scholarly journals Modeling of solidification microstructure evolution in laser powder bed fusion fabricated 316L stainless steel using combined computational fluid dynamics and cellular automata

2019 ◽  
Vol 28 ◽  
pp. 750-765 ◽  
Author(s):  
Yi Zhang ◽  
Jing Zhang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Stainless Steel ◽  
Cellular Automata ◽  
Microstructure Evolution ◽  
316L Stainless Steel ◽  
Solidification Microstructure ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Selective Corrosion and Solidification Microstructure of Laser Powder Bed Fusion 316L Stainless Steel

2020 ◽  
Vol MA2020-02 (10) ◽  
pp. 1203-1203
Author(s):  
Duane Armell Macatangay ◽  
Jenna Conrades ◽  
Keegan Brunner ◽  
Robert Kelly
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Solidification Microstructure ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Selective Corrosion

scholarly journals Effect of laser power on defect, texture, and microstructure of a laser powder bed fusion processed 316L stainless steel

2019 ◽  
Vol 164 ◽  
pp. 107534 ◽  
Author(s):  
Hahn Choo ◽  
Kin-Ling Sham ◽  
John Bohling ◽  
Austin Ngo ◽  
Xianghui Xiao ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Laser Power ◽  
316L Stainless Steel ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Stability of cellular microstructure in laser powder bed fusion of 316L stainless steel

2019 ◽  
Vol 739 ◽  
pp. 109-117 ◽  
Author(s):  
Umberto Scipioni Bertoli ◽  
Benjamin E. MacDonald ◽  
Julie M. Schoenung
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Cellular Microstructure

scholarly journals Keyhole Formation by Laser Drilling in Laser Powder Bed Fusion of Ti6Al4V Biomedical Alloy: Mesoscopic Computational Fluid Dynamics Simulation versus Mathematical Modelling Using Empirical Validation

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3284
Author(s):  
Asif Ur Rehman ◽  
Muhammad Arif Mahmood ◽  
Fatih Pitir ◽  
Metin Uymaz Salamci ◽  
Andrei C. Popescu ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Density ◽  
Operating Conditions ◽  
Dynamics Simulation ◽  
Powder Layer ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Melt Pool

In the laser powder bed fusion (LPBF) process, the operating conditions are essential in determining laser-induced keyhole regimes based on the thermal distribution. These regimes, classified into shallow and deep keyholes, control the probability and defects formation intensity in the LPBF process. To study and control the keyhole in the LPBF process, mathematical and computational fluid dynamics (CFD) models are presented. For CFD, the volume of fluid method with the discrete element modeling technique was used, while a mathematical model was developed by including the laser beam absorption by the powder bed voids and surface. The dynamic melt pool behavior is explored in detail. Quantitative comparisons are made among experimental, CFD simulation and analytical computing results leading to a good correspondence. In LPBF, the temperature around the laser irradiation zone rises rapidly compared to the surroundings in the powder layer due to the high thermal resistance and the air between the powder particles, resulting in a slow travel of laser transverse heat waves. In LPBF, the keyhole can be classified into shallow and deep keyhole mode, controlled by the energy density. Increasing the energy density, the shallow keyhole mode transforms into the deep keyhole mode. The energy density in a deep keyhole is higher due to the multiple reflections and concentrations of secondary reflected beams within the keyhole, causing the material to vaporize quickly. Due to an elevated temperature distribution in deep keyhole mode, the probability of pores forming is much higher than in a shallow keyhole as the liquid material is close to the vaporization temperature. When the temperature increases rapidly, the material density drops quickly, thus, raising the fluid volume due to the specific heat and fusion latent heat. In return, this lowers the surface tension and affects the melt pool uniformity.

scholarly journals Laser ultrasonic testing for near-surface defects inspection of 316L stainless steel fabricated by laser powder bed fusion

China Foundry ◽  
2021 ◽  
Vol 18 (4) ◽  
pp. 360-368
Author(s):  
Ting Dai ◽  
Xiao-jian Jia ◽  
Jun Zhang ◽  
Jin-feng Wu ◽  
Yi-wei Sun ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ultrasonic Testing ◽  
316L Stainless Steel ◽  
Surface Defects ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Laser Ultrasonic ◽  
Near Surface ◽  
Powder Bed ◽  
Defects Inspection
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