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.

scholarly journals The Effects of Laser Remelting on the Microstructure and Performance of Bainitic Steel

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 912 ◽  
Author(s):  
Yuelong Yu ◽  
Min Zhang ◽  
Yingchun Guan ◽  
Peng Wu ◽  
Xiaoyu Chong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Laser Scanning ◽  
Production Efficiency ◽  
Scanning Speed ◽  
Bainitic Steel ◽  
Laser Remelting ◽  
Melted Layer ◽  
Laser Scanning Speed ◽  
And Performance ◽  
Nanoindentation Instrument

The surface of bainitic steel was remelted by fiber laser, and the microstructure and mechanical properties of the melted layer were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), a nanoindentation instrument, and wear equipment. The study of changing the laser scanning speed showed that the depth of the melted layer increases with decreases of the laser scanning speed. The wear-resistance property increased by 55% compared with the matrix and decreased with the reduction of laser scanning speed within a certain range. In the study of changing the laser-scanning space, the thermal effect of laser melting in the back channel on the front channel was further validated. At the same time, it was found that the solidified layer surface of hardness alternating with softness can be obtained by appropriately expanding the scanning space, which is conducive to improving the wear-resistant properties of the steel surface, and properly improving the production efficiency of the laser remelting treatment.

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 on the influence of laser scanning speed on Fe-based amorphous coating organization and performance

2021 ◽  
Vol 136 ◽  
pp. 107266
Author(s):  
Hao-zheng Wang ◽  
Yan-hai Cheng ◽  
Wei Song ◽  
Jin-yong Yang ◽  
Xiu-bing Liang
Keyword(s):  
Laser Scanning ◽  
Scanning Speed ◽  
Amorphous Coating ◽  
Laser Scanning Speed ◽  
And Performance

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.

Effect of laser scanning speed on microstructure and wear properties of T15M cladding coating fabricated by laser cladding technology

2018 ◽  
Vol 110 ◽  
pp. 163-171 ◽  
Author(s):  
Xiangyi Jiao ◽  
Jun Wang ◽  
Canming Wang ◽  
Zhengqi Gong ◽  
Xinxing Pang ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Wear Properties ◽  
Laser Scanning Speed

Dissolution Behavior of WC Reinforced Particles on Carbon Steel Surface during Laser Cladding Process

2012 ◽  
Vol 430-432 ◽  
pp. 137-141 ◽  
Author(s):  
Zhong Zhang ◽  
Hong Xi Liu ◽  
Xiao Wei Zhang ◽  
Sheng Wei Ji ◽  
Ye Hua Jiang
Keyword(s):  
Carbon Steel ◽  
Composite Coating ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Energy Dispersive Spectrometer ◽  
Scanning Speed ◽  
Decomposition Reaction ◽  
Medium Carbon Steel ◽  
Dissolution Behavior ◽  
Laser Scanning Speed

Ni60WC35 self-fluxing composite coating was fabricated by transverse-flow CO2 laser apparatus on 45 medium-carbon steel surfaces. The microstructure and phase transform behavior of WC reinforced particles under the laser cladding conditions was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS). The results show that laser scanning speed has a great important influence on the microstructure of Ni-based WC composite coating, WC particles has a transition to the Ni-based coating. The main feature of WC particle is its edge hard phase has transformed into needle phase, and the needle phase areas increase with the decrease of the laser scanning speed. Some WC particles turn into needle clusters structure, and then white block phase. In addition, WC particle has some microscopic defects, and the surface priority defect can be dissolved. When the pool temperature rises to 1250°C, WC decomposition reaction become W2C and C. The elements diffusion can promote the dissolution of WC particles when the pool temperature rises continuously.

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.

scholarly journals Investigation on Microstructure, Hardness, and Corrosion Resistance of Mo–Ni–B Coatings Prepared by Laser Cladding Technique

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 856 ◽  
Author(s):  
Xiaojie Ni ◽  
Shengze Wang ◽  
Yuantao Zhao ◽  
Wenge Li ◽  
Xiong Jiao
Keyword(s):  
Corrosion Resistance ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Bottom Layer ◽  
Scanning Speed ◽  
Corrosion Current ◽  
Corrosion Resistant ◽  
Cermet Coatings ◽  
Laser Scanning Speed ◽  
Corrosion Resistant Coatings

The hard and corrosion resistant coatings of Mo2NiB2 cermet were prepared by the laser cladding technique. The influences of the Mo:B ratio and the laser scanning speed on the microstructure and property of the Mo2NiB2 cermet coatings were investigated. The results showed that the laser scanning speed of 1.5 mm/s and the Mo:B ratio of 1 were more beneficial to the formation of Mo2NiB2 cermet than 2.0 mm/s and 0.8, 1.2, respectively. The amount of the Mo2NiB2 ceramic phases were decreased from the top layer to the bottom layer of the coating. The changes of microstructure and composition led to the changes of hardness and corrosion resistance of the Mo2NiB2 cermet coatings. The coating prepared at the Mo:B ratio of 1 and the scanning speed of 1.5 mm/s possessed the highest hardness, and the hardness gradually decreased from the top layer to the bottom layer of the coating. The formation of Mo2NiB2 and {FeM} phases led to the enhanced corrosion resistance of the Mo2NiB2 cermet coatings, and the coating prepared at the Mo:B ratio of 0.8 possessed the best corrosion resistance and the minimum corrosion current.

Laser Cladding In Situ Tungsten Carbide Reinforced Ferrous Matrix Surface Composites

2011 ◽  
Vol 189-193 ◽  
pp. 771-776 ◽  
Author(s):  
Ying Ying Chen ◽  
Wen Ge Li
Keyword(s):  
Tungsten Carbide ◽  
Laser Cladding ◽  
Laser Power ◽  
Laser Scanning ◽  
Synthesis Method ◽  
Scanning Speed ◽  
Hardness Measurement ◽  
Element Distribution ◽  
Matrix Surface ◽  
Laser Scanning Speed

Tungsten carbide cermets coating on carbon steel were fabricated by laser clad cooperation combustion synthesis method. The microstructure, phase, element distribution and microhardness have been analyzed with the aid of SEM, XRD, EDS, EPMA and microhardness-tester. It is shown that the coating consisted of WC, CW3, W2C, WCx, and FeNi3. The results of hardness measurement showed that the hardness was superior to substrate. Analyze the effect of different laser power and different laser scanning speed on the quality of the laser cladding surface, the surface quality gets better with the increasing of the laser power, and gets better with the reducing of the scanning speed.

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