Numerical Simulation of Temperature Field of Direct Laser Metal Deposition Shaping Process of Titanium Alloys

2011 ◽  
Vol 295-297 ◽  
pp. 2112-2119
Author(s):  
Yuan Kong ◽  
Wei Jun Liu ◽  
Yue Chao Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Molten Pool ◽  
Three Dimensional ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Forming Process ◽  
Direct Laser

In order to control the thermal stress of forming process, based on “element birth and death” technology of finite element method, a numerical simulation of three-dimensional temperature field and stress field during multi-track & multi-layer laser metal deposition shaping(LMDS) process is developed with ANSYS parametric design language (APDL). The dynamic variances of temperature field and stress field of forming process are calculated with the energy compensation of interaction between molten pool-powder and laser-powder. The temperature field, temperature gradient, thermal stress field and distribution of residual stress are obtained. The results indicate that although the nodes on different layers are activated at different time, their temperature variations are similar. The temperature gradients of samples are larger near the molten pool area and mainly along z-direction. Finally, it’s verified that the analysis results are consistent with actual situation by the experiments with same process parameters.

Numerical Simulation Temperature Field of Laser Cladding Titanium Alloy

2011 ◽  
Vol 117-119 ◽  
pp. 1633-1637
Author(s):  
Guang Yang ◽  
Wei Wang ◽  
Lan Yun Qin ◽  
Xing Lang Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Molten Pool ◽  
Forming Process ◽  
Thermal Stress Field ◽  
Field Temperature ◽  
Energy Compensation ◽  
Pool Area

Abstract: In order to control the thermal stress of cladding, a numerical simulation of temperature field during multi-track & multi-layer laser metal deposition (LMD) process is developed with ABAQUS based on “element birth and death” technology of FEM. The dynamic variances of temperature field and stress field of forming process are calculated with the energy compensation of interaction between molten pool-powder. The temperature field, temperature gradient, thermal stress field and distribution of residual stress are obtained. The results indicate that although the nodes on different layers are activated at different time, their temperature variations are similar. The temperature gradients of samples are larger near the molten pool area and mainly along z-direction.

Modeling of Temperature Field Evolution During Multilayered Direct Laser Metal Deposition

2017 ◽  
Vol 26 (5) ◽  
pp. 831-845 ◽  
Author(s):  
DongYun Zhang ◽  
Zhe Feng ◽  
ChengJie Wang ◽  
Zhen Liu ◽  
DongDong Dong ◽  
...  
Keyword(s):  
Temperature Field ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Field Evolution ◽  
Direct Laser ◽  
Direct Laser Metal Deposition

Molten Pool Tracking Using a Superpixel-Based Approach in a Laser Metal Deposition Process

2021 ◽  
Vol 143 (10) ◽  
Author(s):  
Angel-Iván García-Moreno ◽  
Juan-Manuel Alvarado-Orozco ◽  
Juansethi Ibarra-Medina ◽  
Enrique Martínez-Franco
Keyword(s):  
Molten Pool ◽  
Infrared Camera ◽  
Ground Truth ◽  
Deposition Process ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Detector Resolution ◽  
Direct Laser ◽  
Color Similarity ◽  
Manufacturing Technologies

Abstract Nowadays, additive manufacturing technologies (AM) suffer from insufficient or lacking methodologies/techniques for quality control. This fact represents a key technological barrier preventing broader industrial adoption of AM, particularly in high-value applications where component failure cannot be accepted. This article presents a real-time melt pool segmentation and monitoring technique applicable to the direct laser metal deposition (LMD) process. An infrared camera with an InSb detector (resolution of 640 × 480, spectral range between 3 and 5 μm) was used. An algorithm, called gravitational superpixels, is presented. This algorithm can group pixels and generate superpixels based on a block generation technique that compares color similarity and temperature in infrared images. Besides, a color similarity correction is applied to reduce uncertainty in segmentation, as well as for eliminating the image background. The task of extracting edges is based on the law of universal gravitation. A quantitative and qualitative algorithm performance analysis, which uses standard metrics, is presented. The analysis demonstrates better versatility than reduction/feature extraction or image segmentation approaches by high-/low-pass filtering. The experimental validation was carried out, extracting and measuring the molten pool geometry and its thermal signature. Then, measures were compared against ground truth and against results obtained by other similar methods. The proposed gravitational superpixel method has higher precision and performance. Our proposal has a significant potential for monitoring industrial AM processes since it requires minimal modifications of commercially available industrial machines.

Temperature Field Numerical Simulation of Screwy Thin-Walled Part Cladded by Hollow Laser Beam

2013 ◽  
Vol 779-780 ◽  
pp. 410-413
Author(s):  
Hao Lin ◽  
Shi Hong Shi
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Laser Beam ◽  
Laser Cladding ◽  
Molten Pool ◽  
Laser Power ◽  
Forming Process ◽  
Single Laser ◽  
Thin Walled ◽  
Hollow Laser Beam

A numerical simulation model of laser cladding based on internal powder feeding through a hollow laser beam is set up by the Ansys Parametric Design Language (APDL). Through analyzing this model, the saddle-shaped distribution of energy absorbed in scanning direction is found and the molten pool temperature field of single laser cladding is observed like a comet[. Base on the single laser cladding experiments, the initial parameters and test plans of laser cladding and the screwy thin-walled part forming are confirmed. The finite element model of laser cladding forming screwy thin-walled part is established. The evolution of temperature field and thermal cycle of the nodes are studied during the screwy thin-walled part forming process. In the emulation laser power is controlled real time according to the analyses above, and the changing value of laser power is obtained to keep the molten pool temperature steady. The screwy thin-walled part is formed successfully based on these data.

Cooling Effects of H-Beam after Rolling on Thermal Stress

2014 ◽  
Vol 898 ◽  
pp. 233-236
Author(s):  
Jin Hong Ma ◽  
Xiao Han Yao ◽  
Bin Tao ◽  
Shuo Li
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Controlled Cooling ◽  
Fem Model ◽  
Transient Temperature Field ◽  
Cooling Effects ◽  
H Beam

Controlled cooling of H-beam after rolling, can change the microstructure consituent,improve the strength and improve the general mechanical property and service performance. According to actual product, the rational thermal boundary condition adopted, three dimensional FEM model is established. Spray cooling is used. Transient temperature field and stress field is simulated by the FEM software ANSYS/Multiphysics when H-beam is cooled. The four kinds of cooling scheme are designed. Through analysis of the relation of temperature field with stress field, the main reason of producing residual thermal stress is the section temperature difference in the cooling process of H-beam after rolling.

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