The Finite Element Analysis of Flow Field and Temperature Field in the Molten Pool of Surface Treatment by Electron Beam

2012 ◽  
Vol 591-593 ◽  
pp. 908-911
Author(s):  
Rong Wang ◽  
Guo Bin Shen ◽  
De Qiang Wei
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Electron Beam ◽  
Liquid Metal ◽  
Flow Field ◽  
Flow Velocity ◽  
Molten Pool ◽  
Driving Forces ◽  
Specimen Thickness ◽  
Beam Spot

A finite element model was established to describe the flow field and temperature field during the surface modification by electron beam in this paper. The driving forces of molten pool were considered in the mode. The flow of liquid metal was different between the inside and outside of the beam spot; the direction of the flow was along the surface to the specimen thickness. When the liquid metal was in the bottom of the pool, it flowed along the bottom to the pool edge. The largest flow velocity was 0.28m/s in the center of the beam spot, the minimum flow velocity was 0.11 m/s in the bottom of molten pool. The temperature of sample is uniform distribution, the temperature distribution show a gradient distribution in cross section.

Numerical Analysis of Flow Fields and Temperature Fields in a Regenerative Heating Furnace for Steel Pipes

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
Yi Han ◽  
Feng Liu ◽  
Xin Ran
Keyword(s):  
Temperature Field ◽  
Flow Field ◽  
Flow Velocity ◽  
Gas Flow ◽  
Flow Fields ◽  
Heating Furnace ◽  
Temperature Fields ◽  
Turbulent Layer ◽  
Steel Pipes ◽  
Pipe Blanks

In the production process of large-diameter seamless steel pipes, the blank heating quality before roll piercing has an important effect on whether subsequently conforming piping is produced. Obtaining accurate pipe blank heating temperature fields is the basis for establishing and optimizing a seamless pipe heating schedule. In this paper, the thermal process in a regenerative heating furnace was studied using fluent software, and the distribution laws of the flow field in the furnace and of the temperature field around the pipe blanks were obtained and verified experimentally. The heating furnace for pipe blanks was analyzed from multiple perspectives, including overall flow field, flow fields at different cross sections, and overall temperature field. It was found that the changeover process of the regenerative heating furnace caused the temperature in the upper part of the furnace to fluctuate. Under the pipe blanks, the gas flow was relatively thin, and the flow velocity was relatively low, facilitating the formation of a viscous turbulent layer and thereby inhibiting heat exchange around the pipe blanks. The mutual interference between the gas flow from burners and the return gas from the furnace tail flue led to different flow velocity directions at different positions, and such interference was relatively evident in the middle part of the furnace. A temperature “layering” phenomenon occurred between the upper and lower parts of the pipe blanks. The study in this paper has some significant usefulness for in-depth exploration of the characteristics of regenerative heating furnaces for steel pipes.

Numerical Simulation of Three-Dimensional Molten Pool Temperature Field and Flow Field for Laser Melt Injection Based on Fluent

2012 ◽  
Vol 538-541 ◽  
pp. 1837-1842 ◽  
Author(s):  
Long Zhi Zhao ◽  
Zi Wang ◽  
Xin Yan Jiang ◽  
Jian Zhang ◽  
Ming Juan Zhao
Keyword(s):  
Temperature Field ◽  
Liquid Metal ◽  
Molten Pool ◽  
Metal Flow ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Liquid Metal Flow ◽  
Fluent Software ◽  
Thermo Physical Properties

According to the characteristics of laser melt injection, a numerical model for a simplified 3D transient temperature field in molten pool was established using FLUENT software in this paper. In the model, many factors were considered such as liquid metal turbulence, latent heat of phase transformation and material thermo physical properties depending on temperature. The results show that the model can be developed well by FLUENT software. And the results also show that the driving force of the liquid metal flow mechanism.

scholarly journals Finite element simulation and microstructure analysis of nickel based alloy for additive manufacturing

2018 ◽  
Vol 242 ◽  
pp. 01022
Author(s):  
Liu Heping ◽  
Sun Fenger ◽  
Yibo Fenger ◽  
Cheng Shaolei ◽  
Liu Bin
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Temperature Gradient ◽  
Heat Source ◽  
Finite Element Simulation ◽  
Molten Pool ◽  
Laser Melting ◽  
Front End ◽  
Element Simulation ◽  
Laser Heat Source

In this paper, the finite element simulation of GH4169 high temperature alloy by selective laser melting was carried out, and the microstructure was analyzed by experiments. The results show that the shape of the temperature field cloud formed by the laser heat source is different from the shape of the theoretical model, but is in the shape of the ellipse. The temperature gradient at the front end of the molten pool is larger than that of the back end of the molten pool, and the isotherm of the front end of the molten pool is more intensive. The temperature of the substrate is less affected by the temperature gradient. The temperature gradient of the front end of the melting pool is larger than the back end of the molten pool, and the temperature field of selective laser melting is like a meteor with trailing tail. In the laser heat source, the temperature isotherm is the most dense and the temperature gradient is maximum. The relative effect of mechanical properties of δ phase is very complex. When the phase is precipitated by widmanstatten structure, it is easy to produce stress concentration as a source of cracks

Microstructures in Solidification Simulation of Electron Beam Scanning with MC in Molten Pool

2014 ◽  
Vol 898 ◽  
pp. 168-172 ◽  
Author(s):  
Rong Wang ◽  
Yi Liu ◽  
De Qiang Wei
Keyword(s):  
Mathematical Model ◽  
Temperature Field ◽  
Electron Beam ◽  
Grain Growth ◽  
Molten Pool ◽  
Growth Process ◽  
Solidification Process ◽  
Optical Microscope ◽  
Physical Parameters ◽  
Beam Scanning

The solidification microstructure of electron beam scanning is important to product performance. The solidification process of molten pool temperature field and 2D simulation mathematical model of grain growth was established based on heat transfer and the physics of growth process of crystal grains. The heat distribution, thermal physical parameters and influence of thermal radiation on the temperature field was considered during the analysis process. The distribution of temperature field was solved by COMSOL. The process of solidification was simulated by using Monte Carlo method. Using optical microscope to observe the solidified microstructure of bath. The simulation results show that the mathematical model can reasonably describe the grain growth process, the temperature field and the simulation of microstructure morphology.

scholarly journals 3D Thermal Finite Element Analysis of the SLM 316L Parts with Microstructural Correlations

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Ketai He ◽  
Xue Zhao
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Molten Pool ◽  
Steel Powder ◽  
Element Model ◽  
Maximum Temperature ◽  
Element Analysis ◽  
Measurement Results ◽  
Scanning Strategies ◽  
Maximum Temperature Gradient

In this study, a multitrack and multilayer finite element model was developed to simulate the temperature field and molten pool contours during selective laser melting (SLM) of 316L stainless steel powder under different scanning strategies. The simulated temperature field and its evolution over time were compared with experimental measurement results. Furthermore, a correlation was established by the presented results between the predicted thermal behavior and the microstructure of SLM specimens. It was found that the maximum temperature of the molten pool rose slightly with the increase of scanning tracks, but when laser scanned multilayer, the maximum temperature rose first and then decreased. There are large columnar crystals in molten pools, growing in the direction of the maximum temperature gradient. The microstructure defects are more likely to occur at the bonding regions between adjacent layers and islands, where the heat and stress are concentrated. Moreover, the results also showed that the scanning strategy affects the microstructure and microhardness. Also, the SLM 316L parts under the S-shaped strategy had finer grains and a higher Vicker hardness than that formed under the island strategy.

Temperature Field Simulation of Electron Beam Cladding W Coating on Cu Substrate

2015 ◽  
Vol 1094 ◽  
pp. 331-334
Author(s):  
Li Wan ◽  
Yi Ping Huang ◽  
Rui Bin Zhang ◽  
Hai Hua Yu ◽  
Hang Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Electron Beam ◽  
Cooling System ◽  
Tungsten Powder ◽  
Element Model ◽  
Field Calculation ◽  
Element Analysis ◽  
Heating And Cooling ◽  
Calculation Results

A 3D Finite Element Model of the Temperature Field for Electron Beam Cladding of Pre-Tungsten Powder on the Surface of the Copper Block was Established, According to the Actual Situation of the Electron Beam Cladding Process, Based on Finite Element Analysis Software ANSYS Workbench, Analyzed the Temperature Field Distribution of the Electron Beam Cladding Process. Temperature Field Calculation Results Showed that the Cladding Process Heating and Cooling Speed was up to 103-104°C/s, and the Surface Temperature Increased Rapidly, while the Temperature of the Substrate Maintained Low, since the Water Cooling System.

Study on Aerodynamic Properties of Impact Plate

2012 ◽  
Vol 157-158 ◽  
pp. 970-975
Author(s):  
Xiao Wei An ◽  
Shu Ping Zheng ◽  
Yu Jie Ji
Keyword(s):  
Finite Element ◽  
Flow Field ◽  
Finite Element Model ◽  
Flow Velocity ◽  
Element Model ◽  
External Flow ◽  
Aerodynamic Properties ◽  
Flow Pressure ◽  
Impact Plate ◽  
Distribution Of Flow

An aero dynamical finite element model on rotary hammering test stand was established in this paper. The external flow field of the model was analyzed by CFD module of ANASYS-FLOTRAN. The distribution of flow velocity and that of flow pressure were obtained, which were analyzed to provide theoretical references for optimum design of impact plate.

Analysis and Improvement on Acoustic Performance of Muffler with the Consideration of Temperature and Flow Velocity

2014 ◽  
Vol 875-877 ◽  
pp. 1143-1147
Author(s):  
Yi Xiang Hu ◽  
Shun Ming Li ◽  
Qing Liu
Keyword(s):  
Temperature Field ◽  
Flow Field ◽  
Flow Velocity ◽  
Output Power ◽  
Insertion Loss ◽  
Structural Parameters ◽  
Acoustic Fields ◽  
Influence Of Temperature ◽  
Acoustic Performance ◽  
Field Temperature

Aiming for the acoustic performance of expanded-muffler, the acoustic fields, flow field, temperature field and flow regenerated noise inside the expanded-muffler were studied. Furthermore, with the consideration of temperature and flow velocity, the influence of temperature and flow velocity on acoustic performance was obtained. Based on the research, the acoustic performance of an exhaust muffler was studied. By adjusting the structural parameters, without affecting the engine output power, the insertion loss of muffler has average increased by 5.1 dB (A).

Numerical Simulation of Electromagnetic flow, Temperature Field and Flow Field in Laser Molten Pool with Electromagnetic Stirring

2015 ◽  
Vol 42 (2) ◽  
pp. 0202007 ◽  
Author(s):  
王维 Wang Wei ◽  
刘奇 Liu Qi ◽  
杨光钦 Yang Guang ◽  
兰云 Qin Lanyun ◽  
薛雄 Xue Xiong
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Flow Field ◽  
Molten Pool ◽  
Electromagnetic Stirring ◽  
Flow Temperature ◽  
Electromagnetic Flow

Finite Element Analysis of Flow Field and Temperature Field in Continuous Casting Mold

2012 ◽  
Vol 601 ◽  
pp. 270-274
Author(s):  
Xiao Jun Zhang ◽  
Hai Zhang ◽  
Ze Ning Xu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Field ◽  
Flow Field ◽  
Continuous Casting ◽  
Continuous Casting Mold ◽  
Element Analysis ◽  
Casting Mold ◽  
Withdrawal Speed ◽  
Simulation Results

Researching on continuous casting mold at a domestic steel slab, the coupled models of flow field and temperature field inside of mold were established in finite element analysis software ANSYS, and the flow field and temperature field of liquid steel in mold was simulated. The effect on flow field and temperature field in continuous casting mold caused by change of the withdrawal speed was mainly discussed in this paper. The simulation results show that the change of withdrawal speed has little effect on flow field and much effect on temperature distribution in mold. The simulation results are good agreed with the practical produce data, verifying the accuracy of the numerical simulation analysis, which provide theoretical basis and effective guidance for improving process and increasing yield in practical production.

Sign in / Sign up

Export Citation Format

Share Document