The Temperature Field Simulation during Laser Cladding Process

2012 ◽  
Vol 450-451 ◽  
pp. 235-238
Author(s):  
Qiu Yue Jiang
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
Laser Cladding ◽  
Initial Temperature ◽  
The Finite Element Method ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
Simulation Results ◽  
The Mathematical Model ◽  
Variation Simulation

The mathematical model of the Temperature field of the power feeding laser cladding was found by the finite element method .To simulate the process of cladding temperature distribution, the simulation results and experimental results were conform, showed that this method can be used for controlling laser cladding process parameters by calculating the initial temperature and non-contact measurement of the temperature variation. Simulation results showed that the laser cladding process heat and cool speedy , The temperature gradient is large, the largest temperature gradient is in the vicinity of melt pool and the border of cladding layer and the substrate.

Geometry Modelling of Clads Generated by Laser Cladding

2012 ◽  
Vol 713 ◽  
pp. 85-90
Author(s):  
I. Tabernero ◽  
Aitzol Lamikiz ◽  
Eneko Ukar ◽  
S. Martínez
Keyword(s):  
Laser Cladding ◽  
Particle Concentration ◽  
Cfd Model ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
The Finite Difference Method ◽  
Input Variables ◽  
Minimum Heat ◽  
Pool Area ◽  
Deposition Techniques

The laser cladding process is based on the generation of a melt-pool in a substrate where a filler material is injected, generating a high quality clad with a minimum heat affected zone. This process is industrially used to generate coatings over wear or damaged surfaces, being an alternative to traditional deposition techniques. One of the most important aspects for its industrial application is to know the clad geometry in order to calculate the deposited layer thickness. This work presents a model in which, starting from the concentration of injected material and the melt-pool geometry, clad height is finally estimated. Both input variables are obtained by two previous validated models. On one hand, the melt pool is estimated by a thermal model based on the finite difference method, and on the other hand, concentration of injected material is provided by a particle concentration CFD model. This data is used in a mass balance over melt-pool area in order to estimate the deposited clad height.

Modeling on Laser Cladding on In718 Superalloy

2011 ◽  
Vol 80-81 ◽  
pp. 46-50
Author(s):  
Qing Ming Chang ◽  
Chang Jun Chen ◽  
Xia Chen ◽  
Si Qian Bao ◽  
Chen Gang Pan
Keyword(s):  
Laser Cladding ◽  
Process Parameters ◽  
Scanning Speed ◽  
Beam Diameter ◽  
Numerical Resolution ◽  
Applied Loading ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
In718 Superalloy ◽  
Complex Boundary

A 3-D modeling based on the numerical resolution of fluid flow and heat transfer for laser-cladding processes of In718 Superalloy is proposed. The implementation of developed procedures allowed us to treat the problem with specific and complex boundary conditions. The applied loading is a moving heat source that depends on process parameters such as power density, laser beam diameter and scanning speed. The effects of process parameters on the melt pool are quantitatively discussed by numerical analysis. The computational results present good coincidences with the corresponding experiments of laser cladding process.

Simulation and Analysis on the Temperature Distribution of the Heating Channel in a Washer-Dryer

2013 ◽  
Vol 437 ◽  
pp. 226-230
Author(s):  
Qi Xia You ◽  
Fei Lu ◽  
Yun Fei Chen ◽  
Jian Run Zhang
Keyword(s):  
Temperature Field ◽  
Heating System ◽  
Heating Channel ◽  
The Finite Element Method ◽  
Average Temperature ◽  
Coupled Heat Transfer ◽  
Airflow Field ◽  
Heat Transfer Simulation ◽  
Simulation Results ◽  
Test Result

In order to study the characteristics of the temperature field of the heating system in a washer-dryer, a numerical model to compute airflow field and temperature field is established according to the theory of fluid-solid coupled heat transfer. Simulation is realized based on the finite element method and verified with tests. The simulation results are in good consistency with the test result on the three aspects of temperature distributions, ranges and fluctuation tendencies. The errors of the lowest, highest and average temperature are all within 5.38%. Influencing factors leading to the offset of the high-temperature region in the downstream heating channel can be found from the valid simulation and they can provide theoretical basis for further optimization. The simulation results show that the configuration of the part of channel between the volute tongue and the heater leads to the transverse offset, and the triangular hump leads to the longitudinal offset.

Simulation Study of the Temperature Field for Squashed Presetting Laser Cladding Based on ANSYS

2010 ◽  
Vol 458 ◽  
pp. 319-324 ◽  
Author(s):  
Gang Chen ◽  
Xiang Feng Li ◽  
Dun Wen Zuo ◽  
Hong Yu Wang ◽  
Yan Jiang
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
Contact Resistance ◽  
Laser Cladding ◽  
Process Parameters ◽  
Simulation Study ◽  
Molten Pool ◽  
Organizational Form ◽  
Physical Parameters ◽  
Pore Model

In the process of modeling the squashed piece of powders for the simulation of the temperature field of laser cladding, the metallurgical model and the pore model were proposed separately. The effects of the organizational form, the contact resistance and the thickness of the squashed piece of powders on the temperature were considered. Different values of physical parameters of the squashed piece of powders were converted, different contact resistances were calculated and the laser absorptivity for different process parameters of laser cladding was determined. The temperature curves of six typical nodes and the temperature gradient of two nodes in the molten pool of the substrate were discussed from different aspects.

Laser Cladding of Ni Based Cermets

2006 ◽  
Vol 514-516 ◽  
pp. 723-728 ◽  
Author(s):  
Maria José Tobar ◽  
José Manuel Amado ◽  
Carlos Álvarez ◽  
German Rodríguez ◽  
Armando Yáñez
Keyword(s):  
Melting Point ◽  
Laser Cladding ◽  
Interesting Property ◽  
Major Influence ◽  
Gas Flows ◽  
Tungsten Carbides ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
Plasma Sprayed ◽  
Processing Techniques

The self fluxing NiCrBSi alloys can produce coating layers by means of laser processing techniques. Main procedures are the laser post-treatment of previously thermal or plasma sprayed coats and the laser cladding, for which preplaced or continuously delivered powder (in this case aided by powder feeders) can be used. NiCrBSi alloys have an interesting property due to the presence of boron and silicon in its composition: they exhibit a relatively low melting point, making the laser cladding process easier. The layers obtained on metallic based materials are resistant to high temperature erosion wear and corrosion. However, if additional abrasive wear resistance is needed, the feeding with ceramic powders such as tungsten carbides (WC) is required. The high melting point of ceramics makes the laser cladding process complicated as the melt pool is made up of liquid metal plus not totally melted ceramic particles and the whole suffers the effect of the shielding and carrying gas flows, producing undesired instabilities. In this paper several combination of WC and NiCrBSi powders were tested. It is shown that the WC fraction in the mixture has a major influence on the obtention of pore and crack free clad layers. Bellow a certain ratio the meltpool appears to be more stable and less affected by the different gas flows used in the process, yielding dense NiCrBSi coatings with rather evenly distributed WC particles. In these conditions, the analysis and characterization of the produced coatings shows that the microstructure gains homogeneity without decreasing too much microhardness if compared with the pure ceramic layers.

The Finite Element Simulation Research on Stress-Strain Field of Laser Cladding

2008 ◽  
Vol 373-374 ◽  
pp. 322-325
Author(s):  
Ping Zhang ◽  
Lin Ma ◽  
Jin Ping Yuan ◽  
Xiao Nan Yin ◽  
Zhi Hai Cai
Keyword(s):  
Temperature Field ◽  
Plastic Strain ◽  
Laser Cladding ◽  
Strain Field ◽  
Field Model ◽  
Intersection Point ◽  
Stress Strain ◽  
Temperature Variations ◽  
Thermal Boundary Conditions ◽  
Laser Cladding Process

The tensile plastic strains and the residual tensile stresses caused by heat input during the laser cladding process are the main reasons for the cracking. In this paper, the laser cladding process on a type 1045 steel plate with Ni60 powder feeding was investigated and simulated by finite element method to analyze the temperature field and stress-strain field of the laser cladding process. In the temperature field model, the main considerations were given to the heat source data and the thermal boundary conditions. The interactions of laser, powders and base metal were mainly considered in the application of the heat source data. The relationship between the heat convection coefficient of work piece surface and the temperature variation was mainly considered in the application of thermal boundary conditions. In the stress-strain field model, the main consideration was given to the elastic-plastic characteristics of the materials, and the materials were assumed to be linear strain-strengthened. Moreover, the thermal stresses could be solved through the temperature field and were subsequently applied directly to the stress-strain field model as loads. Besides the temperature variations, the stress variations and the strain variations of some critical points (including the crest point of the cladded layer and intersection point of cladded layer and plate) were also obtained through the finite calculation. The temperature variations show that the heating curve is approximately a straight line while the cooling curve is like an arm of a hyperbola. The strain variations show that the thermal strain has a variation trend similar to the temperature variations. The elastic strain of each point is very low when compared to the plastic strain. The calculated results show that the tensile plastic strain of the crest point on the coating is the greatest in the cladding direction and the tensile stress in this direction of this point is great too. As a result, transverse crack can be easily initiated at the crest of the coating. While the tensile plastic strain at the intersection point of the base metal and coating is the greatest in the direction vertical to the plate thickness, the stress at this point (in the same direction) is compressive. Therefore, the intersection points tend to form a limited toe crack which can not grow.

Researches on the Temperature Field during the Process of Reparation by Laser Cladding through Simulation and Experiments

2017 ◽  
Vol 893 ◽  
pp. 281-288
Author(s):  
Xiang Zhang ◽  
Wei Fu ◽  
Qi Lin Deng
Keyword(s):  
Temperature Field ◽  
Laser Cladding ◽  
Bonding Strength ◽  
Thermal Deformation ◽  
Process Temperature ◽  
Cladding Layer ◽  
Metallurgical Bonding ◽  
Laser Cladding Process

During the laser cladding process, temperature field is an issue worth thorough research. An optimized temperature field can not only ensure the high metallurgical bonding strength between the cladding layer and the substrate, but also can produce relatively mild thermal deformation for the parts to be repaired. This work theoretically analyzes the temperature field during the cladding process and validate the analysis through the microstructure of the cladding layer.

scholarly journals Research On Energy Distribution and Solidification Characteristics During Laser Cladding Based On Numerical Simulation

2021 ◽  
Author(s):  
Wenhui Yang ◽  
Yanhai Cheng ◽  
Yipeng Zhang ◽  
Jinyong Yang ◽  
Xiubing Liang
Keyword(s):  
Surface Modification ◽  
Numerical Model ◽  
Energy Distribution ◽  
Laser Cladding ◽  
Laser Energy ◽  
Solidification Rate ◽  
Melt Pool ◽  
Laser Cladding Process ◽  
Calculation Results ◽  
Effects Of Temperature

Abstract Laser cladding as an emerging surface modification technology can be widely adopted for surface modification. In this study, 27SiMn was selected as the substrate, the powder was a self-made iron-based alloy, and the thermophysical properties of the material were predicted by the CALPHAD algorithm. The numerical model of the laser cladding process is established by setting reasonable hypothetical condition, initial condition, boundary condition, and solver parameters. In order to verify the accuracy of the numerical model, 10 sets of experiments have been carried out, and the agreement between the model calculation results and the experimental results reached 92%. Through the study of energy distribution in the laser cladding process, it is found that about 10% of the laser energy is used to heat the substrate to form a melt-pool, and at least 53% of the energy is radiated into the environment. Finally, the effects of temperature gradient and solidification rate on the microstructure of the cladding layer were explored.

Finite Element Analysis of the Temperature Field and Strain Field of Coating Rod in Friction Surfacing

2010 ◽  
Vol 97-101 ◽  
pp. 1433-1437
Author(s):  
Xue Mei Liu ◽  
Zeng Da Zou ◽  
Xin Hong Wang ◽  
Shi Yao Qu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Strain Field ◽  
Radial Direction ◽  
Effective Strain ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Friction Surfacing ◽  
Simulation Results

In friction surfacing process, the temperature field and strain field, especially of coating rod, is considered an important element in analyzing the process’ mechanism and choosing the key process parameters properly. In this paper, the finite element method was employed to simulate the coupling of 3-D temperature field and deformation field of coating rod during friction surfacing. The simulation results show that at the preliminary preheating period, the isotherm goes down at the center part, and the temperature field presents “M” along the radial direction. The temperature increasing rate at the friction interface is higher at first, and then become lower, once the friction system becomes quasi-steady, the temperature here will be stable approximately. The largest effective strain occurs near the center of bottom circle. The simulation results are close to the experimental results, thus builds a basis for analyzing the process’s mechanism, allows for theoretical guidance for analyzing feasibility and helps optimize key parameters.

scholarly journals Thermal Stress Cycle Simulation in Laser Cladding Process of Ni-Based Coating on H13 Steel

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 203
Author(s):  
Fangping Yao ◽  
Lijin Fang
Keyword(s):  
Thermal Stress ◽  
Laser Cladding ◽  
Molten Pool ◽  
Scanning Speed ◽  
H13 Steel ◽  
Stress Cycle ◽  
Cladding Layer ◽  
Laser Cladding Process ◽  
Simulation Results ◽  
Peak Value

In order to improve the work efficiency and save resources in the process of laser cladding on the H13 steel surface, based on COMSOL, by combining computer simulation and experiment, a plane continuous heat source model was used to simulate and analyze the temperature and stress field. The optimal power and scanning speed were obtained. It is found in the simulation process that the thermal sampling points stress increases with the increase of laser power and scanning speed. Because of the existence of solid–liquid phase variation in the laser cladding process, there are two peaks in the maximum thermal stress cycle curve of the sample points located in the molten pool, and the starting and ending time of each sample point’s peak value is basically the same. When the sample point is outside the molten pool, because the metal at the corresponding location is not melted, so there is no obvious peak value in the thermal stress cycle curve. With the increase of cladding layer depth corresponding to each sample point, the variation range of the two alternating thermal stress peaks increases first and then decreases, while the duration increases. According to the peak value of alternating thermal stress at the sampling point, the molten pool depth can be predicted. The residual stress analysis of the cladding layer is carried out according to the analysis results of temperature field and stress field. Through the actual cladding experiment, it is found that the depth of molten pool in the simulation results is basically consistent with the experimental results. All simulation results are verified through actual cladding experiments.

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