The wettability-corrosion trade-off in liquid/gas diffusion layers (LGDLs) of PEM water electrolyzers remains a persistent challenge in achieving both long-term durability and efficient electrochemical performance. In this study, titanium-based porous LGDLs with varying porosity levels were fabricated via Selective Laser Melting (SLM) and systematically investigated to resolve this design conflict. Three distinct porosity configurations (S1, S2, S3) were produced by adjusting laser parameters, resulting in increasing open porosity and decreasing wettability (contact angle increased from similar to 60 degrees in S1 to similar to 118 degrees in S3). Electrochemical testing demonstrated that the highest-porosity sample (S3) achieved the highest corrosion resistance, with a current density of only 20.18 mu A < middle dot > cm(-2). Remarkably, despite its low wettability, S3 also exhibited the best PEM cell performance, reaching a peak current density of 29 mA.cm(-2) at 2.0 V, which is more than 20 % of that of S1. This enhancement is attributed to the improved gas/liquid transport efficiency afforded by the interconnected high-porosity network, especially under pressurized flow conditions, which dominates over surface wetting effects. These results highlight that engineering porosity through SLM can simultaneously optimize corrosion resistance and electrochemical output, offering a promising pathway toward more durable and efficient LGDLs for next-generation PEM water electrolyzers in clean hydrogen production systems.

PurposeThe purpose of this study to investigate the effects of laser power, hatch spacing and layer thickness on the mechanical and physical properties of the novel Ti-Ag samples produced by selective laser melting (SLM) using electroless silver coated Ti powder.Design/methodology/approachA RSM-based experimental design was used to assess the impact of various parameters on the performance of the system. The laser power, the hatch spacing and the layer thickness were evaluated at three distinct levels of 75-87.5-100 W, 40-60 - 80 mu m and 20-30 - 40 mu m, respectively.FindingsAccording to the results, increasing laser power improves the material properties, while increasing layer thickness has negative effects. Hatch spacing showed a positive effect up to a certain level, but relative density and hardness decreased at higher hatch spacing values. The highest relative density was 95.61%, and the lowest was 88.59%. The highest hardness was measured at 302.53 HV, while the lowest was 204.53 HV. The highest electrical conductivity value was 1.9 IACS%, and the lowest was 1.1 IACS%.Originality/valueAs a result of the optimization studies, 100 W laser power, 80 mu m hatch spacing and 20 mu m layer thickness were determined as the most suitable SLM parameters. This study provides novel insights into the processing of electroless silver-coated Ti powders via SLM, demonstrating its potential for fabricating Ti-Ag composites with tailored properties.

The processing of the high-strength AA2024 alloy using the laser powder bed fusion technique is significantly constrained by two factors: its hot-crack sensitivity and thermal reflective properties. The objective of this work is to investigate and establish the inherent limits of processability of AA2024 alloy through the determination of a map of trade-off between densification and defect generation. The current investigation involves the evaluation of a 27-set parametric matrix comprising of variations in laser power levels (100–200 W), scan speeds, and hatch spacings, which relate the stability of melt pools to porosity and material properties. Even though volumetric energy density was used as a screening tool, this study illustrates its constraints by observing different defect morphology characteristics despite using parameters with same VED values, thereby revealing that VED is not sufficient in characterizing melt pool behavior. The study shows a clear trend with regard to the transition from lack of fusion porosity defects with low VED values (< 100 J/mm3) to excessive thermal stress defects associated with higher values (> 170 J/mm3) with density approaching near full value (99.8

In this study, the effects of Cu matrix morphology and Cu-coated SiC reinforcement ratio on the microstructure, mechanical, and electrical properties of Cu-SiC composites were investigated. Dendritic and flake morphologies were used as Cu matrix morphologies, while Cu-coated SiC particle ratios were selected as 5, 10, and 20% by volume. FESEM/EDS and XRD analyses confirmed that the surface of the SiC particles was homogeneously coated with Cu. This strategy was taken to enhance the matrix-reinforcement interface and achieve a more compact composite. Results show that matrix morphology is an important factor in the performance of the composites. Composites of flake Cu matrix have demonstrated increased relative density (90.96 vs. 87.82%), hardness (~ 135 vs. ~110 HB), tensile strength (~ 252 vs. 177 MPa), and electrical conductivity (88% IACS vs. 75% IACS) compared to composites of dendritic Cu matrix. The flake Cu matrix composite containing 10 vol% Cu-coated SiC reinforcement showed the most stable performance in terms of mechanical and electrical properties. In this context, this composite was shown to be a scalable and high-performance material candidate for the field of electrical materials.

This study investigates the sustainable production of high-purity copper powders obtained from recycled scrap copper sheets through the electrolysis method. With increasing environmental concerns and the growing need for resource efficiency, recycling-based copper powder production has emerged as an attractive and sustainable alternative to conventional production methods. The study aims to optimize electrolysis parameters affecting powder morphology and properties in order to enhance the industrial applicability of the material. The Taguchi method was applied to optimize current density, solution concentration, and electrode distance, focusing on their effects on average particle size and apparent density. An orthogonal array design and ANOVA analyses were employed to identify optimal processing conditions. Material characterization was performed using scanning electron microscopy (SEM), laser particle size analysis, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The synthesized dendritic copper powders were grouped by average size (21.61 mu m, 52.24 mu m, and 87.97 mu m) and subsequently densified by hot-pressing to evaluate their physical, mechanical, electrical, and thermal properties. Samples with an average size of 52.24 mu m exhibited the best overall performance, achieving 98.5 % IACS electrical conductivity, 386 W/m & sdot;K thermal conductivity, 94 HB hardness, and 137 MPa tensile strength. The results demonstrate that recycled electrolytic copper powders can achieve high performance levels while simultaneously supporting sustainable production practices and improved industrial efficiency.

This study compares the wear resistance of PVD-coated single-layer TiSiN (S1) and double-layered AlTiCrN/TiSiN (S2) on AISI 4140 steel, highlighting the enhanced wear performance of the bilayer coating. Wear behavior was evaluated through microstructural, phase, and tribological analyses, supported by hardness, thickness, profilometer, and wettability measurements. The results show that the thickness of the TiSiN coating layer on the AISI 4140 steel substrate was measured as 4.15 ± 0.11 µm, whereas the thickness of the double-layer AlTiCrN/TiSiN coating on the same substrate was determined to be 6.63 ± 0.16 µm. The hardness of the double-layer coated sample (2922 ± 56 HV) is approximately 57% higher than that of the single-layer AlTiCrN-coated sample (1862 ± 45 HV), indicating a substantial enhancement in hardness due to the double-layer coating architecture. While the contact angle of sample S2 is 52.3 ± 0.6°, that of S1 is 28.8 ± 0.8°, corresponding to an approximately 82% increase in contact angle for S2, which indicates enhanced hydrophobic behavior. Unlike the single-layer TiSiN coating, which loses its load-bearing capacity and suffers severe substrate damage under high loads and long sliding distances, the AlTiCrN/TiSiN double-layer coating maintains its integrity through the formation of a tribofilm and provides markedly superior wear resistance, as indicated by the wear test results. At 20 N, the specific wear rate of S1 increased from 28.71 ± 1.74 to 51.79 ± 2.35 × 10⁻⁶ mm³/Nm over 500–1000 m, while S2 showed a greater increase (18.46 ± 1.69to 23.46 ± 1.89 × 10⁻⁶ mm³/Nm), confirming the superior wear resistance of S2.

This study systematically investigated the effects of different post-fabrication heat treatments on the microstructural, mechanical, and tribological properties of a novel Ti-Ag alloy produced by selective laser melting (SLM). Unlike conventional powder mixing methods reported in the literature, electroless Ag-coated Ti powders were used as feedstock, enabling controlled Ag distribution in the Ti matrix through post-SLM heat treatments. X-ray diffraction analysis confirmed that the α-Ti-based matrix structure was preserved in all samples, while oxide phases formed after heat treatment. The water-cooled and aged specimen (HT-3) exhibited the highest hardness (508.9 ± 13 HV), corresponding to a 68.8% increase compared to the untreated SLM specimen. This improvement was attributed to Ag-rich precipitate formation and stabilization of rutile/anatase phases. Tensile testing showed that the as-built SLM specimen had the highest tensile strength (639.5 MPa), whereas heat-treated samples showed reduced strength due to oxidation and microstructural changes during cooling. Under 15 N load and 100 m sliding distance, heat-treated specimens demonstrated significantly lower friction coefficients, with HT-3 reaching 0.48 (22.6% reduction). HT-3 also exhibited the lowest volume loss, indicating superior wear resistance and stable friction behavior.

This study investigates the recycling of Co-Cr-Mo-W support structures generated during laser powder bed fusion (LPBF) via mechanical milling and their reuse as powder feedstock. Support structures were milled at rotational speeds of 300-500 rpm for durations up to 10 h, and the resulting powders were systematically characterized. Milling at 500 rpm for 6 h (S10) yielded the most favorable powder characteristics, including a relatively narrow particle size distribution (D50 approximate to 26 & micro;m), reduced oxygen content, and stabilization of the gamma-FCC phase. Prolonged milling promoted cold welding and agglomeration, leading to a deterioration in powder quality. The recycled S10 powder was subsequently reused in LPBF processing. Initial fabrication using standard parameters resulted in defects such as balling and delamination; however, optimization of processing conditions (100 W laser power, 600 mm/s scan speed, 40 & micro;m hatch spacing, 20 & micro;m layer thickness, and an alternating scan strategy) enabled the production of dense and defect-free specimens. The optimized Re-CoCr alloy exhibited a hardness of 416 HV0.5, a density of 7.477 g/cm3 (90-92% of theoretical), and an ultimate tensile strength of 450 MPa with limited elongation (1%). These results demonstrate the technical feasibility of recycling LPBF support structures into reusable Co-Cr-Mo-W powder feedstock, while highlighting that reduced ductility may constrain application to non-critical biomedical components. Cost analysis further revealed that recycling-assisted LPBF production reduced material costs by approximately 97% compared with commercial gas-atomized powders, underscoring the strong economic potential of the proposed recycling route.

In this study, the effects of 0 wt% (C0), 10 wt% (C1), 20 wt% (C2) and 40 wt% (C3) B4C content on the microstructure, mechanical properties and dry wear properties of Al2024/B4C composites were investigated. In order to prepare Al2024 matrix composites with different B4C particle contents, mechanical milling (MM) and hot pressing (HP) were employed as powder metallurgy methods. It was found that the theta (CuAl2) phase content in the microstructure of Al2024/B4C compact materials increased with increasing B4C particle reinforcement, reaching its highest value at 40 wt% B4C (C3) reinforcement ratio. As the B4C particle reinforcement content increased, the hardness values of the composite samples increased. Flexural strength values were 445.30 MPa, 495.20 MPa, 277.59 MPa, and 129.37 MPa for samples coded C0, C1, C2, and C3, respectively. It was found that the C0 sample without particle reinforcement exhibited more than 10 times the volume loss of the C3 sample with the highest particle reinforcement at 450 m sliding distance. The SEM examination of the friction surfaces of the Al2024/B4C composite samples showed that the worn surfaces were composed of delamination, adhesion and smearing layers.

Aluminum alloys offer excellent opportunities for the development of additive manufacturing (AM) production as one of the key materials widely used in the aerospace and automotive industries. The AlSi10Mg alloy, which is of great interest due to its good machinability and relatively low cost, is one of the aluminum alloys produced by laser powder bed fusion (LPBF), the most widely used additive manufacturing (AM) techniques. In this study, 27 different AlSi10Mg alloys were fabricated by considering and varying the most important LPBF process parameters affecting the physical and mechanical properties of the produced parts and a systematic material characterization approach was used. Among the 27 samples, the samples with the best surface roughness characteristics were found to be samples coded S2, S11 and S20 with 100 W, 150 W and 200 W laser power, 30 mu m layer thickness, 0.05 mm hatch spacing and 750 mm/s scanning speed, respectively. On the other hand, it was found that the optimum alloy parameters with the best physical and mechanical properties were those used in the production of the S11 coded specimen when the microstructure, Brinell hardness, micro hardness and density measurements of the S2, S11 and S20 specimens with the best surface properties were evaluated. The micro hardness value of sample S11 was found to be 141.4 +/- 2.1 VHN, while the Brinell hardness value of the sample was determined to be 127.2 +/- 1.9 BHN. It was found that the tensile strength (384.1 Mpa) of sample S11 was 95 % greater than that (196.8 MPa) of sample S2 and that the tensile strength was approximately 40 % greater than that (279.8 MPa) of sample S20.

Bu çalışmada, Al-Cu-Mg alaşımı 450oC (A), 500oC (B) ve 550oC (C) sıcaklıklarında sıcak presleme işlemine tabi tutulmuştur. Sıcak presleme yöntemi kullanılarak yoğunlaştırılan A, B ve C kodlu numunelerin sıcak pres sonrası mikro yapısı ve tribolojik özelliklerinin incelenmesi gerçekleştirilmiştir. Deneyler sonucunda elde edilen mikro yapı incelemelerinde A kodlu numunedeki porozite miktarının B ve C kodlu numunelerdeki porozite oranına göre yüksek olduğu ve artan presleme sıcaklığı ile yoğunluğun doğru orantılı olarak arttığı belirlenmiştir. Buna ek olarak artan pres sıcaklığı ile birlikte iç yapıda bulunan α-Al fazının nispeten daha düzgün ve eş taneler şeklinde yapıya homojen dağıldığı gözlenmiştir. En yüksek sertlik değeri 550oC’de sıcak presleme işlemine tabi tutulan C kodlu numunede elde edilmiştir. Buna göre, C numunesinin sertlik değeri B kodlu numuneye göre %20, A kodlu numuneye göre %26, mikro sertlik değeri ise B kodlu numuneye göre %30 A kodlu numuneye göre %33’lük bir artış sergilemiştir. Ayrıca A, B ve C kodlu numunelerin yoğunluk değerleri sırasıyla, 2.7554, 2.7640 ve 2.7655 gr/cm3 olarak belirlenmiştir. Yapılan sürtünme ve aşınma testlerinden elde edilen hacim kaybı-çevrim sayısı verilerine göre en düşük aşınma direnci A numunesinde, en yüksek aşınma direnci ise C numunesinde elde edilmiştir. Buna göre 25x103, 50x103 ve 75x103 çevrim sayısındaki C kodlu numune A numunesine göre sırasıyla %39, %23 ve %45 daha yüksek aşınma direnci sergilemiştir. Farklı sıcaklıklarda presleme işlemi yapılan A, B ve C numunelerinin aşınma yüzeylerinin, aşınma parçacıklarının ve bilye yüzeylerinin benzer görüntü sergilediği belirlenmiştir. Buna göre aşınma yüzeyleri sıvama tabakalarından ve soyulmalardan, aşınma parçacıklarının irili ufaklı tozlardan bilye yüzeylerinin ise sıvama tabakalarından meydana geldiği gözlenmiştir.

This study was conducted to comprehensively investigate the effect of mechanical milling parameters on the properties of electrolytic pure copper powders and hot pressed billets fabricated from recycled copper wastes. Three different milling speeds, five different milling times and three different ball to powder weight ratios were used to fully reveal the effect of the mechanical milling process on the properties of recovered Cu powders. The results show that as the milling time and milling speed increased, the initial dendritic morphology of the copper was transformed into a flake-like structure. At 400 rpm and a 5:1 BPR parameters, the average particle sizes of C3, C4, and C5 after 2, 4, and 8h were similar to 52 mu m, 83 mu m, and 71 mu m, respectively. This suggests that particle size initially increases due to shape change and cold-welding, but at longer durations, fracture becomes dominant. The I5 with d(0.5) = 69.32 mu m exhibited a high flow rate of 5.88 g/s with an apparent density of 2.9 g/cm(3).While the hardness value of the Cu samples (A1-bulk sample) produced by exposure to the lowest deformation during the mechanical milling is 95.02 HB, the hardness value of the Cu specimens (F5-bulk sample) showing the highest apparent density, best flow rate and highest density values is 109.31 HB. The electrical conductivity values were determined to be approximately 52.2 MS/m, 57.4 MS/m and 44.3 MS/m for A1-bulk, F5-bulk and H5-bulk, respectively. This study offers valuable insights into the relationship between milling parameters, powder characteristics, and final material properties.

Reinforcing materials used in the production of metal matrix composites are used to improve the properties of the final composite. However, the compatibility between matrix and reinforcement and the reinforcement ratio directly affects the properties of the composite material. For this reason, low reinforcement ratios are preferred in many studies on ceramic particle reinforced composites. Unlike conventional studies, in this study, the effects of 10 wt%, 20 wt% and 40 wt% SiC content on the microstructure, dry wear properties and corrosion properties of Al2024 matrix composites were investigated. θ phase content became higher as the SiC content was increased. Hardness values increased with increasing SiC reinforcement. The highest value (307.68 HB) was obtained for the composite with 40 wt% SiC reinforcement, an increase of more than 100%. A decrease in volume loss with increasing SiC reinforcement was observed in the friction and wear tests. For 5 N of load and 1200 m of sliding distance, it was found that an addition of 40 wt% of SiC particles in Al2024 matrix results decrease in volume loss by almost 722%.

In this study, the microstructure, hardness, tensile strength, and dry wear properties of the cast AlSi10Mg alloy as well as the effects of processing parameters on the oxidation behavior of this alloy were investigated. In this context, AlSi10Mg (wt

Bu çalışmada, Al-Cu-Mg alaşımı 450oC (A), 500oC (B) ve 550oC (C) sıcaklıklarında sıcak presleme işlemine tabi tutulmuştur. Sıcak presleme yöntemi kullanılarak yoğunlaştırılan A, B ve C kodlu numunelerin sıcak pres sonrası mikro yapısı ve tribolojik özelliklerinin incelenmesi gerçekleştirilmiştir. Deneyler sonucunda elde edilen mikro yapı incelemelerinde A kodlu numunesindeki porozite miktarının B ve C kodlu numunelerdeki porozite oranına göre yüksek olduğu ve artan presleme sıcaklığı ile yoğunluğun doğru orantılı olarak arttığı belirlenmiştir. Buna ek olarak artan pres sıcaklığı ile birlikte iç yapıda bulunan α-Al fazının nispeten daha düzgün ve eş taneler şeklinde yapıya homojen dağıldığı gözlenmiştir. En yüksek sertlik değeri 550oC’de sıcak presleme işlemine tabi tutulan C kodlu numunede elde edilmiştir. Buna göre, C numunesinin sertlik değeri A numunesine göre %26, mikro sertlik değeri ise %33 artmıştır. Ayrıca A, B ve C kodlu numunelerin yoğunluk değerleri sırasıyla, 2,7554, 2,7640 ve 2,7655 gr/cm3 olarak belirlenmiştir. Sürtünme ve aşınma deneylerinden elde edilen hacim kaybı-çevrim sayısı verilerine göre en yüksek aşınma direnci sertliği en yüksek olan C kodlu numunesinde gerçekleşmiştir. Buna göre 25x103, 50x103 ve 75x103 çevrim sayısındaki C kodlu numuneye karşılık gelen değerler sırasıyla, 0,002130, 0,004266 ve 0,004718 cm3’dür. Farklı sıcaklıklarda presleme işlemi yapılan A, B ve C numunelerinin aşınma yüzeylerinin, aşınma parçacıklarının ve bilye yüzeylerinin benzer görüntü sergilediği belirlenmiştir. Buna göre aşınma yüzeyleri sıvama tabakalarının ve soyulmalardan, aşınma parçacıkları irili ufaklı tozlardan bilye yüzeylerinin ise sıvama tabakalarından meydana geldiği gözlenmiştir.

Metal matrix composites are increasingly being recognized as new wear-resistant materials. The main purpose of this study is to investigate the microstructure, mechanical properties, and wear resistance of Al-Cu-Mg alloy matrix composites reinforced with high contents of Al2O3 particles. Moreover, the effects of 10, 20, and 40 wt% Al2O3 contents on the microstructure, mechanical properties, and dry wear resistance of the Al-Cu-Mg matrix composites are studied. The results show that the theta (CuAl2) phase ratio increases with increasing Al2O3 contents. The hardness values of the samples also increase with increasing Al2O3 contents. The highest tensile and flexural strengths are measured as 284 and 562.9 MPa, respectively, and these values are obtained for the composite material reinforced with 10 wt% Al2O3 particles. The continuous increase in the hardness of the samples with increasing Al2O3 content may cause the lowest volume loss for the 40 wt% Al2O3-reinforced composite. The friction surfaces show that the wear surfaces comprise adhesion, delamination, and smear layers. Overall, compared to the Al2O3-reinforced composite samples, pure Al-Cu-Mg alloy samples show approximately 2 times more mass gain.

Bu çalışmada, sıcak presleme yöntemi kullanılarak üretilen ve farklı presleme sıcaklıklarında yoğunlaştırılan AlSi10Mg alaşımının mikroyapısı ve mekanik özelliklerinin incelenmesi araştırılmıştır. Bu amaçla AlSi10Mg alaşımı numunelerine soğuk presleme (N0) ve 450 oC (N1), 500 oC (N2), 550 oC (N3) sıcaklarında sıcak presleme işlemi uygulanmıştır. Soğuk presleme yapılan N0 numunesindeki porozite miktarının N1, N2 ve N3 numunelerine göre yüksek olduğu ve artan sıcaklıkla yoğunluk değerlerinin arttığı, porozite miktarının ise azaldığı belirlenmiştir. Ayrıca, içyapı incelemelerinde artan sıcaklıkla birlikte içyapıdaki silisyum (Si) parçacıklarının giderek küreselleştiği ve yapı içerişe homojen bir şekilde dağıldığı gözlenmiştir. Buna göre, N0, N1, N2 ve N3 kodlu numunelerde en yüksek sertlik değerini yaklaşık %45’lik artış sergileyen N3 numunesi göstermiştir. Çekme dayanım değerlerinde ise en yüksek çekme dayanım değeri N3 numunesinde 186 MPa olarak, en düşük çekme dayanım değeri ise N1 numunesinde 156 MPa olarak belirlenmiştir. Buna göre N3 numunesi N1 numunesine göre %20 oranında daha yüksek çekme dayanımı performansı sergilemiştir. Numunelere uygulanan bütün pres sıcakları için çekme ve darbe kırılma yüzeylerinin yarılma düzlemlerinden ve yırtılma sırtlarından oluştuğu belirlenmiştir. Ayrıca, çekme ve darbe deneylerinden elde edilen kırılma yüzeylerinde, artan presleme sıcaklığı ile sertliğin artmasından dolayı yarılma düzlemlerinin genişliklerinin arttığı tespit edilmiştir.

Bu çalışmada, sıcak presleme yöntemi kullanılarak üretilen ve farklı presleme sıcaklıklarında yoğunlaştırılan AlSi10Mg alaşımının mikroyapısı ve mekanik özelliklerinin incelenmesi araştırılmıştır. Bu amaçla AlSi10Mg alaşımı numunelerine soğuk presleme (N0) ve 450 oC (N1), 500 oC (N2), 550 oC (N3) sıcaklarında sıcak presleme işlemi uygulanmıştır. Soğuk presleme yapılan N0 numunesindeki porozite miktarının N1, N2 ve N3 numunelerine göre yüksek olduğu ve artan sıcaklıkla yoğunluk değerlerinin arttığı, porozite miktarının ise azaldığı belirlenmiştir. Ayrıca, içyapı incelemelerinde artan sıcaklıkla birlikte içyapıdaki silisyum (Si) parçacıklarının giderek küreselleştiği ve yapı içerişe homojen bir şekilde dağıldığı gözlenmiştir. Buna göre, N0, N1, N2 ve N3 kodlu numunelerde en yüksek sertlik değerini yaklaşık %45’lik artış sergileyen N3 numunesi göstermiştir. Buna ilaveten N0, N1, N2 ve N3 numunelerinin yoğunluk değerleri sırasıyla 2.3523, 2.6165, 2.6191 ve 2.6287 gr/cm3 olarak belirlenmiştir. Çekme dayanım değerlerinde ise en yüksek çekme dayanım değeri N3 numunesinde 186 MPa olarak, en düşük çekme dayanım değeri ise N1 numunesinde 156 MPa olarak belirlenmiştir. Buna göre N3 numunesi N1 numunesine göre %20 oranında daha yüksek çekme dayanımı performansı sergilemiştir. Numunelere uygulanan bütün pres sıcakları için çekme ve darbe kırılma yüzeylerinin yarılma düzlemlerinden ve yırtılma sırtlarından oluştuğu belirlenmiştir. Ayrıca, çekme ve darbe deneylerinden elde edilen kırılma yüzeylerinde, artan presleme sıcaklığı ile sertliğin artmasından dolayı yarılma düzlemlerinin genişliklerinin arttığı tespit edilmiştir.

In the study, the effect of laser energy density and post-processes (sintering, cold rolling, and hot rolling) on the properties of Co-Cr-Mo-W alloys fabricated by selective laser melting (SLM) are investigated. The samples are fabricated at 83, 125, and 167J/mm3 of laser energy density to compare their properties. XRD results show that the samples in which ε-Co martensitic phase dominates γ-Co phase are the samples exposed to hot rolling. The highest hardness values obtained with the hot rolling applied after SLM. The hardness for SLM1hr, SLM2hr and SLM3hr is 489.2, 500.4 and 509.8 HV, respectively. The lowest wear rate values are also obtained after the hot rolling post-process, where the highest hardness values and lowest average COFs were obtained.