixin ◽  
Kong Dejun
Keyword(s):  
Wear Resistance ◽  
Wear Test ◽  
Depth Of Field ◽  
X Ray Diffraction ◽  
Grease Lubrication ◽  
Wear Performance ◽  
Friction Process ◽  
X Ray ◽  
Wear Rates ◽  
Lubrication Condition

Abstract NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings were prepared on GCr15 steel by laser cladding (LC). The microstructure and the phases of the obtained coatings were analyzed using ultra-depth-of-field microscopy (UDFM) and X-ray diffraction (XRD), respectively. A ball-on-disk wear test was used to analyze the friction-wear performance of the substrate and the NiMo-TiC coatings under grease-lubrication condition. The results show that the grain shape of NiMo-TiC coatings is dendritic. The wear resistance of NiMo-TiC coatings is improved by the addition of TiC, and the depths of the worn tracks on the substrate and on the NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings are 4.183 μm, 2.164 μm, 1.882 μm, and 1.246 μm, respectively, and the corresponding wear rates are 72.25 μm3/s/N, 32.00 μm3/s/N, 18.10 μm3/s/N, and 7.99 μm3/s/N, respectively; this shows that the NiMo-25%TiC coating has the highest wear resistance among the three kinds of coatings. The wear mechanism of NiMo-TiC coatings is abrasive wear, and the addition of TiC plays a role in resisting wear during the friction process.

scholarly journals Electrodeposition of Transition Metal Composites on Mild Steel: Structural and Wear Behaviour

2019 ◽  
Vol 8 (6S) ◽  
pp. 534-539
Keyword(s):  
Wear Resistance ◽  
Transition Metal ◽  
Mild Steel ◽  
Composite Coatings ◽  
Wear Behaviour ◽  
Metal Composite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pin On Disc ◽  
Structural Characterizations

Wear characteristics of the transition metal composite (TMC) coated mild steel are investigated. TMC coatings were performed using electrodeposition technique on mild steel. Different concentrations of transition metals were subjected to prepare the TMC’s and studied. The structural and the micro structural studies of the composites coatings were studied through X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The elemental compositions of coated composites were evaluated using Energy dispersive X-ray diffraction (EDS) studies. Both the structural and micro structural characterizations confirmed the formation of composite coatings. Further, it is evident from the EDS analyses that TMC’s are coated with the desired concentrations. In order to understand the wear resistance of coated mild steel, the specimen were subjected to load on pin-on-disc type wear tester. The effects of concentration of composite and thickness of the coating on wear resistance are discussed. The coating results in improving the wear resistance and hardness of the specimen

scholarly journals Evaluation of the Wear Resistance and Corrosion Behavior of Laser Cladding Al/SiC Metal Matrix Composite Coatings on ZE41 Magnesium Alloy

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 639
Author(s):  
Ainhoa Riquelme ◽  
Pilar Rodrigo ◽  
María Dolores Escalera-Rodriguez ◽  
Joaquín Rams
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Laser Cladding ◽  
Wear Behavior ◽  
Composite Coatings ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Wear Rates ◽  
Pin On Disc

Aluminum matrix composites reinforced with SiC particles (SiCp) were deposited on ZE41 magnesium substrates by laser cladding in order to improve their tribological performance. Silicon and titanium were added to the matrix in order to avoid Al-SiC reactivity. The addition of these elements to avoid Al4C3 formation during the laser cladding fabrication was successfully explored in previous research, but the effect of these elements on the wear behavior and the corrosion resistance of these coatings has not been studied. During the fabrication process, there is dilution with the substrate that forms an Al-Mg matrix, which has an influence on the wear and corrosion behavior. Electrochemical polarization and impedance measurements in a 3.5% NaCl solution and the dry sliding conditions on a pin-on-disc tribometer were used to evaluate the different compositions of Al/SiCp coatings on the ZE41 magnesium alloy and uncoated ZE41. All of the composite coatings had lower wear rates than the substrate. However, the coatings showed worse corrosion behavior than the ZE41 substrate, although the addition of Si or Ti improves the corrosion behavior and the wear resistance.

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