scholarly journals Characteristics of Thermally Sprayed WC Cermet Coating under Lubricated Rolling with Sliding Contact

1970 ◽  
Vol 37 ◽  
pp. 18-23
Author(s):  
DM Nuruzzaman ◽  
Akira Nakajima ◽  
Toshifumi Mawatari
Keyword(s):  
Surface Roughness ◽  
Carbon Steel ◽  
Steel Substrate ◽  
High Energy ◽  
Hardened Steel ◽  
Sliding Contact ◽  
Steel Roller ◽  
Cermet Coating ◽  
Mating Surface ◽  
Thermally Sprayed

The characteristics of thermally sprayed WC-Cr-Ni cermet coating under lubricated rolling with sliding contact condition were examined experimentally. Experiments were performed using a two-roller testing machine. The coating was formed onto the blasted or ground roller specimens made of thermally refined carbon steel or induction hardened carbon steel by high energy type flame spraying (Hi-HVOF). A mirror-like finished cermet coated steel roller was mated with a non-coated carburized hardened steel roller. In the case of thermally refined steel substrate and for the mating surface roughness Rmax=0.1 μm, coating on the ground substrate showed lower durability than that on the blasted substrate. For the mating surface roughness Rmax=3.0 μm, coating on the ground substrate showed an extremely short life as compared with that on the blasted substrate. In general, durability of cermet coating was greatly increased due to the increase in the coating thickness. In the case of induction hardened steel substrate, coating on the blasted or ground substrate showed high durability for both Rmax=0.1 μm and 3.0 μm. Coefficient of friction and oil film thickness were markedly influenced by the mating surface roughness but these were hardly affected by the substrate material. In addition, depending on the mating surface roughness, significant differences in the surface roughness of coated roller and depth of flaking on the coated roller were found. Keywords: WC cermet, Mating surface roughness, Substrate surface kind, Substrate materialdoi:10.3329/jme.v37i0.815Journal of Mechanical Engineering Vol.37 June 2007, pp.18-23

scholarly journals DURABILITY AND TRIBOLOGICAL PROPERTIES OF THERMALLY SPRAYED WC CERMET COATING IN LUBRICATED ROLLING WITH SLIDING CONTACT

2010 ◽  
Vol 8 (1) ◽  
pp. 49-62
Author(s):  
Mohammad Ali ◽  
Dewan Nuruzzaman ◽  
Nakajima Akira ◽  
Toshifumi Mawatari
Keyword(s):  
Contact Pressure ◽  
Tribological Properties ◽  
High Energy ◽  
Sliding Contact ◽  
Flame Spraying ◽  
Steel Roller ◽  
Cermet Coating ◽  
Mating Surface ◽  
Energy Type ◽  
Thermally Sprayed

Durability and tribological properties of thermally sprayed WC-Cr-Ni cermet coating were investigated experimentally in lubricated rolling with sliding contact conditions. By means of the high energy type flame spraying (Hi-HVOF) method, the coating was formed onto the axially ground and circumferentially ground roller specimens made of a thermally refined carbon steel. In the experiments, the WC cermet coated steel roller was mated with the carburized hardened steel roller without coating in line contact condition. The coated roller was mated with the smooth non-coated roller under a contact pressure of 1.0 or 1.2 GPa, and it was mated with the rough non-coated roller under a contact pressure of 0.6 or 0.8 GPa. As a result, it was found that in general, the coating on the circumferentially ground substrate shows a lower durability compared with that on the axially ground substrate and this difference appears more distinctly for the higher contact pressure for both smooth mating surface and rough mating surface. It was also found that there are significant differences in the tribological properties of WC cermet coating depending on the contact pressure. In addition, depending on the smooth or rough mating surface, remarkable differences in the tribological properties were found.

scholarly journals Durability and Tribological Properties of Thermally Sprayed WC Cermet Coating in Full Film and Partial EHL Contacts

1970 ◽  
Vol 36 ◽  
pp. 38-43
Author(s):  
DM Nuruzzaman ◽  
A Nakajima ◽  
T Mawatari
Keyword(s):  
Contact Pressure ◽  
Tribological Properties ◽  
Elastohydrodynamic Lubrication ◽  
High Energy ◽  
Flame Spraying ◽  
Steel Roller ◽  
Cermet Coating ◽  
Lubrication Condition ◽  
Energy Type ◽  
Thermally Sprayed

Durability and tribological properties of thermally sprayed WC-Cr-Ni cermet coating were investigated experimentally under full film and partial elastohydrodynamic lubrication (EHL) conditions. By means of the high energy type flame spraying (Hi-HVOF) method, the coating was formed onto the axially ground and circumferentially ground roller specimens made of thermally refined carbon steel. The WC cermet coated steel roller was mated with the carburized hardened smooth steel roller under full film EHL condition and carburized hardened rough steel roller under partial EHL condition. It was found that, in general, the coating on the circumferentially ground substrate shows a lower durability compared with that on the axially ground substrate and this difference appears more distinctly for the higher contact pressure for both full film and partial EHL conditions. It was also found that there are significant differences in the tribological properties of WC cermet coating depending on the contact pressure. In addition, depending on the lubrication condition, remarkable differences in the tribological properties were found.Keywords: WC cermet, Full film EHL, Partial EHL, Durability, Tribological properties Journal of Mechanical Engineering Vol.36 Dec. 2006 pp.38-43DOI = 10.3329/jme.v36i0.809

Cermet ESD coatings modified by laser treatment

2012 ◽  
Vol 57 (3) ◽  
pp. 665-670 ◽  
Author(s):  
N. Radek ◽  
N. Konstanty
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Carbon Steel ◽  
Laser Treatment ◽  
Vickers Microhardness ◽  
Steel Substrate ◽  
Substrate Surface ◽  
Wear Resistant Coatings ◽  
Powder Metallurgy Route

The main objective of the present work was to determine the influence of laser treatment on microstructure, microhardness, roughness, bonding strength, corrosion resistance and tribological properties of wear resistant coatings produced on C45 carbon steel by the electro-spark deposition (ESD) process. Consumable WC-Co-Al2O3 electrodes were prepared by the powder metallurgy route and transferred to the substrate surface using the EIL-8A apparatus. The cermet layers were subsequently melted by means of the BLS 720 Nd:YAG laser. The coating characterisation studies showed marked improvements in the bonding between the steel substrate and the cermet coating, and in corrosion resistance at the expense of higher surface roughness and minor drop in the Vickers microhardness.

Influence of On-the-Machine Laser Hardening on Machinability of Carbon Steel in Turning

2009 ◽  
Vol 407-408 ◽  
pp. 690-693
Author(s):  
Takahiko Kusano ◽  
Ryutaro Tanaka ◽  
Akira Hosokawa ◽  
Takashi Ueda ◽  
Tatsuaki Furumoto ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Carbon Steel ◽  
Hardened Steel ◽  
Laser Hardening ◽  
Hardened Zone ◽  
Spiral Form ◽  
Aisi 1045 ◽  
Steel Aisi ◽  
Turning Test ◽  
Continuous Chip

This study deals with the influence of laser hardening for a carbon steel AISI 1045 on machinability in turning. Turning test was conducted for the purpose to clarify the influence of laser hardening for steel surface on the chip controllability and surface roughness. In turning laser hardened steel, continuous chip is broken in the laser hardened zone during cutting due to higher brittleness. The broken chips have spiral form and their length is approximately equal to those generated by less than 10 revolution cutting. The surface roughness shows slightly lower compared with non-laser hardened steel.

scholarly journals Corrosion Behavior of Laser-clad Mo2NiB2 Cermet Coating on Low Carbon Steel Substrate

2015 ◽  
Vol 55 (7) ◽  
pp. 1460-1467
Author(s):  
Qianlin Wu ◽  
Wenge Li ◽  
Ning Zhong ◽  
Chunhua Fan ◽  
Boyang Liu
Keyword(s):  
Carbon Steel ◽  
Corrosion Behavior ◽  
Steel Substrate ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Cermet Coating

Improvement of Hardness and Wear Resistance of Steel-Based Surface Composites Fabricated by High-Energy Electron Beam Irradiation

2007 ◽  
Vol 345-346 ◽  
pp. 637-640
Author(s):  
Duk Hyun Nam ◽  
Kyu Hong Lee ◽  
Sung Hak Lee
Keyword(s):  
Wear Resistance ◽  
Electron Beam ◽  
Carbon Steel ◽  
Electron Beam Irradiation ◽  
Steel Substrate ◽  
High Energy ◽  
High Energy Electron ◽  
Beam Irradiation ◽  
Surface Composite ◽  
Surface Composites

The present study is concerned with the improvement of hardness and wear resistance in (Cr3C2,CrB)/carbon steel surface composites fabricated by high-energy electron beam irradiation. Two kinds of powder mixtures, 50Cr3C2-50STS304 and 50CrB-50STS304 (wt.%), were placed on a plain carbon steel substrate, which was then irradiated with electron beam. The surface composite layer of 1.0~1.3 mm in thickness was successfully formed without defects, and contained a large amount (up to 58 vol.%) of Cr7C3 or Cr1.65Fe0.35B0.9 particles in the austenite or martensite matrix. The hardness and wear resistance of the surface composites were 2~3 times higher than those of the steel substrate according to hard particles. Particularly, the surface composite fabricated with CrB powders showed excellent wear resistance because selective wear of the matrix was considerably reduced.

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