scholarly journals Numerical Simulation for Heat and Mass Transfer During Selective Laser Melting of Titanium alloys Powder

2016 ◽  
Vol 83 ◽  
pp. 1444-1449 ◽  
Author(s):  
Cheng-Jui Li ◽  
Tsung-Wen Tsai ◽  
Chien-Chou Tseng
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Titanium Alloys ◽  
Heat And Mass Transfer ◽  
Selective Laser Melting ◽  
Laser Melting

On the role of heat and mass transfer into laser processability during selective laser melting AlSi12 alloy based on a randomly packed powder-bed

2018 ◽  
Vol 32 (10) ◽  
pp. 1850105 ◽  
Author(s):  
Lianfeng Wang ◽  
Biao Yan ◽  
Lijie Guo ◽  
Dongdong Gu
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Selective Laser Melting ◽  
Laser Power ◽  
Variable Temperature ◽  
Laser Melting ◽  
Powder Bed ◽  
Experimental Surface ◽  
Temperature Dependent Properties ◽  
Packed Powder

A newly transient mesoscopic model with a randomly packed powder-bed has been proposed to investigate the heat and mass transfer and laser process quality between neighboring tracks during selective laser melting (SLM) AlSi12 alloy by finite volume method (FVM), considering the solid/liquid phase transition, variable temperature-dependent properties and interfacial force. The results apparently revealed that both the operating temperature and resultant cooling rate were obviously elevated by increasing the laser power. Accordingly, the resultant viscosity of liquid significantly reduced under a large laser power and was characterized with a large velocity, which was prone to result in a more intensive convection within pool. In this case, the sufficient heat and mass transfer occurred at the interface between the previously fabricated tracks and currently building track, revealing a strongly sufficient spreading between the neighboring tracks and a resultant high-quality surface without obvious porosity. By contrast, the surface quality of SLM-processed components with a relatively low laser power notably weakened due to the limited and insufficient heat and mass transfer at the interface of neighboring tracks. Furthermore, the experimental surface morphologies of the top surface were correspondingly acquired and were in full accordance to the calculated results via simulation.

Properties of Ti-6Al-4V titanium alloys obtained by selective laser melting

2019 ◽  
pp. 46-57
Author(s):  
M.A. Kaplan ◽  
◽  
М.A. Smirnov ◽  
A.A. Kirsankin ◽  
M.A. Sevostyanov ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Selective Laser Melting ◽  
Laser Melting

Numerical simulation of heat and mass transfer during sublimation drying of porcine aorta

2021 ◽  
pp. 1-14
Author(s):  
Chao Gui ◽  
Leren Tao ◽  
Weifang Yang ◽  
Yaqi Zhang ◽  
Shanshan Chen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Heat And Mass Transfer

scholarly journals Numerical simulation of heat and mass transfer during the absorption of hydrogen in a magnesium hydride

2006 ◽  
Vol 47 (20) ◽  
pp. 3632-3643 ◽  
Author(s):  
Philippe Marty ◽  
J.-F. Fourmigue ◽  
P. De Rango ◽  
D. Fruchart ◽  
J. Charbonnier
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Magnesium Hydride ◽  
Absorption Of Hydrogen

Martensite decomposition during post-heat treatments and the aging response of near-α Ti–6Al–2Sn–4Zr–2Mo (Ti-6242) titanium alloy processed by selective laser melting (SLM)

2021 ◽  
pp. 2050018
Author(s):  
Haiyang Fan ◽  
Yahui Liu ◽  
Shoufeng Yang
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Titanium Alloys ◽  
Selective Laser Melting ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Aging Treatment ◽  
Water Quenching ◽  
Laser Melting ◽  
Aging Response

Ti–6Al–2Sn–4Zr–2Mo (Ti-6242), a near-[Formula: see text] titanium alloy explicitly designed for high-temperature applications, consists of a martensitic structure after selective laser melting (SLM). However, martensite is thermally unstable and thus adverse to the long-term service at high temperatures. Hence, understanding martensite decomposition is a high priority for seeking post-heat treatment for SLMed Ti-6242. Besides, compared to the room-temperature titanium alloys like Ti–6Al–4V, aging treatment is indispensable to high-temperature near-[Formula: see text] titanium alloys so that their microstructures and mechanical properties are pre-stabilized before working at elevated temperatures. Therefore, the aging response of the material is another concern of this study. To elaborate the two concerns, SLMed Ti-6242 was first isothermally annealed at 650[Formula: see text]C and then water-quenched to room temperature, followed by standard aging at 595[Formula: see text]C. The microstructure analysis revealed a temperature-dependent martensite decomposition, which proceeded sluggishly at [Formula: see text]C despite a long duration but rapidly transformed into lamellar [Formula: see text] above the martensite transition zone (770[Formula: see text]C). As heating to [Formula: see text]C), it produced a coarse microstructure containing new martensites formed in water quenching. The subsequent mechanical testing indicated that SLM-built Ti-6242 is excellent in terms of both room- and high-temperature tensile properties, with around 1400 MPa (UTS)[Formula: see text]5% elongation and 1150 MPa (UTS)[Formula: see text]10% elongation, respectively. However, the combination of water quenching and aging embrittled the as-built material severely.

Sign in / Sign up

Export Citation Format

Share Document