In situ measurements and thermo-mechanical simulation of Ti–6Al–4V laser solid forming processes

Lu, Xufei; Lin, Xin; Chiumenti, Michele; Cervera, Miguel; Hu, Yunlong; Ji, Xianglin; Ma, Lifeng; Huang, Weidong

doi:10.1016/j.ijmecsci.2019.01.043

Cited by 78 publications

(34 citation statements)

References 38 publications

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“…(2) [20] Thermal conductivity (N/(s mm 2 °C)) Eq. (3) [20] Emissivity 0.7 [26] 0.7 [27] Convection coefficient (N/(s mm °C)) 0.02 [28] 0.02 [29] Heat transfer coefficient (N/(s mm °C)) 5 [30] Initial workpiece temperature (°C) 930…”

Section: Parameters Workpiece Diesmentioning

confidence: 99%

Numerical Analysis of Friction Conditions on Temperature and Phases Within Forged Ti-6Al-4V Aeroengine Drum

Luo

Jiang

Zhang

et al. 2021

Preprint

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Friction conditions significantly impact the temperature and phases of titanium forged parts, further directly affecting the microstructures and mechanical properties of final parts. In this paper, a 2D simplified FE model combined with phase transition equations is developed to simulate Ti-6Al-4V drum forging procedure. Then, friction effects on the temperature and phases of the forged drum are numerically analyzed and verified by experiments. Results indicate that unlike little influence on α+β phase, improving friction obviously decreases the general levels of temperature and β phase and increases the homogeneities of α and β phases within the forged drum, which are associated with cooling rates and the heating effects of friction and deformation.

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Section: Parameters Workpiece Diesmentioning

confidence: 99%

Numerical Analysis of Friction Conditions on Temperature and Phases Within Forged Ti-6Al-4V Aeroengine Drum

Luo

Jiang

Zhang

et al. 2021

Preprint

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“…When the temperature of the material point falls lower than T anneal , the material can harden again. For instance, several authors [25,31,[53][54][55] exploited this approach in order to compute the stress field and perform a sensitivity analysis to this annealing temperature value. However, the sensitivity of the predicted displacement field was lower than that of the stress and it seemed not a key feature in the current validation.…”

Section: Thermophysical Propertiesmentioning

confidence: 99%

Sensitivity Analysis in the Modelling of a High Speed Steel Thin-Wall Produced by Directed Energy Deposition

Jardin

Tuninetti

Tchuindjang

et al. 2020

Metals

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This paper reports the sensitivity of the thermal and the displacement histories predicted by a finite element analysis to material properties and boundary conditions of a directed-energy deposition of a M4 high speed steel thin-wall part additively manufactured on a 42CrMo4 steel substrate. The model accuracy was assessed by comparing the simulation results with the experimental measurements such as evolving local temperatures and distortion of the substrate. The numerical results of thermal history were successfully correlated with the solidified microstructures measured by scanning electron microscope technique, explaining the non-uniform, cellular-type grains depending on the deposit layers. Laser power, thermal conductivity, and thermal capacity of deposit and substrate were considered in the sensitivity analysis in order to quantify the effect of their variations on the local thermal history, while Young’s modulus and yield stress variation effects were evaluated on the distortion response of the sample. The laser power showed the highest impact on the thermal history, then came the thermal capacity, then the conductivity. Considering distortion, variations of the Young’s modulus had a higher impact than the yield stress.

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“…The temperature gradient between layers produces residual stresses and plastic deformations because the material cannot freely expand and contract. As a result, the accumulated 2 of 16 stresses generate warpage and, eventually, cracking in thin-walled structures, compromising both the geometrical accuracy and the structural integrity of the AM component [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Warpage Analysis and Control of Thin-Walled Structures Manufactured by Laser Powder Bed Fusion

Chiumenti

Cervera

et al. 2021

Metals

Self Cite

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Thin-walled structures are of great interest because of their use as lightweight components in aeronautical and aerospace engineering. The fabrication of these components by additive manufacturing (AM) often produces undesired warpage because of the thermal stresses induced by the manufacturing process and the components’ reduced structural stiffness. The objective of this study is to analyze the distortion of several thin-walled components fabricated by Laser Powder Bed Fusion (LPBF). Experiments are performed to investigate the sensitivity of the warpage of thin-walled structures fabricated by LPBF to different design parameters such as the wall thickness and the component height in several open and closed shapes. A 3D-scanner is used to measure the residual distortions in terms of the out-of-plane displacement. Moreover, an in-house finite element software is firstly calibrated and then used to enhance the original design in order to minimize the warpage induced by the LPBF printing process. The outcome of this shows that open geometries are more prone to warping than closed ones, as well as how vertical stiffeners can mitigate component warpage by increasing stiffness.

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In situ measurements and thermo-mechanical simulation of Ti–6Al–4V laser solid forming processes

Cited by 78 publications

References 38 publications

Numerical Analysis of Friction Conditions on Temperature and Phases Within Forged Ti-6Al-4V Aeroengine Drum

Numerical Analysis of Friction Conditions on Temperature and Phases Within Forged Ti-6Al-4V Aeroengine Drum

Sensitivity Analysis in the Modelling of a High Speed Steel Thin-Wall Produced by Directed Energy Deposition

Warpage Analysis and Control of Thin-Walled Structures Manufactured by Laser Powder Bed Fusion

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