scholarly journals Fe–Si–Al Coatings with Stable Wear Resistance Prepared by Laser Cladding Industrial Wastes

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 96 ◽  
Author(s):  
Xue Liu ◽  
Bin-Bin Ma ◽  
Li-Wei Hu ◽  
Jin-Feng Li ◽  
Feng-Sheng Qu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Laser Cladding ◽  
Low Cost ◽  
Industrial Wastes ◽  
Solid Solution Phase ◽  
Steel Matrix ◽  
Wear Resistant Coatings ◽  
Low Mass ◽  
Columnar Grain

Because wear is one of the most common reasons for the failure of metals, the development of a low-cost coating with enhanced wear resistance is of great importance. In the present study, Fe–Si–Al coatings with superior and stable wear resistance were prepared by laser cladding Fe–Si–Al industrial waste onto 1045 carbon steel. The microstructure, as well as the wear mechanism of the Fe–Si–Al coatings, was investigated. The Fe–Si–Al coatings consist of a (Al, Fe, Si) solid solution phase in both columnar grain form and equiaxed grain form. The Fe–Si–Al coatings possess enhanced microhardness of 494 ± 15 HV0.3 and low mass loss of 5 × 10−5 mg·(N·m)−1. The wear resistance is ten times higher than that of the 1045 carbon steel matrix. The wear of the Fe–Si–Al coatings is mainly dominated by abrasive wear and adhesive wear. This work provides important insight into the preparation of low-cost, wear-resistant coatings, as well as stable, superior wear resistance.

scholarly journals Crack Restraining Methods and their Effects on the Microstructures and Properties of Laser Cladded WC/Fe Coatings

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2541 ◽  
Author(s):  
Qiu-Lian Dai ◽  
Can-bin Luo ◽  
Fang-yi You
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Low Cost ◽  
Annealing Treatment ◽  
Melting Process ◽  
Laser Cladding Process ◽  
Process Heat ◽  
Crack Susceptibility ◽  
Better Than

Laser cladded WC/Fe coatings have the advantages of low cost and high abrasion wear resistance. However, cracks always appear in WC/Fe coatings, which limits their industrial application. In this paper, the co-effects of the re-melting process, heat treatments, and amount of Co element on the cracking susceptibility, microstructures, and mechanical properties of WC/Fe laser cladding coatings were studied. Experimental results show that re-melting process is helpful to improve the surface quality of the coating and to reduce the cracking susceptibility. The hardness of the coating decreases slightly but distributes more uniformly. Cracks in the coating can be inhibited effectively by preheating the substrate to 250 °C and maintaining the temperature during the laser cladding process, as well as applying an annealing treatment at 300 °C for 1 h. Heat treatment also results in a slight decrease in the hardness. Crack initiation cannot be restrained completely by applying the above two methods when laser cladding a big area of coating. On the basis of the above two methods, addition of Co element to the coating can further improve its toughness and decrease the crack susceptibility. Crack-free WC/Fe coating can be manufactured when 8% Co is added, and its wear resistance is much better than that of the hardened medium steel, especially when the wear time is long.

IN SITU SYNTHESIS OF TiC–TiB2 REINFORCED FeCrSiB COMPOSITE COATING BY LASER CLADDING

2007 ◽  
Vol 14 (02) ◽  
pp. 315-319 ◽  
Author(s):  
BAOSHUAI DU ◽  
ZENGDA ZOU ◽  
XINHONG WANG ◽  
QINGMING LI
Keyword(s):  
Wear Resistance ◽  
Chemical Composition ◽  
Carbon Steel ◽  
Laser Cladding ◽  
Metal Matrix ◽  
In Situ Synthesis ◽  
Mild Carbon Steel ◽  
Measurement Results ◽  
Iron Based

TiC and TiB 2 reinforced iron based metal matrix composite (MMC) coating was synthesized on mild carbon steel by laser cladding employing B 4 C , ferrotitanium, and FeCrSiB mixed powders. The microstructure and chemical composition were analyzed by means of SEM, EPMA, and XRD. Results show that the coating mainly consists of α– Fe(Ni) , TiB 2, TiC , B 6 Fe 23, Cr 2 B , and M 23 C 6. TiB 2, and TiC reinforcements are formed in situ through the reaction between B 4 C and ferrotitanium. Hardness and wear measurement results show that the hardness and wear resistance of the composites are much higher than that of the as-received sample.

The Effect of Relative Thickness on Microstructures of TiB2/TiC Particles Reinforced Carbon Steel Matrix Surface Composite

2014 ◽  
Vol 940 ◽  
pp. 3-6
Author(s):  
Chang Qing Guo
Keyword(s):  
Carbon Steel ◽  
Low Cost ◽  
Compound Layer ◽  
Steel Matrix ◽  
Surface Compound ◽  
Relative Thickness ◽  
Surface Composite ◽  
High Temperature Synthesis ◽  
Matrix Surface ◽  
The Matrix

This paper introduces a process that combines a vacuum expandable pattern casting V-EPC with self-propagation high–temperature synthesis SHS of TiB2/TiC particles for fabricating the TiB2/TiC duplex particulates reinforced carbon steel matrix surface composite, and the effect of relative thickness δ on metallurgical quality and microstructures. FeTi-FeB-FeCr system with low cost is adopted as the SHS reactant. Experimental results show that with increasing δ, the surface composite is gradually formed and the metallurgical quality improved. The typical microstructures of the composite from surface to core are consisted of three different layers, i.e., the surface compound layer, the interim transitional layer and the carbon steel base. A certain amount of fineTiB2/TiC particles is distributed in the matrix of the surface compound layer.

Microhardness and wear resistance of Al2O3-TiB2-TiC ceramic coatings on carbon steel fabricated by laser cladding

2019 ◽  
Vol 45 (1) ◽  
pp. 115-121 ◽  
Author(s):  
Zhaoliang Li ◽  
Mumeng Wei ◽  
Kui Xiao ◽  
Ziheng Bai ◽  
Wei Xue ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Laser Cladding ◽  
Ceramic Coatings

Microstructure and Wear Response of Ni/SiC Laser Cladding Composite Coatings on a Carbon Steel

2008 ◽  
Vol 373-374 ◽  
pp. 375-378 ◽  
Author(s):  
Bai Yang Lou ◽  
Bing Xu ◽  
Y.B. Zhou ◽  
W.J. Bai ◽  
H.L. Du
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Base Material ◽  
High Energy ◽  
Bonding Layer ◽  
Strengthening Effect ◽  
Sic Particles ◽  
Powder Feeding

The high-energy laser melts the cladding materials which coagulate onto the surface of the base materials. The laser cladding coatings are produced mainly in two methods: powder feeding and prefabricating. The grain-strengthening composite coatings could be formed more easily by prefabricating method than by powder feeding method. In this paper, Ni/SiC ceramic composite coating on carbon steel (45 steel) was made by prefabricating method. The microstructure and wear-resistance of Ni/SiC cladding coating on the 45 steel were studied using scanning electronic microscope (SEM) and wear test. The results showed that the microstructure of cladding coatings included bonding layer, thermo-affected layer and heat-affected layer after laser cladding. The microstructure of cladding coating was mainly of dendrite and cell-like crystals. The resultant multilayered coating had excellent adherence with the base steel. The addition of SiC particles into cladding coatings significantly reinforced the microhardness of laser cladding coating. Compared with Ni60A cladding coating, Ni60A/SiC cladding coating had high microhardness, which was attributed to not only the dispersion intensification effect of the SiC particle, but also by the new complicated phases. During laser cladding process, SiC particles may decompose and dissolve into the coating and result in solid solution strengthening effect which increases the microhardness of the composite coatings. The base material and Ni-based laser cladding coatings with and without SiC were tested to assess the wear-resistance property. The test results demonstrated that the laser cladding coatings had better wear resistance than the base material. Furthermore, the laser cladding coating with SiC particles had higher wear-resistance than the coating without SiC.

scholarly journals Influence of Scanning Speed on Microstructure and Properties of Laser Cladded Fe-Based Amorphous Coatings

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1279 ◽  
Author(s):  
Xiangchun Hou ◽  
Dong Du ◽  
Baohua Chang ◽  
Ninshu Ma
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Scanning Speed ◽  
Amorphous Coating ◽  
X Ray Diffraction ◽  
Wear Resistant Coatings ◽  
Electron Probe Microanalyzer ◽  
Cladding Layer ◽  
Grain Structures ◽  
Steel Substrates

Fe-based amorphous alloys with excellent mechanical properties are suitable for preparing wear resistant coatings by laser cladding. In this study, a novel Fe-based amorphous coating was prepared by laser cladding on 3Cr13 stainless steel substrates. The influence of scanning speeds on the microstructures and properties of the coatings was investigated. The microstructure compositions and phases were analyzed by scanning electron microscope, electron probe microanalyzer, and x-ray diffraction respectively. Results showed that the microstructures of the coatings changed significantly with the increase of scanning speeds. For a scanning speed of 6 mm/s, the cladding layer was a mixture of amorphous and crystalline regions. For a scanning speed of 8 mm/s, the cladding layer was mainly composed of block grain structures. For a scanning speed of 10 mm/s, the cladding layer was composed entirely of dendrites. Different dilution rates at the bonding zones were the main reasons for the microstructure change for different claddings. For all three scanning speeds, the coatings had higher hardness and wear resistance when compared with the substrate; as the scanning speed increased, the hardness and wear resistance of the coatings gradually decreased due to the change in microstructure.

scholarly journals Microstructure and Wear Behavior of Laser Cladded Ni45 + High-Carbon Ferrochrome Composite Coatings

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1611
Author(s):  
Jiayang Gu ◽  
Ruifeng Li ◽  
Shungao Chen ◽  
Yuhao Zhang ◽  
Shujin Chen ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Wear Behavior ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Solid Solution Phase ◽  
High Carbon ◽  
Carbon Ferrochrome ◽  
1045 Steel

A composite coating with enhanced mechanical properties including high hardness and excellent wear resistance was produced by laser cladding of mixed Ni45 and high-carbon ferrochrome powders on an ASTM 1045 steel substrate. Different quantities, ranging from 10 to 50 wt.% of high-carbon ferrochrome powder were added to the Ni45 powder to investigate the effect of mixture content on the cladding performance. The microstructure of the coatings were examined using scanning electron microscope, and the wear resistance was compared using a wear tester apparatus among the different cases. The results showed that the microstructure of the coating with 30 wt.% high-carbon ferrochrome content was mainly fine solid solution phase. With the increase of high-carbon ferrochrome content to 40 wt.% and above, cracks appeared on the cladding surface due to a large amount of chromium carbides formed during the process. The microhardness was enhanced remarkably by laser cladding the composite coating on the 1045 substrate, with 2.4 times higher than the hardness of the substrate when 30 wt.% high-carbon ferrochrome content was added. The best wear performance was achieved when the high-carbon ferrochrome content was 30 wt.%, demonstrating the smallest surface roughness and depth of wear marks. With further increased high-carbon ferrochrome content, microcracking and delamination were observed on the worn surfaces.

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

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 622 ◽  
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.

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