WC Particles Reinforced Co-Based Alloy Coatings Produced by Laser Cladding

To extend the service life of hot die steel (H13), WC particles reinforced Co-based alloy composite coatings were produced by laser cladding. The microstructure evolution and performance of the cladding layer were investigated. The experiment results showed that there existed fine dendritic crystals and dispersive WC particles in the cladding layer. The coatings were mainly composed of γ-Co, WC and Co3W3C phases. The microhardness of the cladding layer was higher than that of the arc surfacing layer, and the microhardness gradually increased with WC content. Compared to the substrate, the friction coefficient of the cladding layer reduced greatly. The coatings with 15wt.% WC possess the best wear resistance.

Download Full-text

Microstructure evolution of Ni-Mo-Fe-Si quaternary metal silicide alloy composite coatings by laser cladding on pure Ni

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2019.01.191 ◽

2019 ◽

Vol 785 ◽

pp. 984-1000 ◽

Cited By ~ 8

Author(s):

Peilei Zhang ◽

Mingchuan Li ◽

Hua Yan ◽

Jieshi Chen ◽

Zhishui Yu ◽

...

Keyword(s):

Laser Cladding ◽

Microstructure Evolution ◽

Composite Coatings ◽

Metal Silicide ◽

Alloy Composite

Download Full-text

THE INFLUENCE OF TECHNOLOGICAL PARAMETERS OF LASER SURFACING ON THE PROPERTIES OF NiCrBSiC-WC COMPOSITES

Тонкие химические технологии ◽

10.32362/2410-6593-2018-13-4-58-66 ◽

2018 ◽

Vol 13 (4) ◽

pp. 58-66

Author(s):

A. E. Zatoka ◽

D. V. Drobot ◽

S. P. Merchev ◽

S. V. Nevezhin ◽

A. S. Gerasimov ◽

...

Keyword(s):

Wear Resistance ◽

Service Life ◽

Tungsten Carbide ◽

Laser Cladding ◽

Composite Coatings ◽

Tungsten Carbides ◽

Technological Parameters ◽

Carbide Composite ◽

Measurement While Drilling ◽

Mechanical And Service Properties

It was investigated the influence of technological parameters of laser cladding on the thickness of the carbide composite coatings with similar composition and properties of matrix and different types of reinforcing inclusions (spherical tungsten carbides (WC) and recycled carbides). Special attention is paid to physical-mechanical and service properties of the composites such as hardness and resistance to abrasive wear. It is established that the thickness of the carbide composite coatings increases with increasing laser power and flow rate of the carrier gas, and with decreasing speed of the laser and the step of cladding. The study showed that at the addition of 50 wt.% WC matrix has smaller hardness values 540-560 HV, which allows to obtain the structure of the carbide composite coatings without cracks. At the same time, at addition of 80 wt.% WC matrix has higher hardness 670 HV, which does not provide the structure without cracks. Resistance of composites NiCrBSiC-WC to cracking, as well as their wear resistance, increases with increasing content of tungsten carbide. The wear resistance of the coatings received from powder Technicord 655-SL, with a reinforcement by recycled carbide, comparable to that for coatings from spherical tungsten carbide Tekmat WC-125. Coatings NiCrBSiCWC, obtained by laser cladding, are used to increase the service life of the equipment telemetering systems, in particular, it is possible to prevent of abrasion and provide of increasing the service life of the contact pads of the equipment for measurement while drilling.

Download Full-text

Effect of CeO2 on Microstructure and Properties of WC/Ni60 Coating by Laser Cladding

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.795 ◽

2009 ◽

Vol 79-82 ◽

pp. 795-798 ◽

Cited By ~ 2

Author(s):

Hong Ye ◽

X.B. Zhang ◽

Z.F. Xue ◽

Y.H. Fan ◽

Ke Chen

Keyword(s):

Wear Resistance ◽

Corrosion Resistance ◽

Intermetallic Compounds ◽

Laser Cladding ◽

Rare Earths ◽

Composite Coatings ◽

Alloy Matrix ◽

Fine Crystal ◽

Cladding Layer ◽

Strengthen Effect

The composite coatings of self-flux alloy matrix reinforced by WC-12%Co were produced on the surface of 45 steel using laser cladding technology. The effects of CeO2 to macro-morphology, microstructure, hardness, wear resistance and corrosion resistance of cladding layer were investigated. The results show that rare earths oxide (CeO2) added laser cladding coating has distribution, dimension phases and less deficiency. CeO2 could promote liquating process of WC, increasing the quantity and distribute uniformity of intermetallic compounds in laser cladding layer. Because of dispersion precipitation and fine-crystal strengthen effect, laser cladding layer with CeO2 has higher microhardness, wearing resistance and better corrosion resistance properties.

Download Full-text

Effects of Cu-Coated SiC Content on Microstructure and Properties of Laser Cladding SiCp/Al–Si Composite Coatings

Materials ◽

10.3390/ma12091537 ◽

2019 ◽

Vol 12 (9) ◽

pp. 1537 ◽

Cited By ~ 2

Author(s):

Yang Liu ◽

Guodong Li ◽

Wenting Jiang

Keyword(s):

Wear Resistance ◽

Laser Cladding ◽

Composite Coatings ◽

Ternary Eutectic ◽

Powder Mixtures ◽

Cu Content ◽

Cladding Layer ◽

Primary Si ◽

Sic Particles ◽

Electroless Copper

SiC particles (SiCp)-reinforced Al–Si matrix composite coatings were synthesized on 4032 aluminum alloy by laser cladding using powder mixtures of Al-20 wt.% Si alloy and electroless copper-plated SiC particles (SiCp-Cu). The effects of SiCp-Cu content on microstructure, phase composition, and microhardness of the SiCp/Al–Si laser cladding layer (LCL) were investigated systematically. The results showed that the microstructure of SiCp-Cu/Al–Si LCL was mainly composed of undissolved SiCp, lump-like primary Si, lump-like Al2Cu, plate-like Al4SiC4, and Al–Si–Cu ternary eutectic. In addition, the eutectic microstructure became finer with the increasing of SiCp-Cu content. The average microhardness of the LCL increased with the increasing of SiCp-Cu content. When SiCp-Cu content was 50 wt.%, the average microhardness of the LCL reached 508 HV0.05, which was about 3.5 times larger than that of the substrate. The LCL reinforced with a SiCp-Cu content of 30 wt.% exhibits the best wear resistance.

Download Full-text

Wear Behaviors of TiN/WS2 + hBN/NiCrBSi Self-Lubricating Composite Coatings on TC4 Alloy by Laser Cladding

Coatings ◽

10.3390/coatings10080747 ◽

2020 ◽

Vol 10 (8) ◽

pp. 747

Author(s):

Kaiwei Liu ◽

Hua Yan ◽

Peilei Zhang ◽

Jian Zhao ◽

Zhishui Yu ◽

...

Keyword(s):

Wear Resistance ◽

Friction Coefficient ◽

Composite Coating ◽

Laser Cladding ◽

Sliding Wear ◽

Composite Coatings ◽

Wear Test ◽

Dry Sliding Wear ◽

X Ray ◽

Tc4 Alloy

TiN and WS2 + hBN reinforced Ni-based alloy self-lubricating composite coatings were fabricated on TC4 alloy by laser cladding using TiN, NiCrBSi, WS2, and hBN powder mixtures. Energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and optical microscopy (OM) were adopted to investigate the microstructure. The wear behaviors of the self-lubricating composite coatings were evaluated under large contact load in room temperature, dry-sliding wear-test conditions. Results indicated that the phases of the coatings mainly include γ-Ni, TiN, TiNi, TiW, WS2, and TiS mixtures. The average microhardness of the composite coating is 2.3–2.7 times that of the TC4 matrix. Laser cladding TiN/WS2 + hBN/NiCrBSi self-lubricating composite coatings revealed a higher wear resistance and lower friction coefficient than those of the TC4 alloy substrate. The friction coefficient (COF) of the coatings was oscillating around approximately 0.3458 due to the addition of self-lubricant WS2 + hBN and hard reinforcement TiN. The wear behaviors testing showed that the wear resistance of the as-received TC4 was significantly improved by a laser cladding TiN/WS2 + hBN/NiCrBSi self-lubricating composite coating.

Download Full-text

Wear Properties of TiC-Reinforced Co50 Composite Coatings from Room Temperature to High Temperature

Advances in Materials Science and Engineering ◽

10.1155/2020/6849081 ◽

2020 ◽

Vol 2020 ◽

pp. 1-21

Author(s):

Nga Thi-Hong Pham ◽

Van-Thuc Nguyen

Keyword(s):

Wear Resistance ◽

Friction Coefficient ◽

Laser Cladding ◽

Wear Mechanism ◽

Room Temperature ◽

Steel Substrate ◽

Composite Coatings ◽

H13 Steel ◽

Fatigue Wear ◽

Wear Rates

In this paper, the laser cladding is created by using Co50 powder and TiC mixture, covering a H13 hot-working steel substrate. The samples are analyzed by the hardness test, XRD, SEM, and friction test to identify the forming phases, microhardness distribution, and wear-resistant characteristics. The results indicated that hardness reduces from the coating zone to the substrate, achieving the highest value at the coating zone. Increasing the content of TiC results in improving the coating hardness. The coatings with 10%–20% TiC show high-quality surface morphology and macrograph. With 30% TiC, the hardness obtains a higher hardness, but the surface appears to crack. The microstructures of the coatings present a well-mixed and well-distribution of the TiC particle on the Co matrix. The friction coefficient of H13 steel and Co50 coating reaches the maximum value when the load is 50 N and mostly decreases with the increase in the load. The wear rates of H13 steel and Co50 coatings mainly increase with the increase in the load. The temperature has a greater influence on the friction coefficient of the Co50 coating. However, the temperature has a small effect on the friction coefficient of the 20% TiC coating. The wear resistance of 20% TiC coating is higher than that of H13 steel, Co50 coating, and 10% TiC composite coating. At room temperature, the wear mechanism of the coating is mainly brittle spalling, adhesive wear, and ploughing. At 700°C, the wear mechanism is mostly oxidation wear and fatigue wear. After laser cladding, the service life of the coated surface could be greatly improved. The Co + 20% TiC coating has high hardness and wear resistance.

Download Full-text

Microstructure and Properties of WC/diamond/Co-based Gradient Composite Coatings on High-speed Steel Fabricated by Laser Cladding

10.21203/rs.3.rs-638436/v1 ◽

2021 ◽

Author(s):

Donggang Liu ◽

Guoxing Liang ◽

Xinhui Hao ◽

Yonggui Huang ◽

Guang Li ◽

...

Keyword(s):

Wear Resistance ◽

Corrosion Resistance ◽

Laser Cladding ◽

Polarization Resistance ◽

Alloy Powder ◽

High Speed ◽

Composite Coatings ◽

High Speed Steel ◽

Wear Loss ◽

Cladding Layer

Abstract Improving the wear resistance and corrosion resistance of high-speed steel (HSS), WC/diamond/Co-based gradient composite coatings were produced on HSS substrates by laser cladding with different compositions powder mixture (Co-Cr alloy powder, 80Co-Cr alloy powder+20WC, 53Co-Cr alloy powder+40WC+7diamond, wt.%). The macromorphology, microstructures and phase composition were characterized by optical microscope (OM), scanning electron microscopy (SEM) equipped with energy dispersion spectrometry (EDS), and X-ray diffraction (XRD) techniques. The microhardness, wear resistance and corrosion resistance of the gradient coatings were also investigated respectively. The results indicate that the prepared WC/diamond/Co-based gradient composite cladding layer has a fine morphology on the cross sections and a gradient transition of the grain size has been achieved. The microhardness result presents gradient distribution along the depth of the coating. The microhardness is strengthened due to the dispersions of M7C3 (M is Fe, Cr), Co3C, CrCo, Cr3C2, Fe3C in the composite coating, and the highest microhardness of 1342 HV0.2 can be detected in the cladding layer. The friction coefficient values of the coatings range from 0.27 to 0.40, which is much lower than that of the substrate (0.50-0.60). Furthermore, the wear loss of coatings decreases by more than 3 times comparing with that of the substrate (3.5 mg). The polarization resistance results show that the cladding layer has excellent corrosion resistance with polarization resistance can reach the value of 236488.1 Ω·cm2. The gradient transition of the mechanical properties and chemical metallurgical combination between particle (WC, diamond) and adhesive phase can be obtained in laser cladding, which improves the wear resistance and corrosion resistance of the HSS surface.

Download Full-text

Microstructure and Wear Resistance of Fe-Cr-Mo-Co-C-B Amorphous Composite Coatings Synthesized by Laser Cladding

Metals ◽

10.3390/met8080622 ◽

2018 ◽

Vol 8 (8) ◽

pp. 622 ◽

Cited By ~ 11

Author(s):

Xiangchun Hou ◽

Dong Du ◽

Kaiming Wang ◽

Yuxiang Hong ◽

Baohua Chang

Keyword(s):

Stainless Steel ◽

Wear Resistance ◽

Laser Cladding ◽

Steel Substrate ◽

Composite Coatings ◽

Amorphous Region ◽

X Ray Diffraction ◽

Cladding Layer ◽

Amorphous Alloy Powder ◽

Columnar Grain

A novel amorphous composite coating was synthesized successfully on 3Cr13 stainless steel by laser cladding Fe-Cr-Mo-Co-C-B amorphous alloy powder. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) were used to analyze the microstructure, composition, and phase structure of the coatings. Hardness and friction wear testers were used to analyze the hardness and wear resistance of the coatings. Results show that the cladding layer has an amorphous/crystalline composite structure, which is composed of a columnar grain region at the bottom and an amorphous region in the upper layer. The solute redistribution between the coating and the substrate in the bonding zone and the lower cooling rate at bottom account for the occurrence of crystallization. The highest hardness of the cladding layer is 1179 HV0.5, which is about 6 times that of the 3Cr13 stainless steel substrate (200 HV0.5). The cladding layer greatly improves the wear resistance of the substrate with a much lower coefficient of friction and wear mass loss compared with the substrate.

Download Full-text