Microstructure of Laser In Situ Synthesized TiBx+TiC Reinforced Composite Coatings

2014 ◽  
Vol 1061-1062 ◽  
pp. 526-529
Author(s):  
Jing Liang ◽  
Chao Wang ◽  
Sui Yuan Chen ◽  
Chang Sheng Liu ◽  
Cheng Yu Yang
Keyword(s):  
Laser Scanning ◽  
Composite Coatings ◽  
Scanning Speed ◽  
Processing Parameters ◽  
In Situ Synthesis ◽  
Optimal Processing ◽  
Reinforced Composite ◽  
The Matrix ◽  
Laser Scanning Speed

B4C/TiNi mixed powders with different composition (10B4C+90TiNi and 20B4C+80TiNi in wt. %) prepasted on Ti-6Al-4V substrates were scanned by a FL-Dlight02-3000W semiconductor laser to obtain TiBx+TiC reinforced graded composite coatings. The influences of the processing parameters on the microstructure of the coatings were studied. Optimal processing parameters were obtained with laser power (P) 1700W/1900W, laser scanning speed (V) 6.67mm/s and defocus length 310mm. The microstructures and phases of the coatings were analyzed with OM, SEM and XRD respectively. Graded composite coatings with in-situ synthesis of TiC, TiB and TiB2 reinforcements in the matrix of Ti2Ni and TiNi were obtained.

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 In Situ Mo(Si,Al)2-Based Composite through Selective Laser Melting of a MoSi2-30 wt.% AlSi10Mg Mixture

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3720 ◽  
Author(s):  
Tatevik Minasyan ◽  
Sofiya Aydinyan ◽  
Ehsan Toyserkani ◽  
Irina Hussainova
Keyword(s):  
High Temperature ◽  
Selective Laser Melting ◽  
Laser Power ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Laser Melting ◽  
Structural Applications ◽  
Laser Scanning Speed ◽  
Fusion Approach

The laser power bed fusion approach has been successfully employed to manufacture Mo(Si,Al)2-based composites through the selective laser melting of a MoSi2-30 wt.% AlSi10Mg mixture for high-temperature structural applications. Composites were manufactured by leveraging the in situ reaction of the components during printing at 150–300 W laser power, 500–1000 mm·s−1 laser scanning speed, and 100–134 J·mm−3 volumetric energy density. Microcomputed tomography scans indicated a negligible induced porosity throughout the specimens. The fully dense Mo(Si1-x,Alx)2-based composites, with hardness exceeding 545 HV1 and low roughness for both the top (horizontal) and side (vertical) surfaces, demonstrated that laser-based additive manufacturing can be exploited to create unique structures containing hexagonal Mo(Si0.67Al0.33)2.

scholarly journals The Effect of Laser Scanning Speed on Microstructure and Performance of Cr3C2-NiCr Cermet Fabricated by in-situ Laser Cladding

2021 ◽  
pp. X
Author(s):  
Deyuan LOU ◽  
Shaokun YANG ◽  
Sheng MEI ◽  
Qing LIU ◽  
Jian CHENG ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Powder Mixtures ◽  
Laser Scanning Speed ◽  
Nickel Based Alloy ◽  
And Performance ◽  
Microstructure And Performance ◽  
Carbide Content

To explore the effect of laser scanning speed on the microstructure and performance of Cr3C2-NiCr cermet layers fabricated by in-situ laser cladding, Cr3C2-NiCr cermet layers were laser cladded from Ni/Cr/Graphite (25:65:10 wt.%) elemental powder mixtures. The microstructures of the laser cladded cermet layers and the formation mechanism were investigated. In addition, the effect of laser scanning speed on the microstructure, friction and corrosion performance of the Cr3C2-NiCr cermet layers was studied. The results indicated that the in-situ laser cladded Cr3C2-NiCr cermet layers were composed of NiCr binder and Cr3C2. The laser scanning speed had a significant influence on the carbide content, composition and size. Furthermore, it affected the in-situ laser cladded cermet layer’s hardness and wear resistance. The corrosion resistance of the in-situ laser cladded cermet layer was superior to that of laser cladded nickel-based alloy and was improved with decreasing laser scanning speed.

Effects of Laser Parameters on the Formation of Al2O3-TiC Coating by Laser-Assisted Combustion

2014 ◽  
Vol 597 ◽  
pp. 175-183
Author(s):  
Cai Xuan Lu ◽  
He Ping Li ◽  
Peng Chen ◽  
Li Hong Xue ◽  
You Wei Yan
Keyword(s):  
Laser Processing ◽  
Laser Power ◽  
Laser Scanning ◽  
Nuclear Reactor ◽  
Composite Ceramic ◽  
Scanning Speed ◽  
Combustion Method ◽  
Processing Parameters ◽  
Ceramic Coatings ◽  
Laser Scanning Speed

Nowadays, Al2O3-based ceramic coatings have attracted considerable attention for their potential applications as tritium permeation barrier (TPB) in the nuclear reactor. Herein, dense composite ceramic coatings (Al2O3-TiC) have been successfully fabricated by a facile laser-assisted combustion method. The precursor Al-TiO2-C powder mixture underwent combustion synthesis at high temperatures generated by an incident laser, and Al2O3-TiC coatings were thus obtained. Their crystal structures and morphologies were monitored by x-ray diffraction and field emission scanning electron microscopy. The laser processing parameters, including laser power and laser scanning speed, have been found to play an important role in the microstructure of the products. The optimal laser processing parameters for obtaining Al2O3-TiC coating were 4kW in laser power and 6mm/s in laser scanning speed. The results in this paper may be beneficial to the future study of other coatings fabricated by laser-assisted combustion.

Microstructure and Wear Behaviour of Laser Induced In-Situ Formation of TiBx and TiC Titanium Composite Coatings

2010 ◽  
Vol 654-656 ◽  
pp. 1868-1871
Author(s):  
Jing Liang ◽  
Cui Xia Ren ◽  
Chang Sheng Liu ◽  
Sui Yuan Chen
Keyword(s):  
Composite Coatings ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Laser Line ◽  
Spherical Particles ◽  
Wear Behaviour ◽  
Micro Hardness ◽  
Line Energy ◽  
Single Path

Two kinds of mixed powders:Ti-6Al-4V/B/C and Ti-6Al-4V/B4C which are pre-pasted on Ti-6Al-4V substrates separately were scanned by a 500W pulsed YAG laser to induce in situ formation of titanium composite coatings contained TiBx and 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. Microstructure, phase components and micro-hardness of the coating were analyzed by OM, SEM, TEM, XRD and micro-hardness tester respectively. The optimized processing parameters of a single path laser scanned specimen in this case are as follows: PF: 15Hz, PW: 3ms, for the Ti-6Al-4V/B4C specimens the laser line energy ~12.5J/mm, for the Ti-6Al-4V/B/C specimens the laser line energy ~11J/mm. TiB and TiC ceramic were formed evenly reinforced in the matrix of Ti-6Al-4V with the morphology of needle, tiny dendrites and disperse spherical particles. The maximum micro-hardness of single-path layers is up to 750 Hv, which is over twice of that of the substrate (367Hv).The wear weight loss decreased nearly 3 times that of the substrate.

Microstructure and Wear Property of TiC Particle Reinforced Composite Coatings on H13 Steel Surface by Laser in-situ Synthesis

2014 ◽  
Vol 41 (10) ◽  
pp. 1003004
Author(s):  
姚爽 Yao Shuang ◽  
刘洪喜 Liu Hongxi ◽  
张晓伟 Zhang Xiaowei ◽  
李琦 Li Qi ◽  
张旭 Zhang Xu
Keyword(s):  
Steel Surface ◽  
Composite Coatings ◽  
In Situ Synthesis ◽  
Wear Property ◽  
H13 Steel ◽  
Reinforced Composite ◽  
Tic Particle ◽  
Particle Reinforced Composite

SYNTHESIS AND CHARACTERIZATION OF Zr-BASED AMORPHOUS AND CRYSTALLINE COMPOSITE COATING ON Ti SUBSTRATE BY LASER CLADDING

2014 ◽  
Vol 21 (01) ◽  
pp. 1450007 ◽  
Author(s):  
D. M. TANG ◽  
D. C. ZHANG ◽  
W. PENG ◽  
Z. C. LUO ◽  
X. Q. WU ◽  
...  
Keyword(s):  
Composite Coating ◽  
Amorphous Phase ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Composite Coatings ◽  
Scanning Speed ◽  
Raw Material ◽  
Thin Strip ◽  
Beam Diameter ◽  
Laser Scanning Speed

A thin strip of a Zr -based alloy with a composition of Zr 60 Cu 25 Fe 5 Al 10 (in atom percent) was used as a raw material, and the composite coatings containing Zr -based amorphous phase and crystallites on Ti substrate were fabricated by a one-step laser cladding method without protection. The microstructure, phase constitution, microhardness and wear properties of the coatings were investigated. The results indicate that the microstructure of the coatings is strongly dependent on the laser scanning speed under the conditions of the laser power of 1300 W and laser beam diameter of 6 mm, and the composite coating mainly containing amorphous phase with a small amount of the crystallites can be obtained at the laser scanning speed of 10 mm/s. The composite coating exhibits much higher microhardness than the pure Ti substrate, and thus it behaves superior wear resistance in comparison with the substrate.

Dissolution Behavior of Cast WC Particles in NiCrBSi-WC Coatings by Laser Induction Hybrid Cladding

2013 ◽  
Vol 668 ◽  
pp. 283-287
Author(s):  
Sheng Feng Zhou ◽  
Xiao Qin Dai
Keyword(s):  
High Speed ◽  
Laser Scanning ◽  
Metallic Matrix ◽  
High Hardness ◽  
Scanning Speed ◽  
Eutectic Structure ◽  
Dissolution Behavior ◽  
Positive Role ◽  
Laser Scanning Speed ◽  
Laser Induction

In order to characterize the dissolution of cast WC particles in Ni-based WC coatings by laser induction hybrid rapid cladding, NiCrBSi+50 wt.% WC coatings are produced on A3 steel by low and high speed laser induction hybrid cladding (LIHC). When laser scanning speed is only 600 mm/min, the crack-free coating has pores and its dilution is as high as 45%. At the bottom of coating, the cast WC particles are dissolved completely and the herringbone M6C eutectics are precipitated. In the center of coating, the cast WC particles are also dissolved completely and the acicular, blocky and dendritic carbides with relatively low hardness are precipitated. At two sides of coating, some cast WC particles are dissolved partially and interact with Ni-based alloy to form an alloyed reaction layer, while others preserve the primary eutectic structure and high hardness. When laser scanning speed and powder feeding rate are increased to 1500 mm/min and 85.6 g/min, the coating has cracks but no pores. Its dilution can be markedly decreased to 7.8%. Moreover, a majority of WC particles are still composed of primary eutectic structure and keep their high hardness, which can play a positive role in strengthening Ni-based metallic matrix.

Sign in / Sign up

Export Citation Format

Share Document