Numerical model of transient convection pattern and forming mechanism of molten pool in laser cladding

2019 ◽  
Vol 75 (12) ◽  
pp. 855-873 ◽  
Author(s):  
Boxue Song ◽  
Tianbiao Yu ◽  
Xingyu Jiang ◽  
Wenchao Xi
Keyword(s):  
Numerical Model ◽  
Laser Cladding ◽  
Molten Pool ◽  
Convection Pattern ◽  
Forming Mechanism

A Numerical Simulation for Fluid Flow and Temperature Field in the Molten Pool of Laser Cladding on Titanium Alloy

Applied laser ◽  
2014 ◽  
Vol 34 (5) ◽  
pp. 389-394
Author(s):  
王维 Wang Wei ◽  
刘奇 Liu Qi ◽  
杨光 Yang Guang ◽  
钦兰云 Qin Lanyun ◽  
薛雄 Xue Xiong
Keyword(s):  
Numerical Simulation ◽  
Titanium Alloy ◽  
Temperature Field ◽  
Fluid Flow ◽  
Laser Cladding ◽  
Molten Pool

Detection and Analysis of Spectrum Distribution of Laser Molten Pool in Nickel Silicon Boron Alloy Powder Laser Cladding

2014 ◽  
Vol 41 (11) ◽  
pp. 1103009
Author(s):  
顾振杰 Gu Zhenjie ◽  
雷剑波 Lei Jianbo ◽  
张传鹏 Zhang Chuanpeng ◽  
王云山 Wang Yunshan
Keyword(s):  
Laser Cladding ◽  
Molten Pool ◽  
Alloy Powder ◽  
Spectrum Distribution ◽  
Nickel Silicon

The Software Development of Double-Beam Centroid Distance Measurement System in Laser Cladding Forming Process

2011 ◽  
Vol 464 ◽  
pp. 524-527
Author(s):  
Cheng Feng Sun ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Chun Sheng Li
Keyword(s):  
Laser Cladding ◽  
Molten Pool ◽  
Forming Process ◽  
Development Platform ◽  
Laser Head ◽  
Centroid Distance ◽  
Double Beam ◽  
Spot Image ◽  
The Stability ◽  
Effect Of Light

In the high-piled up process of laser cladding rapid forming , the distance between aser molten pool center and flour will increase along with the cladding layer ,which will cause the effect of light powder coupling getting worse, even directly lead to failure. The article proposed characteristics of the double-spot ,formed by molten pool and reflection of laser surface;used VC++ 6.0 as the development platform of image processing to calculate two spot centroid distance by dealing two spot image with the process of gray processing, Gaussian smoothing, binary threshold segmentation, area centroid calculation, the centroid coordinate distance calculation.At the same time , controlling laser head Z to move in accordance with the value increment,to increase the stability of forming process and forming quality.

The Effect of Thermal Field on the Deposition of Fe-TiC on Carbon Steel Using Laser Cladding

2010 ◽  
Author(s):  
Masoud Alimardani ◽  
Ali Emamian ◽  
Amir Khajepour ◽  
Stephen F. Corbin
Keyword(s):  
Carbon Steel ◽  
Numerical Model ◽  
Laser Cladding ◽  
Thermal Field ◽  
Deposition Process ◽  
Time Dependent ◽  
Experimental Investigations ◽  
Thermal Fields ◽  
Temperature Distributions ◽  
Laser Cladding Process

In this paper, a numerical and experimental method is used to investigate the effect of thermal fields on the deposition of Fe-TiC using the laser cladding process. Since in laser cladding temperature distributions and consequent rapid cooling rates determine the microstructure and final physical properties of the deposited layers, a 3D time-dependent numerical model is used to simulate the cladding process parallel to experimental analysis. The numerical results are used to study the temperature distributions and their evolutions throughout the deposition process. The experimental and verified numerical outcomes are then employed to study the variations of the microstructures of the deposited material as well as correlation between the formed microstructures and temperature distributions across the deposition domain. The numerical and experimental investigations are conducted through the deposition of Fe-TiC on the substrate of AISI 1030 carbon steel using a 1.1 kW fiber laser. The experimental results confirm that by increasing the substrate temperature throughout the process the distribution of the TiC particles changes along with the deposited tracks and the TiC particles start forming clusters at the top of the clad.

Design of Forming Shape Measurement System for Laser Molten Pool in Laser Fabricating

2010 ◽  
Vol 37-38 ◽  
pp. 327-330 ◽  
Author(s):  
Jian Bo Lei ◽  
Zhen Wang ◽  
Li Feng Liu
Keyword(s):  
Laser Cladding ◽  
Molten Pool ◽  
Detection System ◽  
Shape Measurement ◽  
Optical Elements ◽  
Shape Distribution ◽  
Special Software ◽  
Measurement Results ◽  
Destructive Measurement ◽  
Non Destructive

In order to study forming shape distribution of laser molten pool in laser fabricating, a CCD-based image detection system was developed. The system mainly consists of a CCD-based detector, optical elements, an image acquisition card and its special software. Experiments on shape measurement of the laser molten pool were carried out. It was shown that 2D morphology and the dimension of laser molten pool could be measured in real time. The (X, Y) dimension of the laser molten pool in laser cladding was (2.6 mm, 2.5 mm) with an approximately ellipsoidal shape. Laser cladding parameters were optimized according to the measurement results. It was a non-destructive measurement method, which would be a new method for online measurement and feedback control in laser fabricating.

Hybrid forming mechanism of patternless casting and laser cladding

2019 ◽  
Vol 14 (4) ◽  
pp. 393-401
Author(s):  
Zhongde Shan ◽  
Fuzhen Sun ◽  
Yang Liu
Keyword(s):  
Laser Cladding ◽  
Forming Mechanism

Effects of electromagnetic compound field on the escape behavior of pores in molten pool during laser cladding

2020 ◽  
Vol 383 ◽  
pp. 125198 ◽  
Author(s):  
Yong Hu ◽  
Liang Wang ◽  
Jianhua Yao ◽  
Hongchao Xia ◽  
Juehui Li ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Molten Pool ◽  
Escape Behavior

Study on Laser Cladding Coatings of Ni-Based Alloy/TiC/Nickel-Coated Graphite on Steel Substrate

2010 ◽  
Vol 450 ◽  
pp. 214-218 ◽  
Author(s):  
Li Xia Ying ◽  
Li Dong Jiang ◽  
Fan Kai Kong ◽  
En Xia Yang
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Laser Cladding ◽  
Metal Surfaces ◽  
Steel Substrate ◽  
Extreme Conditions ◽  
Cross Sectional ◽  
Graphite Composite ◽  
Forming Mechanism ◽  
Uniform Microstructure

In order to improve the antiwear and antifriction performances of tribological metal surfaces for the extreme conditions, the composite coating has been fabricated on metal surfaces by the technology of laser cladding. In the experiment, Ni-based alloy, TiC and Nickel-coated graphite are used as the main ingredients of composite. The cross-sectional macrographs, microstructure, compositions, microhardness, tribological properties and the forming mechanism of the coating was tested and analyzed. Results show that laser cladding Ni60A/TiC/Nickel-coated graphite composite can obtain excellent coating with fully compact and uniform microstructure, and good interface with the substrate. The microhardness of the clad coating is over HV1000, which is five times higher than that of the steel substrate. The friction coefficient is reduced to about 0.4-0.5 in comparison with that of the steel substrate (about 0.7-0.8). At the same time, the wear resistance of the clad coating is also improved greatly.

Modeling of temperature distribution and clad geometry of the molten pool during laser cladding of TiAlSi alloys

2021 ◽  
Vol 142 ◽  
pp. 107277
Author(s):  
Chen Shen ◽  
Chonggui Li ◽  
Yajun Guo ◽  
Chuanming Liu ◽  
Xuanjun Zhang ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Laser Cladding ◽  
Molten Pool

scholarly journals Numerical Analysis of Particulate Migration Behavior within Molten Pool during TIG-Assisted Droplet Deposition Manufacturing of SiC Particle-Reinforced Aluminum Matrix Composites

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2430
Author(s):  
Yubin Zhang ◽  
Jun Du ◽  
Huafeng Wang ◽  
Hua Li ◽  
Xiaoyun Zhao
Keyword(s):  
Numerical Model ◽  
Molten Pool ◽  
Aluminum Matrix ◽  
Heat Transfer Fluid ◽  
Aluminum Matrix Composites ◽  
Migration Behavior ◽  
Matrix Composites ◽  
Droplet Deposition ◽  
The Impact ◽  
Sic Particle

A transient three-dimensional (3D) numerical model was established to illustrate the heat transfer, fluid flow and particle migration behaviors in the molten pool during TIG-assisted droplet deposition manufacturing (DDM) of SiC particle-reinforced aluminum matrix composites (AMCs). The effect of temperature-dependent physical properties and the interaction between the SiC reinforcement and the liquid metal matrix were considered. A double-ellipsoidal volumetric heat source model was adopted to simulate the energy interactions between the pulse square-wave variable polarity TIG welding arc and the moving substrate. Free surface fluctuations of molten pool due to arc force and sequential droplet impact are calculated with volume of fluid (VOF) method in a fixed Eulerian structured mesh. The numerical model, capable of capturing the impact, simultaneous spread, and phase change of the droplets as well as the motion trajectory and terminate distribution state of the reinforcement particles, is key tool to understand the formation mechanism of the TIG-assisted DDM of SiC particle-reinforced AMCs. The numerical model was validated by the metallographic observations, and the calculated particle distribution and solidification morphology of deposited layer agree well with the experimental measurements.

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