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

Finite Element Simulation for Temperature Field of Nickels-based Alloy Based on DLMS

Applied laser ◽  
2010 ◽  
Vol 30 (4) ◽  
pp. 284-290
Author(s):  
凡进军 Fan Jinjun ◽  
赵剑峰 Zhao Jianfeng
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Finite Element Simulation ◽  
Element Simulation

Finite Element Simulation of Temperature Field in Plunge Milling Ti-6A1-4V at Cooling Condition

2011 ◽  
Vol 4 (3) ◽  
pp. 824-829
Author(s):  
Xuda Qin ◽  
Hao Jia ◽  
Xiaolai Ji ◽  
Xiaotai Sun ◽  
Qi Wang
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Finite Element Simulation ◽  
Cooling Condition ◽  
Plunge Milling ◽  
Element Simulation

Finite Element Simulation of Welding Sequences Effect on Residual Stresses in Multipass Butt-Welded Stainless Steel Pipes

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
S. Feli ◽  
M. E. Aalami Aaleagha ◽  
M. Foroutan ◽  
E. Borzabadi Farahani
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Heat Source ◽  
Residual Stresses ◽  
Finite Element Simulation ◽  
3D Model ◽  
Axisymmetric Model ◽  
Element Simulation ◽  
Starting Point ◽  
Welding Sequences

In this paper, a finite element simulation, based on abaqus software is presented for analyzing the temperature history and the residual stress states in multipass welds in stainless steel pipe. The uncoupled thermal–mechanical a three-dimensional (3D) model and a two-dimensional (2D) model are developed. The volumetric heat source with double ellipsoidal distribution for front and rear heat source, proposed by Goldak and Akhlaghi, has also been used. Furthermore, a moving heat source has been modeled by abaqus subroutine DFLUX. A user subroutine FILM has also been used to simulate the combined thermal boundary conditions. The results of both a 3D model and a 2D axisymmetric model which are compared with the available experimental measurements show good agreements. Predictions show that the axial and hoop residual stresses in a 3D model and a 2D axisymmetric model have the same distributions in all locations except the starting point of welding. The effects of welding sequences on the thermal and structural analysis are also investigated. Four types of welding sequences for circular welds of pipe have been used and thermal history and axial and hoop residual stresses are compared. Predictions show that for other locations (except the starting point of welding) there are no important differences of axial and hoop residual stresses for welding sequences and they have the same distribution along axial direction.

Test and Finite Element Simulation of Steady-State Temperature Field of Rolling Tire

2012 ◽  
Vol 236-237 ◽  
pp. 536-542 ◽  
Author(s):  
Xiang Lei Duan ◽  
Shu Guang Zuo ◽  
Yong Li ◽  
Chen Fei Jiang ◽  
Xue Liang Guo
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Steady State ◽  
Finite Element Simulation ◽  
Temperature Rise ◽  
Tire Pressure ◽  
Speed Factor ◽  
Element Simulation ◽  
Steady State Temperature ◽  
Single Factor Analysis

To analyze the steady-state temperature field, a three-factor orthogonal test was taken to study comprehensively how the load, speed and tire pressure can influence the tire temperature. The finite element simulation was carried out according to the uncoupled idea. Based on the single-factor analysis towards the speed factor, the actual convection coefficient of different boundaries was determined to calculate the steady-state temperature field at last. These analyses indicate that the tire temperature rise increase with the factor of load and speed, decrease with the increase of the initial tire pressure. The load has the biggest influence on the tire temperature rise, while the speed has the least. With the combination of steady-state temperature field and heat generation rate distribution, all these high-temperature regions can be explained clearly from the finite element perspective.

Defects Detection in Concrete Structure with Infrared Thermal Imaging and Numerical Simulation

2011 ◽  
Vol 378-379 ◽  
pp. 345-348
Author(s):  
Hong Guo Xu ◽  
Zhong He Shui ◽  
Bo Chen ◽  
Wei Chen ◽  
Sha Ding
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Finite Element Simulation ◽  
Thermal Imaging ◽  
Concrete Structure ◽  
Infrared Imaging ◽  
Imaging Method ◽  
Infrared Thermal Imaging ◽  
Element Simulation ◽  
Nondestructive Testing Method

In this paper, infrared imaging and temperature sensor monitoring equipment are used to detect the defect of concrete. By means of experiment and numerical analysis, a nondestructive testing method for concrete based on infrared thermal imaging and the finite element simulation of temperature field was established. Experimental and simulation results show that infrared thermal imaging method and the finite element simulation of temperature field can effectively detect the defect in the sample. When combining such two methods together, the information of internal concrete structure can be revealed more comprehensively and accurately.

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