Revealing the effects of laser beam shaping on melt pool behaviour in conduction-mode laser melting

被引:24
作者
Ebrahimi, Amin [1 ]
Sattari, Mohammad [2 ]
Babu, Aravind [1 ]
Sood, Arjun [1 ]
Romer, Gert-Willem R. B. E. [2 ]
Hermans, Marcel J. M. [1 ]
机构
[1] Delft Univ Technol, Fac Mech Maritime & Mat Engn, Dept Mat Sci & Engn, Mekelweg 2, NL-2628CD Delft, Netherlands
[2] Univ Twente, Fac Engn Technol, Chair Laser Proc, Dept Mech Solids Surfaces & Syst MS3, Drienerlolaan 5, NL-7522NB Enschede, Netherlands
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2023年 / 27卷
关键词
Fusion welding and additive manufacturing; Laser beam shaping; Melt pool behaviour; Microstructural grain morphology; Bead profile; High-fidelity numerical simulation; MICROSTRUCTURAL CONTROL; SOLIDIFICATION; COLUMNAR; ENERGY; ANGLE;
D O I
10.1016/j.jmrt.2023.11.046
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Laser beam shaping offers remarkable possibilities to control and optimise process stability and tailor material properties and structure in laser-based welding and additive manufacturing. However, little is known about the influence of laser beam shaping on the complex melt-pool behaviour, solidified melt-track bead profile and microstructural grain morphology in laser material processing. A simulation-based approach is utilised in the present work to study the effects of laser beam intensity profile and angle of incidence on the melt-pool behaviour in conduction-mode laser melting of stainless steel 316L plates. The present high-fidelity physics-based computational model accounts for crucial physical phenomena in laser material processing such as complex laser-matter interaction, solidification and melting, heat and fluid flow dynamics, and free-surface oscillations. Experiments were carried out using different laser beam shapes and the validity of the numerical predictions is demonstrated. The results indicate that for identical processing parameters, reshaping the laser beam leads to notable changes in the thermal and fluid flow fields in the melt pool, affecting the melt-track bead profile and solidification microstructure. The columnar-to-equiaxed transition is discussed for different laser-intensity profiles.
引用
收藏
页码:3955 / 3967
页数:13
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