Numerical Simulation of Temperature Field and Stress Field to Multiple Laser Cladding Co Coatings

2013 ◽  
Vol 456 ◽  
pp. 382-387 ◽  
Author(s):  
Lin Ding ◽  
Ming Xi Li ◽  
Dao Ye Huang ◽  
Hong Yun Jang
Keyword(s):  
Temperature Field ◽  
Stress Field ◽  
Laser Cladding ◽  
Steel Substrate ◽  
Low Carbon Steel ◽  
Work Piece ◽  
Low Carbon ◽  
Scanning Velocity ◽  
Maximum Deformation ◽  
Laser Cladding Process

In order to analyze temperature field and stress field of Co-based alloys laser cladding, the model of Co-based alloys laser cladding with preset-powder method has been made on low carbon steel substrate. The temperature field and stress field of laser cladding process was analyzed by SYSWELD software, and Experimental verification is done. The results showed that temperature field is appear to a trailing tail of comet, favorable metallurgy bonding with 12.3% dilution was obtained by scanning velocity was 4 mm/s. and instantaneous cooling rate of molten pool with 4 mm/s and 5 mm/s are increased to 1.47 times and 2.02 times of 3 mm/s. The transverse residual stress different nodes on the surface of coatings are always tensile stress, and it is almost steady, the maximum deformation is 0.34 mm at the edge of work-piece, these are consistent with experimental results. These results provide reference and guide to obtain high quality coatings.

Numerical Analysis of Temperature Field of Co-Based Alloy Coatings by Laser Cladding on the Mild Steel

2013 ◽  
Vol 364 ◽  
pp. 603-608
Author(s):  
Lin Ding ◽  
Ming Xi Li ◽  
Xiu Chuan Zhu ◽  
Hong Yun Jiang
Keyword(s):  
Temperature Field ◽  
Steady State ◽  
Laser Cladding ◽  
Solidification Rate ◽  
Bonding Interface ◽  
Scanning Velocity ◽  
Laser Cladding Process ◽  
Key Words Laser ◽  
Optimization And Control ◽  
And Control

In order to analyze temperature field of Co-based alloys laser cladding, the model of Co-based alloys laser cladding with preset-powder method has been made by finite element method. The temperature field of coatings was analyzed by SYSWELD software, and Experimental verification is done. The results showed that temperature field changed from non-steady-state to steady-state in the laser cladding process. Favorable metallurgy bonding with 8.26% dilution was obtained by scanning velocity was 5 mm/s, the temperature gradient of surface coatings is obviously decreased to 1/20 of bonding interface, the solidification rate of surface is nearly 70 times of bonding interface. Right power with 1.6 kW and 1.87 kW was found when scanning velocity was 3 mm/s and 4 mm/s by SYSWELD software. Based on solidification theory, shape factor of crystallization are analyzed, these are consistent with experimental results. These results provide reference and guide for parametric optimization and control dilution rate of laser cladding. Key words: Laser cladding, Co-based alloy, SYSWELD, Simulation

Effect of Mo Content on the Corrosion Resistance of Fe-Based Amorphous Composite Coating

2016 ◽  
Vol 849 ◽  
pp. 636-641
Author(s):  
Run Sen Jiang ◽  
Yong Tian Wang ◽  
Lin Hu ◽  
Gang Xu ◽  
Zong De Liu
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Low Carbon Steel ◽  
Corrosion Current ◽  
Nominal Composition ◽  
Low Carbon ◽  
Laser Cladding Process ◽  
Superior Effect ◽  
Mo Content

A Fe-based amorphous composite coating doped by molybdenum was fabricated by the pulse laser cladding technology. The substrate was a low carbon steel plate. The nominal composition of the powder in the range from 100 to 200 meshes was (wt.%) Cr:14.95, Mo:25.7, B:1.24, C:3.45, Y:3.40, Fe:51.29, which was selected for the laser cladding process. The microstructure, phase composition, hardness and corrosion resistance of the coatings were characterized by means of SEM, EDS, XRD , DSC and potentiodynamic polarization test. The results show that the coating which was composed of amorphous and nanocrystal phases had the dense structure and metallurgical bonding with the substrate, meanwhile with low porosity and cracks. The addition of molybdenum played an important role in improving the corrosion resistance of the coatings. With the increasing content of molybdenum, the hardness had no significant change, while the corrosion resistance of the coatings significantly increased. From the results of polarization curves, the corrosion current density of the coating added 0 wt.% Mo is higher than that of the coatings added 2 wt.% Mo and 10 wt.% Mo. The molybdenum has a superior effect on the corrosion resistance in Fe-based amorphous composite coating.

scholarly journals Influence of the Laser Cladding Parameters on the Morphology, Wear and Corrosion Resistance of WC-Co/NiCrBSi Composite Coatings

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5583
Author(s):  
Iosif Hulka ◽  
Ion D. Uțu ◽  
Diana Avram ◽  
Mircea L. Dan ◽  
Alexandru Pascu ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Laser Cladding ◽  
Sliding Wear ◽  
Protective Coatings ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Low Carbon Steel ◽  
Thermal Spraying ◽  
Low Carbon ◽  
Wear And Corrosion

To enhance the sliding wear and corrosion behavior of steels with low carbon content, cermet composite coatings are usually deposited on their surface by various deposition processes. Laser cladding, compared to other deposition techniques such as electroplating, arc welding, and thermal spraying, has numerous advantages to produce such protective coatings. The paper presents the optimization of laser cladding deposition speed versus energy density in order to obtain WC-Co/NiCrBSi coatings with Ni-Al addition free of defects and reduced porosity deposited on low carbon steel substrate. The microstructure and chemical composition were investigated by SEM combined with EDX analysis while XRD was performed in order to examinate the phases within the coatings. In order to investigate the cladding speed influence on the coatings, hardness measurements, POD (pin on disk) wear tests and corrosion tests in 3.5% NaCl solution were carried out. The results showed that an optimal cladding speed has a crucial impact on the microstructure, composition, and hardness. It was found out that optimizing the cladding deposition speed proved to be effective in enhancing the sliding wear resistance and corrosion behavior by controlling the iron content within the coatings.

Fabrication of SiC Particulates Reinforced MoSi2 Composite Coating by Laser Cladding

2008 ◽  
Vol 373-374 ◽  
pp. 304-307
Author(s):  
Sen Yang ◽  
Ming Run Wang ◽  
Tao Gong ◽  
Wen Jin Liu
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Continuous Wave ◽  
Steel Substrate ◽  
Laser Output Power ◽  
Scanning Velocity ◽  
Sic Particulates ◽  
Metallurgical Bond ◽  
Improve Wear Resistance

In order to improve wear resistance of carbon steel, laser cladding experiments were carried out using a 3kW continuous wave CO2 laser. The diameter of the laser beam was 3-5mm, the scanning velocity was 3-10mm/s, and the laser output power was 1.0-1.3kW. The experimental results showed that MoSi2/SiCP composites coating could be in-situ synthesized from mixture powders of molybdenum, silicon and SiC by laser cladding. A good metallurgical bond between the coating and the substrate could be achieved. The microstructures of the coating were mainly composed of MoSi2, SiC and FeSiMo phases. The average microhardness of the coating was about HV0.21300, about 6.0 times larger than that of steel substrate.

Effects of Dipping Pretreatment on the Flame Deposition of Carbon Nanostructure on the Low Carbon Steel Substrate

2013 ◽  
Vol 734-737 ◽  
pp. 2269-2272
Author(s):  
Hong Mei Zhu ◽  
Shu Mei Lei ◽  
Tong Chun Kuang
Keyword(s):  
Nitric Acid ◽  
Carbon Steel ◽  
Acid Solution ◽  
Carbon Nanofibers ◽  
Carbon Nanoparticles ◽  
Steel Substrate ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Carbon Nanostructure ◽  
Flame Method

In this paper, a low carbon steel was used as the substrate to prepare the carbon nanostructural materials by the oxygen-acetylene flame method. The experimental results show that the composite products including nodular carbon nanoparticles and amorphous carbon were obtained on the substrate after a mechanical polishing pretreatment. Comparatively, the short tubular carbon nanofibers with the diameter of around 100 nm were deposited on the substrate pretreated by dipping in the concentrated nitric acid solution. The possible mechanism for the growth of such carbon nanofibers was discussed.

Morphology and Mechanical Properties of a Composite Coating by Electrostatic Dry Spray Method

2021 ◽  
Vol 886 ◽  
pp. 168-174
Author(s):  
Mohanad N. Al-Shroofy ◽  
Hanna A. Al-Kaisy ◽  
Rabab Chalaby
Keyword(s):  
Composite Coating ◽  
Steel Substrate ◽  
Low Carbon Steel ◽  
Spray Coating ◽  
Manufacturing Cost ◽  
Low Carbon ◽  
Spray Method ◽  
Coating Layers ◽  
Al Powder ◽  
Electrostatic Spray

Powder spray coating was used for many applications such as paint decoration and protection against corrosive environments. The electrostatic spray method is used to lower the manufacturing cost and the environmental effect during the production process. It is done by electrostatic device and spray gun to create a layer on the substrate to play a protective role. Different dry powders were mixed to form a composite mixture consisted of Al2O3 and SiC or ZrSiO4 with Al powder as a binder. The powders mixture was deposited by electrostatic spray technique with a high voltage of 15 kV on a low carbon steel substrate of (40 x 10 x 4) mm in dimensions. Two groups of mixtures were used to form the coating layers. Powders of Al2O3 with (20 and 40) weight percent (wt%) of SiC as the first group and (20 and 40) wt% of ZrSiO4 as the second group were used. 5 wt% of Al powder was added as a binder, and the samples were heat treated at 900 C° for 2 hours. A detailed characterization of the composite coating layers was performed using XRD, SEM, and EDX, as well as, micro-hardness measurements. The obtained surface composite layers were smooth and having good particle distribution which leads to enhance roughness values (Ra). Furthermore, the hardness increased with increasing the amount of carbide and zirconia, and the obtained layers show no presence of defects or cracks.

Hadfield steel coatings on low carbon steel by laser cladding

1995 ◽  
Vol 202 (1-2) ◽  
pp. 142-147 ◽  
Author(s):  
J.M. Pelletier ◽  
F. Oucherif ◽  
P. Sallamand ◽  
A.B. Vannes
Keyword(s):  
Carbon Steel ◽  
Laser Cladding ◽  
Low Carbon Steel ◽  
Hadfield Steel ◽  
Low Carbon
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