Hard Laves Phase Research Articles

Effect of long-term aging on the microstructure evolution and fracture mechanism of 9% Cr steels

The fracture toughness of pressure pipe steels is vital for their design and safe operation. Understanding the deterioration of the fracture toughness and the corresponding fracture mechanisms is instructive and meaningful for material selection and development. The elastic–plastic fracture toughness of 9% Cr steels aged at 873 K and 923 K from the initial state to 20000 h was investigated at ambient temperature and 873 K. The deterioration of the fracture toughness and the corresponding fracture mechanisms are discussed in detail. For 9% Cr steels, voids mainly initiated from primary inclusions such as silicides, sulfides, alumina and manganides in as-received state, while voids initiated from both primary inclusions and secondary particles such as the Laves phase after long-term aging. These voids grew and coalesced with neighboring voids and crack tips subsequently until ultimately fracture. After aging at 873 K, the fracture toughness values tested at 873 K decreased from the initial state to 3000 h and then increased to 10000 h. The peculiar deterioration of the fracture properties after 3000 h of aging at 873 K can be attributed to the high number density of Laves phase particles in the steels. It was found that the densely distributed hard Laves phase particles induced strain concentration at the interface between the Laves phase and the matrix under plane-strain tension condition and promoted nucleation of voids. It was suggested that the spatial distribution of the Laves phase played a significant role on the void formation. 9% Cr steels with a denser distribution of Laves phases brings about voids with shorter interspaces, which are more susceptible to coalesce into crack tip, resulting in lower fracture resistance. After aging at 923 K from 10000 h to 20000 h, the number density, size and volume fraction of precipitates, block size, misorientation angle and dislocation density remained almost constant. The slight increase in the fracture toughness from 10000 h to 20000 h can be mainly ascribed to the coarsening of the martensite lath in this stage.

A novel W/FeCoCrNi-based in-situ formed high-entropy alloy gradient coating with Laves-FCC dual-phase structure and synergistic friction behavior

Based on the two-way diffusion behavior of FeCoCrNi and W elements and the lattice distortion principle during alloy solidification, a new type of HEA wear-resistant coating with Laves phase and hardness gradient was prepared in this work. Analysis results show that the Laves phase has higher hardness and resistance to deformation, while the FCC phase exhibits higher plastic deformation ability. The tribological properties of the coating material under both room- and high-temperature wear conditions are improved by the synergistic effect of the hard Laves phase and the ductile FCC phase. Moreover, the transition effect of the intermediate eutectic layer alleviates the stress concentration during the friction process, and the oxide film shows a strong wear resistant under the room-temperature wear condition.

AN INVESTIGATION ON MICROSTRUCTURES, MECHANICAL AND WEAR BEHAVIOR OF LASER-CLADDED INCONEL 625 AND NIMONIC 90 OVER NIMONIC 90 SUBSTRATE

The wrought nickel–chromium–cobalt Nimonic 90 alloy is widely used in turbine blades, piston rings and forged tools due to their high stress-rupture strength and creep resistance up to 920∘C. The application components showed unavoidable wear behaviors at high loads due to the reduced resistance of the components. Hence, in order to increase the wear resistance of this alloy, Inconel 625 and Nimonic 90 particle depositions have been carried out on Nimonic 90 substrate through the laser-cladding techniques to study the microstructure, mechanical and tribological behaviors of alloys. The phases, microstructure and microhardness of the claddings were investigated by X-ray diffractometry (XRD), Transmission electron microscopy (TEM), Scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDS) and hardness test, respectively. Results showed that the mean thickness of the interfacial layer of Inconel 625 and Nimonic 90 was 18.51 ± 4 [Formula: see text]m and 90.68 ± 7 [Formula: see text]m, respectively. The microstructure of the cladding surfaces resulted in dendritic and interdendritic structures. An overall analysis found that the gamma-Ni and hard laves phases were presented in Inconel 625 and Nimonic 90 clad surfaces, respectively. Nimonic 90 clad surface had a high hardness and wear resistance compared with Inconel 625 clad surface and substrate due to the present hard laves phase. Besides, the roughness of the Nimonic 90 clad surface was lower compared with the Inconel 625 clad surface and substrate.

Study on the FeCoCrNiMnTix High Entropy Alloys Fabricated by Laser Cladding

Because of the high entropy effect, a simple solid solution structure can be obtained in high entropy alloys (HEAs), giving the HEAs greater overall properties than conventional alloys. Cladding layers of FeCoCrNiMnTix HEAs were prepared on Q355 steel by laser cladding technology. X-ray diffraction (XRD), metallographic microscope (OM), and scanning electron microscope (SEM) were used to examine the microstructure of the cladding layers. The microhardness and wear resistance were tested using a Vickers microhardness tester and wear testing machine, respectively. The FeCoCrNiMn HEAs consisted of a face-centered cubic (FCC) solid solution. The addition of Ti promoted the formation of body-centered cubic (BCC) and hexagonal solid solution. When Ti content was higher than x=0.8, the Laves phase formed. The addition of Ti increased the microhardness of the FeCoCrNiMnTix (x=0.5, 0.6, 0.8, 1.0) HEAs, which is due to the effect of solution strengthening, microstructure strengthening, and grain refinement. When Ti content was less than x=0.6, the alloy’s wear resistance was positively correlated with its hardness, and the Ti0.6 alloy had the best wear resistance. However, as Ti content exceeded x=0.6, the brittle and hard Laves phase formed, which resulted in reduced wear resistance.

Effect of Nb on microstructure and properties of AlCoCrFeNi2.1 high entropy alloy

To overcome the strength limitation of eutectic high entropy alloys (EHEAs) in industrial application, it is necessary to develop new EHEA materials with high strength. In this work, the AlCoCrFeNi2.1Nbx (0 ≤ x ≤ 0.5) high entropy alloys (HEAs) were synthesized by arc-melting introducing heterogeneous structures by adding to the Nb element. The microstructures and mechanical properties of the AlCoCrFeNi2.1Nbx alloys were investigated. The results show that all the AlCoCrFeNi2.1Nbx (x > 0) HEAs are composed of FCC solid solution, B2 solid solution and Fe2Nb-type Laves. The microstructures of the AlCoCrFeNi2.1Nbx alloys change from FCC + B2 dual-phase eutectic structure (x = 0) to FCC + B2/Laves bimodal eutectic structure (x = 0.1), then to the mixed microstructures of FCC + B2 dendrite and FCC + Laves eutectic (0.1 < x ≤ 0.4), and finally to the hypoeutectic structure with BCC primary phase (x = 0.5). With the addition of Nb, the Vickers hardness and compressive yield strength of the AlCoCrFeNi2.1Nbx alloys increase continuously from 294.8 HV to 618.9 HV and 626 MPa–1998 MPa, respectively. Wherein, the AlCoCrFeNi2.1Nb0.2 alloy exhibits the best comprehensive mechanical properties with the compressive yield strength of 1158 MPa and ductility of 29.7%. In addition, the precipitation strengthening of the hard Laves phase and solid solution strengthening is the main strengthening mechanism in the AlCoCrFeNi2.1Nb0.2 alloys.

Effect of Tantalum content on microstructure and mechanical properties of CoCrNiTax medium entropy alloys

CoCrNi medium entropy alloy (MEA) has potential applications in cryogenic environment due to its strength and plasticity enhancement at low temperatures. However, the poor strength at the room temperature limits its widespread application. In this work, the alloying element, Tantalum (Ta), was chosen to strengthen CoCrNi MEA and CoCrNiTax MEAs with different Ta content were designed and prepared. The effect of Ta content on the microstructure and mechanical properties of the corresponding alloys were investigated. It was found that Ta-enriched Laves phase was formed due to the addition of Ta element. The alloy's microstructure experienced from hypoeutectic to eutectic, and then to hypereutectic morphology evolution with increasing Ta addition. CoCrNiTa0.4 alloy was a fully eutectic microstructure with fine lamellar colonies. Its yield strength reached about 2150 MPa, which was greatly improved compared with CoCrNi MEA. In order to understand the strengthen mechanism of CoCrNiTax MEAs, strength contribution of the alloy's individual phase to the lamellar colonies was investigated by the high-throughput nanoindentation mapping technique. It is indicated that Laves phase had very high hardness increasing from ≈16.12 GPa to ≈18.14 GPa, almost 3 times than that of FCC phase (≈6.03 GPa). The strengthening of CoCrNiTax MEAs should be attributed to the production of the hard Laves phase and lamellar colonies.

The microstructure and properties of Fe55Cr15Ni(30-x)Nbx eutectic high-entropy alloys

The emergence of eutectic high entropy alloys (EHEAs) provides new insights for the design of the next generation structural alloys. In this paper, a set of low-cost Co-free Fe55Cr15Ni(30-x)Nbx (x = 0, 3, 6, 9, 12 and 15 at.%) EHEAs was successfully designed and prepared by vacuum arc melting. With the increase of Nb content, the solidification structure of the EHEAs change from single-phase FCC (x = 0) to divorced eutectic structure (x = 3) containing FCC and Laves phase, hypoeutectic structure (x = 6 and 9) and eventually becomes hypereutectic structure (x = 12 and 15). The FCC phase is rich in Fe, Cr and Ni, and the Laves phase is rich in Nb. The addition of Nb result in the increase of the volume fraction of the hard Laves phase which improved the room temperature strength. Solid solution strengthening and second phase strengthening are the main factors affecting the properties of the alloys. In this study, Fe55Cr15Ni21Nb9 alloy shows the best comprehensive mechanical properties, the compressive fracture strength, fracture strain and yield strength are 1216 MPa, 32% and 749 MPa, respectively. Phenomenologically, when the Nb content is in the range of 0–15 at.%, the yield strength of the alloy is a function of the Nb content: σ0.2=550×ex/15.81−256. For (Co)CrFeNi-based high-entropy alloys, a new phase prediction criterion is proposed in this paper. When the d-orbital energy level of the alloy is Md ≤ 0.92, the atomic radius difference is δ ≤ 2.88 or the mixing enthalpy meets −4.16≤ΔHmix≤0, single-phase FCC will be formed. If this is not the case, the FCC + TCP phase will be formed.

Microstructure evolution and properties of NiTiCrNbTax refractory high-entropy alloy coatings with variable Ta content

In this work, the novel NiTiCrNbTax (x = 0.1, 0.3, 0.5, 1) refractory high-entropy alloy (RHEA) coatings were successfully synthesized on Ti6Al4V by laser cladding technology. The effect of Ta content on microstructure, thermal stability, micro-hardness and corrosion resistance of RHEA coatings was investigated in detail. The results showed that NiTiCrNbTax RHEA coatings were composed of BCC, NiTi2-Laves and Cr2Nb-Laves phases. With Ta content increasing, the formation of BCC phase was promoted while the precipitate of Cr2Nb-Laves phase was affected. The average micro-hardness values of Ta0.1, Ta0.3, Ta0.5 and Ta1.0 RHEA coatings were calculated as ~922.8 HV0.3, ~985.1 HV0.3, ~851.3 HV0.3 and ~825.4 HV0.3, respectively. The decrease of micro-hardness value might be ascribed to the reduction of hard Laves phase. After annealing at 900 °C for 3 h, the phase compositions of all RHEA coatings remained unchanged but the grains of Cr2Nb-Laves phase were refined obviously. Besides, RHEA coatings exhibited excellent corrosion resistance and the minimum corrosion current density was 1.08 × 10−7 A/cm2. Moreover, the secondary passivation phenomenon emerged in Ta0.5 and Ta1.0 coatings, and the passive film mainly consisted of the oxidation state of Ti, Cr, Nb, Ta and the sub-oxide state of Nb, Ta.

Co-deformation between the metallic matrix and intermetallic phases in a creep-resistant Mg-3.68Al-3.8Ca alloy

The microstructure of Mg-Al-Ca alloys consists of a hard intra- and intergranular eutectic Laves phase network embedded in a soft α-Mg matrix. For such heterogeneous microstructures, the mechanical response and co-deformation of both phases under external load are not yet fully understood. We therefore used nano- and microindentation in combination with electron microscopy to study the deformation behaviour of an Mg-3.68Al-3.8Ca alloy.We found that the hardness of the Mg2Ca phase was significantly larger than the α-Mg phase and stays constant within the measured temperature range. The strain rate sensitivity of the softer α-Mg phase and of the interfaces increased while activation volume decreased with temperature. The creep deformation of the Mg2Ca Laves phase was significantly lower than the α-Mg phase at 170 °C. Moreover, the deformation zone around and below microindents was dependant on the matrix orientation and was influenced by the presence of Laves phases. Most importantly, slip transfer from the α-Mg phase to the (Mg,Al)2Ca Laves phase occurred, carried by the basal planes. Based on the observed orientation relationship and active slip systems, a slip transfer mechanism from the soft α-Mg phase to the hard Laves phase is proposed. Further, we present implications for future alloy design strategies.

Mechanical and tribological performance of CoCrNiHfx eutectic medium-entropy alloys

The excellent properties of the multi-principal element alloys (e.g., the CoCrNi medium-entropy alloy) make them a perfect candidate for structure materials. Their low strength and poor wear-resistance, however, limit considerably their applications. In this study, a lamellar eutectic microstructure was introduced by addition of Hf into CoCrNi alloy to produce a series of CoCrNiHfx (x = 0.1, 0.2, 0.3 and 0.4) eutectic medium-entropy alloys. A homogeneous eutectic microstructure with an alternate array of the soft FCC solid-solution phase and the hard Laves phase was identified for the as-cast CoCrNiHf0.3 alloy. After an investigation of the microstructure, mechanical and tribological properties, it was found that the hardness (plasticity) increases (decreases) with the increasing volume fraction of the Laves phase and the CoCrNiHf0.3 eutectic alloy exhibits both good plasticity and high strength. The wear behavior is strongly dependent on the applied normal load. For a low normal load, its tribological behavior follows the Archard's equation and a higher hardness due to Hf addition can resist plastic deformation and abrasive wear. When the normal load is high enough, the hypoeutectic or hypereutectic alloy, which possessing either high strength or good ductility but not at the same time, exhibit a poor wear resistance. In comparison, the full eutectic CoCrNiHf0.3 alloy with a superior combination of strength and toughness shows the best wear performance, as it can significantly reduce fracture during wear.

Brazing ZrB2-SiC ceramics to Nb with a novel CoFeNiCrCu high entropy alloy

ZrB2-SiC ceramic and Nb were brazed by using a novel high entropy alloy CoFeNiCrCu filler. Interfacial microstructure, mechanical properties and brazing mechanism of the joint were systematically investigated. It was found that the activity of Cr could be maintained during the brazing process due to the high-entropy mixing effect of CoFeNiCrCu. The newly generated Cr2B had a tooth shape and it improved interfacial bonding between ZrB2-SiC and Nb. A composite microstructure containing a soft FCC and hard Laves phase was formed in the joint due to the presence of Nb and this microstructure significantly enhanced the joint strength. Influences of brazing temperature on the interfacial reaction and shear strength of joint were also investigated. After being brazed at 1160 °C for 60 min, the maximum shear strengths of the joint were 216 and 94 MPa at room temperature and at 650 °C, respectively, indicating the successful use of the filler.

Comparison of microstructure, mechanical and wear behaviour of laser cladded stainless steel 410 substrate using stainless steel 420 and Colmonoy 5 particles

Stainless steel (SS) 410 is widely used in many components of nuclear reactors due to its good corrosion resistance and high strength. However, wear is a major issue of these components due to its continuous sliding. SS 420 and Colmonoy 5 particles were deposited over SS 410 substrate by laser cladding process. Then, X-ray diffraction was used to find the phases present after cladding process. Further, coating morphologies were analysed by scanning electron microscopy (SEM) twinned with energy-dispersive spectroscopy. The obtained morphology indicates the hard laves phase present in the Colmonoy 5 cladding surface and needle-like structure in SS 420 cladding surface. Then, Vickers microhardness test was carried out in order to study the hardness and load-carrying capacity of the cladding specimen. Among those, Colmonoy 5 cladding specimen provide higher hardness due to the presence of laves phase formation. Then, the dry sliding wear study was conducted to calculate the mass loss after 2500 m of sliding. The combined effect of hardness and laves phase formation were reflected in dry sliding wear study analysis of the specimens. Then, to study the wear mechanism and roughness, worn surface morphologies were captured using SEM and white light interferometer, respectively.

Novel (CoFe2NiV0.5Mo0.2)100−xNbx Eutectic High-Entropy Alloys with Excellent Combination of Mechanical and Corrosion Properties

The emergence of eutectic high-entropy alloys (EHEAs) offers new insights into the design of next generation structural alloys, which is due to their stable dual-phase microstructure and outstanding mechanical properties from room to elevated temperatures. In this work, a series of (CoFe2NiV0.5Mo0.2)100−xNbx (0 ≤ x ≤ 12) EHEAs were designed and prepared via vacuum arc-melting. Typical eutectic microstructure composing lamellar face-centered cubic solid solution phase and C14 Laves phase appears in the as-cast EHEA when x = 9. The microstructure turns to hypoeutectic or hypereutectic when x is below or beyond that critical value accordingly. The volume fraction of the hard Laves phase is proportional to the Nb addition, leading to the strength increment yet at the expense of ductility at room temperature. In particular, the EHEA having 4 at% Nb shows a compressive strength of 2.1 GPa with an elongation to fracture of 45%, while EHEAs containing 9 and 10 at% Nb exhibit ultrahigh yield strengths of over 1.4 GPa. The effect of Nb addition on the corrosion resistance of this Cr-free EHEA system was also studied. The EHEA containing 9 at% Nb has the best anti-corrosion performance in the 3.5 wt% NaCl solution at 298 ± 1 K, indicating a good combination of mechanical and corrosion properties.

Microstructure and wear resistance of laser cladded Inconel 625 and Colmonoy 6 depositions on Inconel 625 substrate

Nickel-based alloy Inconel 625 is used in higher mechanical stress applications because of their superior oxidation and creep resistance. However, their undesirable tribological behaviour is the major technical issues in several applications. This research carried out the comparative investigation of Inconel 625 (IN625) and Colmonoy 6 deposition over IN625 substrate by laser cladding technique. The metallurgical, mechanical and tribological properties were investigated. Results showed that the presence of hard laves and γ-Ni phases were observed on Colmonoy 6 and IN625 clad surface, respectively. Besides, Colmonoy 6 clad contains more than 60% of the hard laves phase which has capable of providing higher hardness and wear resistance. The hard laves phase and higher hardness in Colmonoy 6 clad provided a strong network to enhance the wear resistance and reduced the roughness average compared to IN625 clad and base material. The Colmonoy 6 clad was the promising one for the sliding components to resist the sliding wear.

Microstructure and properties of laser-clad FeNiCoCrTi0.5Nb0.5 high-entropy alloy coating

ABSTRACTFeNiCoCrTi0.5Nb0.5 high-entropy alloy coating is prepared on AISI 1045 steel by laser cladding. The cross-sectional macroscopic morphology, phase, microstructure, microhardness and wear resistance are studied systematically. The results show that FeNiCoCrTi0.5Nb0.5 coating has no porosities, cracks or other defects and is well metallurgically bonded to the substrate. The coating is composed of body-centred cubic (BCC) solid solution, face-centred cubic (FCC) solid solution and hard Laves phase. The solid solution phase and Laves phase distribute uniformly and closely in a lamellar shape to form a fine and dense eutectic structure. The microhardness of FeNiCoCrTi0.5Nb0.5 coating is about three times that of the substrate. Compared with the substrate, the coating has superior wear resistance.

Tuning nanostructure using thermo-mechanical processing for enhancing mechanical properties of complex intermetallic containing CoCrFeNi2.1Nbx high entropy alloys

Possibilities of tailoring microstructure and mechanical properties of complex intermetallic containing CoCrFeNi2.1Nbx (x = 0.2, 0.4) high entropy alloys (HEAs) using thermo-mechanical processing were investigated in this work. For this purpose, the homogenized HEAs containing complex Laves phases distributed in the FCC matrix were successfully severely cold-rolled up to 90% reduction in thickness. The cold-rolled HEAs showed a nano lamellar microstructure with fragmented Laves phase particles arranged preferentially along the rolling direction. The microstructure of the Nb0.4 HEA revealed intense deformation zones surrounding the hard Laves phase particles, owing to their higher volume fraction and larger size as compared to those in the Nb0.2 HEA. Upon annealing at 800 °C, the lamellar deformed FCC phase in the two HEAs was transformed into an equiaxed nano-grained structure having fine dispersion of nano precipitates. However, the Nb0.4 showed a decidedly lower recrystallized grain size than the Nb0.2, resulting from the smaller deformed grain size and particle stimulated nucleation. The annealed Nb0.2 showed remarkable strength-ductility combination featured by tensile strength ~1080 MPa and ductility ~21%, originating from the combined effect of a high volume of ductile FCC matrix, remarkable grain refinement, and precipitation hardening. In stark contrast, the annealed Nb0.4 showed complete absence of tensile elongation, likely due to a low volume fraction of the ductile FCC matrix and a high volume fraction of the intermetallic phases. The present study emphasized the critical role of microstructural tailoring for achieving outstanding strength-ductility synergy in complex intermetallic containing CoCrFeNi2.1Nbx HEAs.

Microstructures and Wear Resistance of AlCrFeNi2W0.2Nbx High-Entropy Alloy Coatings Prepared by Laser Cladding

The AlCrFeNi2W0.2Nbx high-entropy alloy (HEA) coatings were synthesized on the 304 stainless steel by laser cladding. The microstructure, microhardness and wear resistance of HEA coatings were investigated. The HEA coatings show a good metallurgical bonding to the substrate, and they consist of the cladding zone, bonding zone and heat-affected zone. The phase structures of the HEA coatings are the BCC solid solution phase and the Fe2Nb-type Laves phase. The Nb0.5 composition shows a hypo-eutectic microstructure; the primary phase is the BCC solid solution phase. While Nb1.0, Nb1.5 and Nb2.0 coatings show hyper-eutectic microstructures, the primary dendrites show the Laves phase. The microhardness of AlCrFeNi2W0.2Nbx coatings increases with increasing Nb content and that of the Nb2.0 coating is up to 890.7 HV, about 4.5 times as the 304 stainless steel. Dry sliding model wear testing has been performed. The AlCrFeNi2W0.2Nbx (x = 1.5, 2.0) high-entropy alloy coatings exhibit an order of magnitude lower wear than 304 stainless steel under the same loading conditions. It is attributed to the larger volume fraction of hard Laves phase and the anti-attrition of newly formed oxidation films during friction process.

Microstructures and mechanical properties of Nb-alloyed CoCrCuFeNi high-entropy alloys

Nb has a positive effect on improving the mechanical properties of metal materials, and it is expected to strengthen CoCrCuFeNi high-entropy alloys (HEAs) with outstanding ductility and relatively weak strength. In this paper, the alloying effects of Nb on the microstructural evolution and the mechanical properties of the (CoCrCuFeNi)100-xNbx HEA were investigated systematically. The result shows that Nb promotes the phase transition from FCC (face-centered cubic) to Laves phase, and the volume fractions of Laves phase increase from 0% to 58.2% as the Nb content increases. Compressive testing shows that the addition of Nb has a positive effect on improving the strength of CoCrCuFeNi HEA. The compressive yield strength of (CoCrCuFeNi)100-xNbx HEAs increases from 338MPa to 1322MPa and the fracture strain gradually reduces from 60.0% (no fracture) to 8.1% as the Nb content increases from 0 to 16 at.%. The volume fraction increase of hard Laves phase is the key factor for the strength increase, and the reduction of the VEC (valence electron concentration) value induced by the addition of Nb is beneficial for the increase of the Laves phase content in these alloys.

Designing eutectic high entropy alloys of CoCrFeNiNbx

Based on surveying the existing binary phase diagrams with eutectic points, a strategy of designing eutectic high entropy alloys (EHEAs) with desired high strength and ductility is proposed. Based on the computer-aided thermodynamic calculations, the pseudo eutectic binary alloy system of CoCrFeNiNbx (x = 0.1, 0.25, 0.5 and 0.8) was designed. The experimental results show that the eutectic alloys are composed of a ductile face centered cubic (FCC) phase and a hard Laves phase with fine laminar structures. The designed alloys show excellent integrated mechanical properties of ductility and strength. For the CoCrFeNiNb0.5 alloy, the compressive fracture strength and strain can reach above 2300 MPa and 23.6%, respectively.

Influence of Processing on the Microstructure and Properties of CoCrMoSi Alloy PTA Coatings

AbstractWear performance as well as the low toughness of CoCrMoSi alloys is associated with the presence of Laves phase. In light of this, alloying elements have been altered in order to reduce the brittleness of newly-cast alloys. This study evaluated coatings by Plasma Transferred Arc (PTA) with different interactions with the AISI 316L substrate. The higher the dilution, it was hypothesized, the higher Iron, Chromium and Nickel contents proceeding from substrate and, therefore, the lower hard Laves phase fraction. Coatings were characterized by light and scanning electron microscopy, X-ray diffraction and Vickers hardness. Wear behavior was assessed by pin-on-disc and ball-on-flat tests. Laves phase and Cobalt solid solution eutectic lamellar microstructure was observed for coating processed with 120A (18% dilution). The chemical composition was displaced to hypoeutectic, showing Cobalt solid solution dendrites and interdendrictic eutectic lamellar for the coatings processed with higher current intensity (150 / 180A), due to the higher interaction with the substrate (26 / 38% dilution). Dilution increased with the deposition current, causing hardness to decrease from 702 – 526 HV0.5. Wear mass loss rate increased by up to 41.7% and friction coefficient (μ) ranged from 0.45 – 1.06 as the chemical composition changed.