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.

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).

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

Experimental Study on Laser Cladding of Ni-Based Alloys on Spheroidal Graphite Cast Iron Surface

2017 ◽  
Vol 54 (10) ◽  
pp. 101412
Author(s):  
翟建华 Zhai Jianhua ◽  
许慧印 Xu Huiyin ◽  
刘志杰 Liu Zhijie ◽  
沈 成 Shen Cheng ◽  
王乾宝 Wang Qianbao
Keyword(s):  
Experimental Study ◽  
Cast Iron ◽  
Laser Cladding ◽  
Iron Surface ◽  
Spheroidal Graphite ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron

Study on optimization of laser cladding using Stellite 6 powder for exhaust valve face of marine engine

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940037 ◽  
Author(s):  
Moo-Keun Song ◽  
Su-Han Park ◽  
Su-Jin Lee ◽  
Jong-Do Kim
Keyword(s):  
Heat Source ◽  
Laser Cladding ◽  
Exhaust Valve ◽  
Optimum Conditions ◽  
Marine Engine ◽  
Stellite 6 ◽  
Average Hardness ◽  
Clad Layer ◽  
Power Diode ◽  
High Power Diode Laser

In this study, experiments with various parameters were performed to apply laser cladding to the exhaust valve face of a marine engine and optimum conditions were derived. The used specimen was an actual exhaust valve, and the heat source was a high-power diode laser. Cladding was applied to the exhaust valve face using the optimum conditions, and a sound clad layer without internal defects, such as pores and cracks, was formed. The average hardness of the clad layer formed under the optimum conditions was higher than 529 Hv. Component analysis showed a very low dilution rate inside the clad layer.

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.

Effects of Heat Treatment and Alloying of Spheroidal Graphite Cast Iron on Corrosion Resistance in Aqueous Environment

2004 ◽  
Vol 449-452 ◽  
pp. 533-536
Author(s):  
M. Aoyama ◽  
K. Tahashi ◽  
K. Matsuno
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Cast Iron ◽  
Current Density ◽  
Electrode Potential ◽  
Corrosion Current ◽  
Spheroidal Graphite ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron ◽  
The Matrix

The present study examined the effects of heat treatment and the addition of Cu-Ni alloy on the corrosion resistance of the matrix of spheroidal graphite cast iron in aqueous environments. Test materials of white cast iron and carbon steel were used for comparison with spheroidal graphite cast iron. The alloy spheroidal graphite cast iron that added Cu and Ni was prepared. The spheroidal graphite cast iron was subjected to three kinds of heat treatment to adjust the matrix: annealing, oil quenching, and austemper heat treatment. In electrochemical tests, measurements of corrosion electrode potential and cathode and anode polarization were used. The following was clarified from the relationship between the electrode potential and current density of each of the materials in each of the solution. The alloy spheroidal graphite cast iron had a high corrosion electrode potential owing to the addition of Cu-Ni, and tended to have a low corrosion current density. This demonstrates that in any of the materials having a matrix adjusted by heat treatment, the addition of Cu-Ni increased the corrosion resistance. The corrosion current density was highest in a sulfuric acid environment.

scholarly journals Optimization of Microstructural Evolution during Laser Cladding of Ni Based Powder on GCI Glass Molds

2019 ◽  
Vol 813 ◽  
pp. 185-190 ◽  
Author(s):  
Fazati Bourahima ◽  
Anne Laure Helbert ◽  
Vincent Ji ◽  
Michel Rege ◽  
Arnaud Courteaux ◽  
...  
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Glass Industry ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Process Conditions ◽  
Graphite Cast Iron ◽  
Flake Graphite Cast Iron ◽  
Powder Fusion ◽  
The Impact

In glass industry, laser cladding is an innovative surfacing technique allowing to deposit a layer of nickel to protect glass mold against corrosion, abrasion and thermal fatigue. This method (powder fusion by projection), well known in additive manufacturing represents a real technological leap for the glass industry. But during laser cladding of Ni-based powder on gray cast iron, cracks can be observed for some process conditions. These cracks are often due to the Heat Affected Zone that creates structural stresses linked to the development of a martensitic structure in the ferritic matrix of the lamellar graphite cast iron. The aim of this work is to observe the impact of laser cladding (without substrate pre-heating usually employed to limit cracking) on the coating behavior but also on the flake-graphite cast iron substrates. The microstructure and the mechanical properties were studied (SEM and microanalysis, microhardness) around the interface cladding/substrate. Also, the impact of the processing parameters (power P (1500-2300 W), scanning speed v (2.5-10 mm/s) and powder feeding rate PFR (24.5-32.5 g/min) was studied by using the ANOVA (ANalysis Of VAriance) technique. It has been observed that laser cladding on graphite cast iron is possible without cracks by limiting the linear energy induced by the process. Also, an optimization of the processing parameters (P, v, PFR) in order to obtain the industrial expected geometry of the coating has been proposed.

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.

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