scholarly journals Effects of Graphite Particle Size on Microstructure and Properties of In-situ Ti-V Carbides Reinforced Fe-based Laser Cladding Layers

2019 ◽  
pp. 2208-2215 ◽  
Author(s):  
Hui Zhang ◽  
Keyword(s):  
Particle Size ◽  
Laser Cladding ◽  
Graphite Particle ◽  
Microstructure And Properties ◽  
Cladding Layers

Study on Microstructure of Laser In Situ Formation of TiBX and TiC Titanium Composite Coatings

2011 ◽  
Vol 686 ◽  
pp. 646-653 ◽  
Author(s):  
Jing Liang ◽  
Sui Yuan Chen ◽  
Chang Sheng Liu ◽  
Feng Hua Liu
Keyword(s):  
Laser Cladding ◽  
Composite Coatings ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Pulse Frequency ◽  
Hexagonal Prism ◽  
Disperse Particles ◽  
The Matrix ◽  
Cladding Layers

Two kinds of mixed powders:Ti-6Al-4V/B/C and Ti-6Al-4V/B4C which are pre-pasted or synchronized fed on Ti-6Al-4V substrates separately were scanned by a 500W pulsed YAG laser to induce in situ formation of titanium composite coatings contained TiBxand TiC ceramic reinforced phases. The influences of laser processing parameters including Pulse Frequency (PF), Pulse Width (PW), Laser Power (P) and Scanning Speed (V) together with the powder proportions on the microstructure and properties of the coatings were investigated. Microstructures, phase components of the coating were analyzed by OM, SEM, TEM and XRD respectively. Experimental results show that two and more kinds of ceramic reinforcements were in situ formatted in the matrix of Ti-6Al-4V. TiB and TiC ceramics were formed evenly with the morphology of needle, tiny dendrites and disperse particles in the prepasted single path specimens. For the powder feed laser cladding layers, the ceramic reinforcements were TiB (needlelike), TiB2(hexagonal prism or rodlike), a small amount of TiC (disperse particles) and non fully reacted B4C. The microhardness increased with the increase of the amount of B4C and B+C additions. When the added B and C contents are the same, the microhardness of the coating with B4C addition is higher than that of the coating with B+C addition. The average micro-hardness of a powder prepasted (with 20 wt.% B4C addition) multi-path laser cladding layer formed under the optimized processing parameters is up to 800HV, which is more than 2 times of that of the substrate (340Hv), and the wear weight loss of the layer decreased nearly 3 times that of the substrate.

scholarly journals Influence of Graphene Sheet on Microstructure and Properties of Ni-based Alloy Coatings Prepared by Laser Cladding

2019 ◽  
Vol 25 (3) ◽  
pp. 252-258
Author(s):  
Geng TIANYUAN ◽  
Cunshan WANG
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Graphene Sheet ◽  
Laser Cladding ◽  
Steel Substrate ◽  
Diffusion Reaction ◽  
Forming Quality ◽  
Volume Fractions ◽  
Microstructure And Properties ◽  
Cladding Layers

Ni-based alloy cladding layers with different graphene sheet additions were prepared by laser cladding on the 40CrNi2Si2MoV steel substrate. The influence of the graphene sheet on the microstructure and properties of the cladding layers was investigated. The results show that owing to the diffusion-reaction dissolution, the graphene sheet addition does not bring a corresponding change in the phase constitutions of the cladding layers, i. e., the cladding layers are still composed of γ-Ni, Ni3B, and M7C3 phases. But what has changed is that the solidified structure is refined, and the volume fractions of the eutectic and the carbide are increased with the increase of graphene sheet addition. As a result, the hardness and the wear resistance of the cladding layers gradually increase, whereas the friction coefficient firstly decreases and then increases, with the lowest friction coefficient obtained at 0.5 vol.% graphene sheet addition. Compared to the Ni-based alloy cladding layers with micro-size graphite additions, the studied cladding layers exhibit improved hardness and wear resistance, good forming quality, and increased friction coefficient. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.19173

Effect of Laser Remelting on Microstructure and Properties of In-Situ Coating by Laser Cladding on TC4 Titanium Alloy

2012 ◽  
Vol 49 (4) ◽  
pp. 041403
Author(s):  
林英华 Lin Yinghua ◽  
李月华 Li Yuehua ◽  
陈志勇 Chen Zhiyong ◽  
朱卫华 Zhu Weihua ◽  
文向东 Wen Xiangdong ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Laser Cladding ◽  
Laser Remelting ◽  
Microstructure And Properties ◽  
Tc4 Titanium Alloy ◽  
In Situ Coating

scholarly journals Comparative Study on the Dry Sliding Friction Properties of In-Situ Micron and Submicron (Ti-V)C Reinforced Fe-Based Laser Cladding Layers

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 742 ◽  
Author(s):  
Yunpeng Liu ◽  
Hui Zhang ◽  
Guangchun Xiao ◽  
Wei Zhao ◽  
Hui Xu
Keyword(s):  
Plastic Deformation ◽  
Laser Cladding ◽  
Sliding Friction ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Cladding Layer ◽  
Average Grain Size ◽  
Dry Sliding Friction ◽  
Cladding Layers

By optimising the particle size of cladding alloy powders, in situ micron and submicron (Ti-V)C reinforced Fe-based laser cladding layers were prepared and the dry sliding friction properties were comparatively studied. Results showed that there were same phases of α-Fe, γ, TiC, and TiVC2 in the two cladding layers. The average grain size of the Fe-based matrix was 3.46 μm and 3.37 μm, the microhardness was 731 HV0.2 and 736 HV0.2, and the area ratio of carbides was 11.14% and 11.02%, respectively. The dry sliding wear resistance of the cladding layer reinforced by 1.95 μm carbides was 2.76 times higher than that of the 0.49 μm carbides. The failure mechanism of the cladding layer with the micron carbides was mainly caused by plastic deformation of the cladding layer matrix, whereas that of the submicron carbides involved both the plastic deformation of the cladding layer matrix and the abrasion that was caused by the peeled carbides.

Microstructure and properties of in-situ synthesized Ni3Ta-TaC reinforced Ni-based coatings by laser cladding

2021 ◽  
Vol 405 ◽  
pp. 126599
Author(s):  
Dengwen Hu ◽  
Yan Liu ◽  
Hui Chen ◽  
Mengchao Wang ◽  
Jin Liu
Keyword(s):  
Laser Cladding ◽  
Microstructure And Properties
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