Study of the Sliding Wear and Friction Behavior of WC + NiCrBSi Laser Cladding Coatings as a Function of Actual Concentration of WC Reinforcement Particles in Ball-on-Disk Test
“…Few craters formed due to pull out and fractures of WC particulates are also visible (fatigue wear). Similar worn out morphology has been reported by Garcia et al., 29 Ye et al., 17 and Niranatlumpong and Koiprasert. 30 Figure 15.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 16.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 50 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 17.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H13 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 18.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H13 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 50 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 19.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the plasma spray [65% (NiCrBSi) + 35% (WC–Co)] coated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 20.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the plasma spray [65% (NiCrBSi)+35% (WC–Co)] coated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 50 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 21.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the plasma spray [65% (NiCrBSi)+35% (WC–Co)] coated H13 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.…”
Section: Resultssupporting
confidence: 89%
“…Few craters formed due to pull out and fractures of WC particulates are also visible (fatigue wear). Similar worn out morphology has been reported by Garcia et al, 29 Ye et al, 17 and Niranatlumpong and Koiprasert. 30 At 400 C, a decrease in COF was observed for both the uncoated and coated AISI H11 and H13 pin specimens.…”
Section: Surface Roughness Bond Strength and Porosity Of The As-sprsupporting
Knowledge and optimization of tribological behavior of hot forming dies play an important role in attaining high process productivity. But research in this field has been limited. Keeping this in view, the current investigation aims to explore the potential of atmospheric plasma sprayed (APS) 65% (NiCrSiFeBC)–35% (WC–Co) coating in optimizing friction coefficients and minimizing the wear of AISI H11 and AISI H13 hot forming steels at elevated temperatures. Detailed characterization of the as-sprayed specimens was carried out using scanning electron microscopy/energy-dispersive spectroscopy and X-ray diffraction techniques. Wear and friction tests were done utilizing a high-temperature pin-on-disc tribometer under two different loads and temperatures ranging from room temperature to 800 ℃. The results have shown that the developed coating exhibited lower porosity, higher microhardness, and performed much better than the uncoated specimens. The wear mechanisms of the coated specimens were mainly abrasive at room temperatures and 400 ℃. Fatigue, tribo-oxidation, and three-body abrasion were observed as the dominant mechanisms at 800 ℃.
“…Few craters formed due to pull out and fractures of WC particulates are also visible (fatigue wear). Similar worn out morphology has been reported by Garcia et al., 29 Ye et al., 17 and Niranatlumpong and Koiprasert. 30 Figure 15.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 16.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 50 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 17.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H13 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 18.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the uncoated H13 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 50 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 19.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the plasma spray [65% (NiCrBSi) + 35% (WC–Co)] coated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 20.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the plasma spray [65% (NiCrBSi)+35% (WC–Co)] coated H11 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 50 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.Figure 21.Surface scale morphology and EDS analysis showing elemental composition (%) at selected points for the plasma spray [65% (NiCrBSi)+35% (WC–Co)] coated H13 steels subjected to sliding wear tests on high-temperature tribometer for 50 min and 25 N load run at (a) room temperature, (b) 400 ℃, and (c) 800 ℃.…”
Section: Resultssupporting
confidence: 89%
“…Few craters formed due to pull out and fractures of WC particulates are also visible (fatigue wear). Similar worn out morphology has been reported by Garcia et al, 29 Ye et al, 17 and Niranatlumpong and Koiprasert. 30 At 400 C, a decrease in COF was observed for both the uncoated and coated AISI H11 and H13 pin specimens.…”
Section: Surface Roughness Bond Strength and Porosity Of The As-sprsupporting
Knowledge and optimization of tribological behavior of hot forming dies play an important role in attaining high process productivity. But research in this field has been limited. Keeping this in view, the current investigation aims to explore the potential of atmospheric plasma sprayed (APS) 65% (NiCrSiFeBC)–35% (WC–Co) coating in optimizing friction coefficients and minimizing the wear of AISI H11 and AISI H13 hot forming steels at elevated temperatures. Detailed characterization of the as-sprayed specimens was carried out using scanning electron microscopy/energy-dispersive spectroscopy and X-ray diffraction techniques. Wear and friction tests were done utilizing a high-temperature pin-on-disc tribometer under two different loads and temperatures ranging from room temperature to 800 ℃. The results have shown that the developed coating exhibited lower porosity, higher microhardness, and performed much better than the uncoated specimens. The wear mechanisms of the coated specimens were mainly abrasive at room temperatures and 400 ℃. Fatigue, tribo-oxidation, and three-body abrasion were observed as the dominant mechanisms at 800 ℃.
“…Standard deviation analysis indicated, at both sliding distances evaluated, approximately 20% lower variation in the remelted to as-deposited condition. Similar results are reported by García et al (2016) and Zhao et al (2018). Although as-deposited samples showed a tendency of inversely proportional relation between microhardness and wear rate, this behavior was more pronounced in the remelted coating.…”
Section: Friction Coefficient Volumetric Loss and K Archard's Coefficientsupporting
Ni-superalloys coatings deposited via laser metal deposition (LMD) have been known to perform well in increasing components lifespan and consequently reducing production and repair costs. Although most of these coatings already present good results in its hardness, and tribological behavior, some can be improved by post-deposition treatments, such as laser remelting. In this ambit, the present paper aims to evaluate the laser remelting posttreatment effects on the Ni-Cr-B-Si coating sliding tribological behavior. For this, two conditions were compared: Ni-Cr-B-Si coating as-deposited and Ni-Cr-B-Si coating as-deposited and remelted. The coating's occurrence of superficial macro defects, their microhardness, and tribological performance in the pin-on-disk (ASTM G99) test were compared. Friction coefficient (load cell), volumetric loss (optical interferometry), Archard's wear coefficient and worn surfaces (SEM and EDS), were evaluated. Results show that the laser remelting posttreatment was effective in reducing cooling cracks, increasing hardness and reducing friction coefficient oscillation and volumetric loss average.
“…relatively high hardness, reasonable wear resistance and high temperature corrosion [2]. However, numerous studies have been undertaken with the aim of improving the wear resistance of this coating, and these studies have pointed in the direction of adding ''hard'' particles like (WC, NbC, Cr3C2, TiC, SiC, VC, WC-Ni) to the base formed by the secondary material [3]. Among commercial hard coating materials, tungsten carbide (WC) is the most widely used for wear resistance coating for its high hardness.…”
The tungsten carbide based WC-Co/NiCrBSi (50/50) and molybdenum based Mo/NiCrBSi (75/25) coatings were investigated under boundary lubricated sliding conditions, and their tribological properties were analysed and compared. These two coatings are in service for a long time, but there are very few papers dealing with their tribological properties, especially in lubricated sliding conditions. The NiCrBSi self-fluxing alloy is one of the popularly used materials for thermal sprayed coating, with relatively high hardness, reasonable wear resistance and high temperature corrosion. Tungsten carbide (WC) is one of the most widely used commercial hard coating materials, and is added to the NiCrBSi coating to improve its hardness and wear resistance. Molybdenum (Mo) is added to the NiCrBSi coating to reduce its coefficient of friction, i.e. to improve its dry sliding wear resistance. The results showed that WC-Co/NiCrBSi coating was more wear resistant, but caused higher wear of the counterbody material. Coefficients of friction were similar for both coatings.
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