scholarly journals Analytical Study of Powder Stream Geometry in Laser-Based Direct Energy Deposition Process with a Continuous Coaxial Nozzle

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1306
Author(s):  
Qipeng Liu ◽  
Kun Yang ◽  
Yuehua Gao ◽  
Fencheng Liu ◽  
Chunping Huang ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Deposition Process ◽  
Sensitivity Analyses ◽  
Powder Flow ◽  
Forming Process ◽  
Direct Energy Deposition ◽  
Geometric Characteristics ◽  
Direct Energy ◽  
Analytical Formulas ◽  
Geometry Method

In the process of laser-based direct energy deposition, the particle concentration distribution and geometric characteristics of powder flow play an important role in laser–powder interaction and powder utilization, and they affect the forming quality and accuracy. In the current study, based on the geometry information of a powder nozzle and the divergence angles of a powder jet at the nozzle outlet, the geometric profile of a powder stream is analyzed. A set of formulas for calculating the geometric characteristics of the powder stream is derived based on an analytic geometry method. The influence of each parameter on the geometric characteristics of the powder stream is further studied using single-factor and sensitivity analyses. Validation is performed by comparing the results from the presented analytical expressions with those from experiments and/or simulations in published papers. The analytical formulas provided in this paper are simple and practical, providing a theoretical foundation for the control of powder flow and related processes in the forming process.

Multi-physics modeling of direct energy deposition process of thin-walled structures: defect analysis

2021 ◽  
Vol 67 (4) ◽  
pp. 1229-1242
Author(s):  
Shuhao Wang ◽  
Lida Zhu ◽  
Yichao Dun ◽  
Zhichao Yang ◽  
Jerry Ying Hsi Fuh ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Deposition Process ◽  
Defect Analysis ◽  
Direct Energy Deposition ◽  
Thin Walled Structures ◽  
Direct Energy ◽  
Thin Walled ◽  
Physics Modeling

scholarly journals A Study on the Influence of Laser Power on the Microstructure and Mechanical Properties of Functionally Graded Materials Produced by Direct Energy Deposition

2020 ◽  
Vol 58 (11) ◽  
pp. 782-792
Author(s):  
Giseung Shin ◽  
Ji hyun Yoon ◽  
Dae Whan Kim ◽  
Yongho Park ◽  
Jeoung Han Kim
Keyword(s):  
Mechanical Properties ◽  
Laser Power ◽  
Energy Deposition ◽  
Deposition Process ◽  
Functionally Graded ◽  
Direct Energy Deposition ◽  
Microstructure And Mechanical Properties ◽  
Type 316L ◽  
Direct Energy ◽  
Small Change

This study investigated the effects of laser power on the microstructure and mechanical properties of functionally gradient materials (FGM) produced by direct energy deposition. The FGM consisted of five different layers, which were a mixture of austenitic stainless steel (Type 316L) and ferritic steel (HSLA). During the direct energy deposition, two different laser power conditions (450W and 380W) were used. The ratio of Type 316L and HSAL at each deposition layers were 100:0, 65:35, 50:50, 25:75, and 0:100. After the direct energy deposition process, no cracks or delamination were seen between layers of the FGM. The effects of laser power on chemical composition and microstructure were not significant. However, as the laser power decreased, tensile strength and elongation changed with a small change in grain size.

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