Abstract:Co-based alloy cladding layers (wallex50 and wallex55) were synthesised on 316L stainless steel by vacuum cladding. Experimental results showed that wallex50 composed of γ-Co, WC, Co 6 W 6 C, Cr 7 C 3 , in which in situ reinforcement WC phases were homogeneously distributed in the layer, having a clear and stable interface structure. Wallex55 with externally added WC particles was composed of γ-Co, WC, Co 6 W 6 C, Cr 7 C 3 , CrB, CoWB. The average microhardness of wallex50 and wallex55 was 794 ± 29 and 939 ± 2… Show more
“…During the cladding process, reactions among Fe, B, Cr, and Ni atoms might lead to the FeNi 3 and CrB phase formation in both cases. The presence of WC peak in the WC-NiCrBSi cladding coating is owing to the externally added WC particles, while in the case of IWC-NiCrBSi coating, the presence of WC peak confirms the in-situ reaction between W and C element in the matrix during the vacuum cladding process, and the probable reactions are as follows [22]: Figure 1 XRD pattern of (a) WC-NiCrBSi and (b) IWC-NiCrBSi cladding coating.…”
In this work, the WC-NiCrBSi and in-situ synthesised WC (IWC)-NiCrBSi coatings were successfully fabricated on SS 316 L using vacuum cladding process to investigate the WC-reinforced NiCrBSi alloy by the two methods. XRD, SEM and EDS were performed to characterise the phase constituents, microstructure and chemical composition, respectively. Subsequently, electrochemical corrosion and cavitation tests of the coatings were carried out in 3.5 wt-% NaCl solution. The results showed that the WC-NiCrBSi cladding coating was mainly composed of γ-Ni, FeNi3, WC, Cr23C6 and CrB phases, while the IWC-NiCrBSi cladding coating was composed of γ-Ni, WC, FeNi3, Cr23C6, Cr7C3, CrB phases. The corrosion current density of the WC-NiCrBSi and IWC-NiCrBSi coatings were 5.01 × 10−7 and 3.57 × 10−7 A/cm2, respectively. The combined analysis of cumulative weight loss curve and cavitation morphology revealed a better cavitation resistance by the IWC-NiCrBSi coating than the WC-NiCrBSi coating in 3.5 wt-% NaCl solution.
“…During the cladding process, reactions among Fe, B, Cr, and Ni atoms might lead to the FeNi 3 and CrB phase formation in both cases. The presence of WC peak in the WC-NiCrBSi cladding coating is owing to the externally added WC particles, while in the case of IWC-NiCrBSi coating, the presence of WC peak confirms the in-situ reaction between W and C element in the matrix during the vacuum cladding process, and the probable reactions are as follows [22]: Figure 1 XRD pattern of (a) WC-NiCrBSi and (b) IWC-NiCrBSi cladding coating.…”
In this work, the WC-NiCrBSi and in-situ synthesised WC (IWC)-NiCrBSi coatings were successfully fabricated on SS 316 L using vacuum cladding process to investigate the WC-reinforced NiCrBSi alloy by the two methods. XRD, SEM and EDS were performed to characterise the phase constituents, microstructure and chemical composition, respectively. Subsequently, electrochemical corrosion and cavitation tests of the coatings were carried out in 3.5 wt-% NaCl solution. The results showed that the WC-NiCrBSi cladding coating was mainly composed of γ-Ni, FeNi3, WC, Cr23C6 and CrB phases, while the IWC-NiCrBSi cladding coating was composed of γ-Ni, WC, FeNi3, Cr23C6, Cr7C3, CrB phases. The corrosion current density of the WC-NiCrBSi and IWC-NiCrBSi coatings were 5.01 × 10−7 and 3.57 × 10−7 A/cm2, respectively. The combined analysis of cumulative weight loss curve and cavitation morphology revealed a better cavitation resistance by the IWC-NiCrBSi coating than the WC-NiCrBSi coating in 3.5 wt-% NaCl solution.
“…The carbide could be precipitated from the coating by heating the Ni-W alloy under certain parameters. WC has been synthesized in situ by laser cladding, improving the properties of Ni coating and Co alloy coating [10,11]. Su et al [12] found that the high-frequency induction heat treatment of Ni-W alloy coating yielded Ni 4 W and Ni 6 W 6 C precipitates, achieving a 1100 Hv coat hardness.…”
The present study investigated the surface morphology, phase composition, mechanical properties, and corrosion resistance of Ni-W alloy coatings prepared under current densities of 1–5 A/dm², after undergoing heat treatment at 400 °C, 600 °C, and 900 °C. The grain size of the as-plated Ni-W alloy coating was below 10 nm. After heat treatment at different temperatures, the grain size increased, reaching a maximum value of around 30 nm at 900 °C. Heat treatment crystallized and altered the structure of the coating. Different heat treatment temperatures yielded different precipitates, including Ni4W, Ni6W6C, and WC. The highest coating hardness (820–940 Hv) was achieved at 400 °C, while the best corrosion resistance was achieved at 600 °C. The precipitation hardening phase can be obtained by proper heat treatment temperature, yielding the desired properties of the composite coating.
“…Therefore, introducing an appropriate amount of ductile phase into the metal silicide composite through the alloying process can effectively improve its toughness. In general, the introduced phase possesses excellent low room-temperature toughness and high-temperature strength [10][11][12].…”
A series of γ-Ni ss /Mo 2 Ni 3 Si composite coatings were deposited on the hot-rolled 0.45 wt-% C steel plate using DJ-HL-T5000B CO 2 laser system. The microstructure and phase constitution were studied by XRD and SEM with an attached EDS. Microhardness, toughness and dry sliding wear behaviour of the alloy coating were studied. Research results show that all the designed coatings with different compositions are composed of γ-Ni ss and Mo 2 Ni 3 Si. The volume fraction of Mo 2 Ni 3 Si, as well as the average microhardness, shows an increased tendency as the Ni content decreases from 65% to 50%. The addition of γ-Ni ss ductile phase can effectively improve the toughness of Mo 2 Ni 3 Si-based alloy and prevent the spread of the cracks. Furthermore, the wear resistance of laser-cladded γ-Ni ss /Mo 2 Ni 3 Si coatings exhibits a distinct improvement compared with that of the substrate. The wear mass loss and wear mechanism are affected by the volume fraction of Mo 2 Ni 3 Si.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
