Preparation and Properties Study of Laser Cladding of Ni-Based Alloy on Copper

2010 ◽  
Vol 455 ◽  
pp. 216-219
Author(s):  
Y.S. Wang ◽  
F.D. Zhu ◽  
N.W. Liu
Keyword(s):  
Plasma Spraying ◽  
Laser Cladding ◽  
Alloy Coating ◽  
Alloy Layer ◽  
Laser Remelting ◽  
Yag Laser ◽  
Cladding Layer ◽  
Metallurgical Bonding ◽  
Organization Analysis ◽  
Surface Performance

In order to improve the surface Performance of thick copperplate, A Ni- Cr alloy coating metallurgically bonded onto thick copperplate is performed by YAG laser remelting plasma spraying coating process. In laser cladding processing, it is difficult to get good metallurgical bonding between the layer and copperplate. Plasma spraying technology is developed to get a alloy layer on the surface of thick copperplate, and then using YAG laser cladding method to make a coating. The results of Micro organization analysis indicate that the cladding layer and substrate form favorable metallurgical bonding, as a narrow metallurgical bonding zone, about 3m in thickness. The structure is more compact compared with witch of plasma spraying coating, and the crystal grains are refined grain.

Research on Laser-Hybrid Cladding of Ni-Cr Alloy on Copper

2017 ◽  
Vol 744 ◽  
pp. 270-274
Author(s):  
Fu Dong Zhu ◽  
Bi Yun Zhu
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Copper Substrate ◽  
Alloy Layer ◽  
Substrate Roughness ◽  
Metallurgical Bonding ◽  
Organization Analysis ◽  
Laser Hybrid ◽  
Arc Deposition ◽  
Deposition Technology

In order to improve the wear resistance of the surface of thick copperplate, A layer of Ni-Co-Cr alloy on thick copperplate surface is performed by laser –hybrid cladding process. In laser cladding processing, it is known that it is difficult to get good metallurgical bonding between the layer and copperplate. Micro-arc deposition technology is developed to get a thin alloy layer on the surface of thick copperplate, and then using laser cladding method to make thick coating. Micro organization analysis and wear resistance comparison experiments are taken to the specimen. From the microscopic structure analysis, it can be seen that the deposition and substrate form favorable metallurgy bonding, as a narrow metallurgical bonding zone, about 20μm in width. The micro- structure photos show that the coating is more compact, and crystal grains are refined grain composed of γ-Ni, Cr7C3 and CrB. The micro-hardness of the cladding zone is between 650HV~850HV, which is much higher than the copper substrate. Roughness measurement of the specimens shows that the cladding layer is smoother. The experiment’s result shows that laser-arc hybrid cladding can perform coating of Ni-Cr alloy, metallurgy bonding with the copperplate, on its surface.

Laser Cladding of Ni-Based Alloy on Mg Alloy with Brass Transition

2011 ◽  
Vol 686 ◽  
pp. 197-201
Author(s):  
Qing Kun He ◽  
Hong Zhi Cui ◽  
Shao Hua Huang ◽  
Jin Quan Sun ◽  
Hong Guang Yang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Transition Layer ◽  
Corrosion Potential ◽  
Alloy Layer ◽  
Mg Alloy ◽  
Transitional Layer ◽  
Cladding Layer ◽  
Cu And Zn

Laser cladding of Ni-based alloy on Mg-alloy was achieved by using brass as transition layer on substrate. The Ni-based alloy layer free of cracks and porosities was bonded metallurgically with the Mg substrate using brass as the transitional layer. The Ni-based cladding layer was mainly composed of Cr2Ni3, FeNi3, AlNi3 while the content of Mg, Al, Cu and Zn is very low in the cladding layer. Microhardness and the wear resistance of the sample were tested, whose results indicated that microhardness and wear resistance increased 12.8 times and 13.3 times, respectively compared with the substrate. In addition, the corrosion potential (Ecorr) of the sample was much higher than that of untreated materials.

Influence of Scanning Speed on Microstructure and Hardness during Laser Cladding High-Cr Cast Iron

2013 ◽  
Vol 395-396 ◽  
pp. 1127-1131 ◽  
Author(s):  
Wei Zhang
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Fish Bone ◽  
Cladding Layer ◽  
Metallurgical Bonding ◽  
Laser Scanning Speed ◽  
Gas Cavity ◽  
Cladding Layers

The experiments of laser cladding on the surface of 20 steel were made. High-chromium (Cr) cast iron powder was used as cladding material. The microstructure and hardness of laser cladding layers under different scanning speed were studied. The experiments showed that high-Cr cast iron cladding layer had better properties such as minute crystals, high density, no crack, no gas cavity and good metallurgical bonding with base metal. When the scanning speed was low, such as 10mm/min, the microstructure of cladding layer was cellular dendrite. There were much carbide with the shape of fish-bone distributing among cellular grains. Under higher scanning speed (from 100mm/min to 300mm/min), needle-shaped primary cementite would come into being. When laser scanning speed was 500mm/min, the carbide of cladding zone was very thin. With the increasing of laser scanning speed, the average hardness of cladding zone increased from 388HV0.2 to 580 HV0.2.

Microstructure and Properties of Laser Cladding Cu-TiB2 Composite Coating on Copper

2012 ◽  
Vol 512-515 ◽  
pp. 639-642 ◽  
Author(s):  
Xiao Qin Guo ◽  
Jing Bo Chen ◽  
Xin Fang Zhang ◽  
Yong Kai Wang ◽  
Rui Zhang
Keyword(s):  
Laser Cladding ◽  
Coating Layer ◽  
Composite Coatings ◽  
Copper Substrate ◽  
Bonding Interface ◽  
X Ray ◽  
Cladding Layer ◽  
Metallurgical Bonding ◽  
Tib2 Particles

Cu-TiB2 composite coatings were in-situ synthesized on the copper substrate by using a Nd: YAG laser. The microstructure of the coating and the bonding interface between the laser cladding layer and the substrate were studied by X-ray and SEM. The microhardness and the wear resisting property were tested. The results show that the TiB2 particles were well-proportioned and spherical existing in the coating layer, the bonding interface between the layer and substrate was metallurgical bonding. The microhardness reaches HV450 and the wear resistance is about 10 times as much as that of Cu substate.

Microstructure and Properties of Laser Cladding Co-Based Alloy Layer

2013 ◽  
Vol 764 ◽  
pp. 47-53 ◽  
Author(s):  
X.R. Zhao ◽  
Dun Wen Zuo ◽  
H. Cheng ◽  
Q.T. Li ◽  
S. Dai ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Base Alloy ◽  
Steel Substrate ◽  
Alloy Layer ◽  
Crystal Layer ◽  
X Ray Diffraction ◽  
Continuous Laser ◽  
Columnar Crystal ◽  
Cladding Layer ◽  
Cladding Layers

The Co-base alloy laser cladding layer was coated on the 2738 mold steel surface by using the TJ-HL-5000 transverse-flow CO2 continuous laser. The morphology and hardness were investigated by metallography microscope, scanning electron microscopy (SEM), X-ray diffraction (XRD) and microhardness tester. The metallography microscope and SEM investigations show that from interface to surface along the cross section direction, the cladding layers consist of plane crystal layer, columnar crystal layer, dendrites layer and surface cellular crystal layer, respectively. XRD results indicate that the cladding layer is made of γ-Co, Cr23C6, MoC, FeCr and Co3Mo2Si phases. The micro-hardness of the laser cladding coating was about 900-1100HV1, 3 times or more of the steel substrate. And the mechanisms of microstructure formation and strengthening are investigated.

Technological Research on Preparing the Ni—Cr Cladding Layer on the Surface of Copper

2010 ◽  
Vol 37-38 ◽  
pp. 1384-1387
Author(s):  
Neng Wen Liu ◽  
Yun Shan Wang
Keyword(s):  
Thermal Conductivity ◽  
Optical Microscopy ◽  
Pulse Laser ◽  
Laser Cladding ◽  
Copper Substrate ◽  
Alloy Layer ◽  
High Thermal Conductivity ◽  
Technological Research ◽  
Cladding Layer ◽  
Cladding Layers

Copper has some excellent performances in anti-erosion and high thermal conductivity. It is applicable in many important fields. In the paper, two methods of preparing Ni-Cr alloy cladding layer on the surface of copper are proposed, including the spray welding and YAG pulse laser cladding .Then the Ni-Cr alloy layer prepared on the copper is investigated by optical microscopy, there is no hole and crack in the cladding layer. The experimental results show the coating is metallurgically bonded with the substrate. In comparison to the prepared cladding layers, the Ni-Cr cladding layer prepared by YAG pulse laser is the better, the size of copper is not restricted, and the copper substrate isn’t preheated.

Research on the Fabrication of Bioceramic Composite Coatings Fabricated by Nd-YAG Laser Cladding

2015 ◽  
Vol 723 ◽  
pp. 852-855
Author(s):  
Ying Chun Wang ◽  
Xiang Fei Lv ◽  
Deng Jie Zhu ◽  
Shao Min Qu
Keyword(s):  
Composite Coating ◽  
Laser Cladding ◽  
Composite Coatings ◽  
New Technology ◽  
Scanning Speed ◽  
Processing Technique ◽  
Yag Laser ◽  
Cladding Layer ◽  
Ti6al4v Substrate ◽  
Average Grain Size

Laser surface cladding is a material processing technique to overlay the precursor material with the substrate to form a sound chemical and metallurgical bonding. Recently, laser cladding technique has been introduced in the bioceramic coating field. This paper presents a new technology to obtain bioceramic composite coating on Ti6Al4V substrate by Nd-YAG laser cladding. The microstructures of the mixed powders and cladding layer were investigated by scanning electron microscopy, and the compositions were analyzed by electron diffraction spectroscopy. The phases of the mixed powders and cladding layer were clarified by X-ray diffraction technology. Composite coating including HAP,Ca2P2O7,Ca3(PO4)2 and calcium titanates was successfully obtained by Nd-YAG laser cladding with pre-depositing mixed powders of CaHPO4·2H2O and CaCO3 directly on Ti6Al4V substrate. The average grain size of the mixed powders is 3μm from the image analyse software. The most important parameter that affected the completion of laser cladding was the scanning speed.

scholarly journals Effects of Process Parameters on Geometrical Characteristics and Microstructure of TiC Particle-Reinforced Co50 Alloy by Laser Cladding

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Nga Pham Thi-Hong
Keyword(s):  
Laser Cladding ◽  
Steel Surface ◽  
Composite Coatings ◽  
Alloy Coating ◽  
H13 Steel ◽  
Bright Band ◽  
Metallurgical Bonding ◽  
Tic Particle ◽  
Spherical Structures

Laser cladding of Co50 alloy coating and Co50 composite coatings doped with 10, 20, and 30 wt.% TiC particles was performed on the H13 steel surface. The effects of TiC concentration on the phase composition, microstructure, and microhardness of the coatings were studied. The results indicated that, in 10% TiC coating, the “bright band” is a quite flat-growth tissue, while with 20% TiC, the “white bright band” contains a large amount of black TiC particles. The composite coating Co50, 10% TiC, and 20% TiC samples can clearly distinguish the cladding zone, bonding zone, and heat-affected zone, and a good metallurgical bond is formed between the coating and the substrate. The 30% TiC coating and the substrate are not well bonded, which is attributed to the high TiC content in the coating; however, it has the best surface morphology, and there is no porosity on the surface. 10% TiC coatings have poor surface quality, show a spraying material phenomenon on two side edges which is quite serious, and a lot of porosity on the surface of the coating. In addition, 10% TiC coating includes the original TiC particles and primary TiC particles that are precipitated in situ from the liquid phase during solidification; 20% TiC coating indicates a large amount of TiC in the form of cross petals and twigs, and the figure points out that TiC exists like a large number of diffusely distributed spherical structures in the 30% TiC coating. The coatings of TiC/Co composite with less than 20% TiC showed good metallurgical bonding characteristics with the H13 steel surface.

Processing parameter, microstructure and hardness of Ni base intermetallic alloy coating fabricated by laser cladding

MRS Advances ◽  
2017 ◽  
Vol 2 (26) ◽  
pp. 1381-1386 ◽  
Author(s):  
Takeshi Okuno ◽  
Yasuyuki Kaneno ◽  
Takuto Yamaguchi ◽  
Takayuki Takasugi ◽  
Satoshi Semboshi ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Feed Rate ◽  
Laser Power ◽  
Alloy Coating ◽  
Intermetallic Alloy ◽  
Ingot Metallurgy ◽  
Processing Parameter ◽  
Powder Feed Rate ◽  
Cladding Layer ◽  
Powder Feed

ABSTRACTNi base intermetallic alloy coating was fabricated by laser cladding, controlling the laser power and powder feed rate. Atomized powder of the Ni base intermetallic alloy was laser-cladded on the substrate of stainless steel 304. The hardness and microstructure of the clad layers were investigated by Vickers hardness test, SEM, XRD and TEM observations. The hardness of the cladding layer was affected by the dilution with the substrate; it increased with decreasing laser power and increasing powder feed rate. By optimizing the dilution with the substrate, the cladding layer with an almost identical hardness level to that of the Ni base intermetallic alloy fabricated by ingot metallurgy was obtained. The TEM observations revealed that a very fine-sized microstructure composed of Ni3Al and Ni3V was partially formed even in the as-cladded state. After annealing, the two-phase microstructure composed of Ni3Al and Ni3V was developed in the cladding layer, resulting in enhanced hardness in the cladding layers fabricated in the majority of cladding conditions.

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