Research of Composite Coating Composed of Mo Wire and High-Cr Cast Iron Made by Laser Cladding Technology

2013 ◽  
Vol 395-396 ◽  
pp. 1073-1076
Author(s):  
Wei Zhang
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
H13 Steel ◽  
Cladding Layer ◽  
Binding Force ◽  
Average Hardness ◽  
Metallurgical Bonding ◽  
Gas Cavity ◽  
Cast Iron Powder ◽  
Cladding Material

The experiments of laser cladding on the surface of H13 steel were made. Molybdenum (Mo) wire and high-chromium (Cr) cast iron powder were used as cladding material. The microstructure and hardness of laser cladding layer were studied. The experiments showed that Mo wire and 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. There was a slight melting on the surface of Mo wire which would greatly increase the binding force between Mo wire and high-Cr cast iron. Mo wire could make grain refine and limit the growing of carbide. The average hardness of junction zone of Mo wire and high-Cr cast iron was 750HV0.2 which was higher than that of cladding zone composed of high-Cr cast iron (650HV0.2).

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.

Research of Microstructure and Hardness of Co55 and W Coating Made by Laser Cladding

2015 ◽  
Vol 1120-1121 ◽  
pp. 694-697
Author(s):  
Wei Zhang
Keyword(s):  
Laser Cladding ◽  
Alloy Powder ◽  
Tungsten Powder ◽  
Weight Percent ◽  
Secondary Carbide ◽  
Mixed Powder ◽  
Dendritic Crystal ◽  
Cladding Layer ◽  
Average Hardness ◽  
Cladding Material

The experiment of laser cladding on the surface of 20 steel was made. The mixed powder of cobalt-based alloy powder (Co55) and tungsten powder was used as cladding material. There were three kinds of weight percent of tungsten powder, 5%, 10% and 15%. The microstructure and hardness of three kinds of laser cladding layer were studied. The microstructure of cladding zone was greatly refined after adding tungsten powder to Co55 powder. When the proportion of tungsten powder was 5%, the cladding zone was made up of dendritic crystal. The average hardness of cladding zone was 590 HV0.2. When the proportion of tungsten powder rose to 10%, there was reticular secondary carbide precipitating along the grain boundary. The average hardness of cladding zone was 648 HV0.2. When the proportion of tungsten powder rose to 15%, much granular carbide would diffusely distribute in Ni-based solid solution. The average hardness of cladding zone was 831 HV0.2.

Experimental Study of Nano-Al2O3 Particles Reinforced Fe-Based Composite Coating Made by Laser Cladding

2015 ◽  
Vol 1120-1121 ◽  
pp. 698-701
Author(s):  
Wei Zhang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Experimental Study ◽  
Composite Coating ◽  
Laser Cladding ◽  
Cladding Layer ◽  
Average Hardness ◽  
Crystal Grains ◽  
Cladding Material ◽  
Three Phases

The experiment of laser cladding on the surface of Cr12 mold steel was made. Ni-coated nano-Al2O3 particles powder was used as cladding material. The microstructure and hardness of laser cladding layer were tested. The research showed that the compact cladding layer without crack, gas hole and other defects could be made by laser cladding. The cladding layer was made up of three phases, Fe-Ni solid solution, Fe-Cr solid solution and nano-Al2O3 particle. nano-Al2O3 particles enhanced the inhomogeneous nucleation of Fe-based alloy, refined the crystal grains and strengthened the mechanical properties of cladding layer. The average hardness of cladding zone was 900 HV0.2 which was 2.2 times higher than that of substrate.

scholarly journals Research on Laser Cladding Co-Based Alloy on the Surface of Vermicular Graphite Cast Iron

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1241
Author(s):  
Fuzhen Sun ◽  
Keqian Cai ◽  
Xiaoxu Li ◽  
Ming Pang
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Structural Parameters ◽  
Corrosion Current ◽  
The Self ◽  
Molten Layer ◽  
Cladding Layer ◽  
Average Hardness ◽  
Graphite Cast Iron ◽  
Clad Layer

To further improve the hardness of the laser cladding layer on the surface of the vermicular graphite cast iron, the structural parameters of the laser cladding Co-base were designed and optimized, and the properties of the clad layer were evaluated using optical microscopy (OM), scanning electron microscopy (SEM), energy spectroscopy (EDS), X-ray diffractometer (XRD), electrochemical workstation, and friction wear equipment. The results show that the average hardness of the molten layer of Ni and Co-based composite cladding layer is 504 HV0.5, which is 0.64 times that of the Co-based cladding layer due to the combined factors of Ni-Cr-Fe equivalent to the dilution of the Ni-based cladding layer to the Co-based cladding layer. Due to the potential difference of the Ni, Cr, and Co elements on the surface of the cladding layer, the self-corrosion potential of the Ni and Co-based composite cladding layer is 1.08 times that of the Co-based cladding layer, and the self-corrosion current density is 0.51 times. Laser cladding Co-based cladding layer has high corrosion resistance. Under the influence of plastic deformation and oxidative wear of the cladding layer of the Ni and Co-based composite cladding layer, the wear amount of the cladding layer of the Ni and Co-based composite cladding layer is less.

Microstructures and Performance of Laser Cladding and Quenching Remanufactured Cladding Layer on QT700 Ductile Cast Iron Gear Surface

2021 ◽  
Vol 58 (5) ◽  
pp. 0514003-514003185
Author(s):  
陈世鑫 Chen Shixin ◽  
雷卫宁 Lei Weining ◽  
任维彬 Ren Weibin ◽  
薛冰 Xue Bing
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Ductile Cast Iron ◽  
Cladding Layer ◽  
And Performance

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.

Process Optimization and Properties of Laser Cladding High Vanadium High Speed Steel Coatings on Nodular Cast Iron

2013 ◽  
Vol 712-715 ◽  
pp. 611-614 ◽  
Author(s):  
Ni Jun Xu ◽  
Jian Bin Lv ◽  
Ting Sun ◽  
Chang Sheng Liu
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Laser Cladding ◽  
High Speed ◽  
High Speed Steel ◽  
Nodular Cast Iron ◽  
Vanadium Content ◽  
Treatment Technology ◽  
Metallurgical Bonding ◽  
Steel Rolls

As withstanding very high loads, thermal cycling leading to thermal fatigue, and severe environmental in the steel industry, rolls with long service life are specially required. High speed steel with high vanadium content is a newly-developed wear-resistance material that has been studied and used in some countries for making steel rolls. As a surface treatment technology, laser cladding can fabricate coating to improve the wear resistance of substrate. In this paper, the substrates for laser cladding were nodular cast iron rolls, Nd: YAG solid pulsed laser was used to explore the feasibility of preparation high vanadium high speed steel (HVHSS) coatings. The Nd: YAG laser cladding results that the coated layers combined metallurgically with the substrate with a lot of microcracks. The average microhardness up to 650 HV is more than 2 times as high as that of the substrate. After laser remelting, a fully dense and crack free HVHHS coating with an excellent metallurgical bonding was deposited. The presence of VC in the coating mainly improves the microhardness of coating up to about 650 HV.

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.

Microstructure and Properties of Laser Cladding Co-Based Alloy Coatings

2011 ◽  
Vol 295-297 ◽  
pp. 1665-1668 ◽  
Author(s):  
Hu Cheng ◽  
Zhi Gang Fang ◽  
Sheng Dai ◽  
Xian Rui Zhao ◽  
Jian Yi
Keyword(s):  
Laser Cladding ◽  
Nd:Yag Laser ◽  
Central Zone ◽  
Equiaxed Crystal ◽  
H13 Steel ◽  
Microstructure And Properties ◽  
Metallurgical Bonding ◽  
Bonding Zone ◽  
Microhardness Tester

The Co-based alloy coatings were successfully fabricated on H13 steel by Nd:YAG and CO2laser. The microstructure and properties of the laser cladded coatings were compared and analyzed by SEM, EDS, XRD and microhardness tester. The results show that the excellent metallurgical bonding has formed at the interface between substrate and laser cladded coatings. Cellular crystal at the bonding zone, cellular dendrite at the central zone and reticular equiaxed crystal near top surface were observed in Nd:YAG laser cladded coating, while the typically hypoeutectic character was found in CO2laser cladded coating. Phase constituents of both coatings are mainly composed of Cr23C6, Co3Mo2Si, MoC, FeCr and γ-Co. The microhardness of H13 steel is greatly improved by laser cladding, however the microhardness of the CO2laser cladded coating is even higher than the Nd:YAG laser cladded coating.

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