Realtime Measurement of Temperature Field during Direct Laser Deposition Shaping

Direct laser deposition shaping is a state-of-the-art rapid prototyping technology. It can directly fabricate metal parts layer-by-layer without any die, mold, fixture and intermediate, just driven by the laminated CAD model. Accordingly, how to improve the quality of as-formed parts becomes an urgent issue in this research field. It is well known that as for the hot working, the heat history can generate enormous influence on the microstructure and mechanical properties of the parts. Due to the large quantity of heat introduced by laser fabrication process, it is necessary to build a temperature measuring platform to realtime monitor and control the temperature field in the laser fabrication process. As a result, such platform was created to communicate with computer by the temperature data collecting module and interface standard converting module, and achieved the temperature acquisition in the serial communication process through the Microsoft programming software. The experimental result proves the validity of the platform, which can provide effective boundary condition and experimental verification for the numerical simulation. In addition, the desirable temperature distribution can be obtained through the realtime process monitoring and effective parameter adjusting.

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Building Multi-Material components by Direct Laser Deposition

MATEC Web of Conferences ◽

10.1051/matecconf/201929901006 ◽

2019 ◽

Vol 299 ◽

pp. 01006

Author(s):

Matteo Perini ◽

Sasan Amirabdollahian ◽

Paolo Bosetti

Keyword(s):

Metal Powder ◽

Food Environment ◽

High Performance ◽

Real Life ◽

Laser Deposition ◽

Layer By Layer ◽

Metallic Materials ◽

Direct Laser Deposition ◽

Direct Laser ◽

Single Material

Most mechanical components are usually made of a single material, as a compromise between chemical, physical and functional properties. When designing an object, the choice of one material over another is driven by many reasons. Sometimes these reasons are not strictly technical, including for instance: biocompatibility, density, weldability, corrosion resistance, price, and appearance. Direct Laser Deposition (DLD) technology is an additive manufacturing process that allows the construction of objects by depositing material layer by layer. With DLD, the metal powder comes out of a nozzle conveyed by a flow of inert gas and is melted by a laser beam. One of the advantages of this technology over other AM technologies (such as SLM) is that it is possible to vary the composition of the deposited material by simply changing the metal powder. It is clear that with DLD technology, the properties of different metallic materials deposited together in a single object can be exploited. With this work the authors present two real-life case studies, in which the DLD technology is used to build multi-material components. Thefirst case concerns a gearbox component made of C40 steel that must work in a food environment and has therefore been completely covered with a layer of stainless steel. The second case is a flange that must have a weldable base, while the internal hole must be made of a high-performance tool-steel.

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Real-time spectrographic analysis of the melt pool during direct laser deposition process

10.2351/1.5061265 ◽

2008 ◽

Author(s):

Konrad Bartkowiak

Keyword(s):

Real Time ◽

Deposition Process ◽

Laser Deposition ◽

Spectrographic Analysis ◽

Direct Laser Deposition ◽

Melt Pool ◽

Direct Laser

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Microstructure and properties of Ni-Co-Mn-Al magnetic shape memory alloy prepared by direct laser deposition and heat treatment

Optics & Laser Technology ◽

10.1016/j.optlastec.2021.107119 ◽

2021 ◽

Vol 141 ◽

pp. 107119

Author(s):

Wuming Jia ◽

Suiyuan Chen ◽

Luting Wang ◽

Fanmin Shang ◽

Xinru Sun ◽

...

Keyword(s):

Heat Treatment ◽

Shape Memory Alloy ◽

Shape Memory ◽

Laser Deposition ◽

Magnetic Shape Memory ◽

Direct Laser Deposition ◽

Microstructure And Properties ◽

Magnetic Shape Memory Alloy ◽

Direct Laser

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A high strength low alloy steel fabricated by direct laser deposition

Vacuum ◽

10.1016/j.vacuum.2018.12.030 ◽

2019 ◽

Vol 161 ◽

pp. 225-231 ◽

Cited By ~ 15

Author(s):

Qiang Wang ◽

Song Zhang ◽

Chunhua Zhang ◽

Jianqiang Wang ◽

M. Babar Shahzad ◽

...

Keyword(s):

Alloy Steel ◽

High Strength ◽

Laser Deposition ◽

Low Alloy Steel ◽

Direct Laser Deposition ◽

Direct Laser

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Effect of laser incident energy on microstructures and mechanical properties of 12CrNi2Y alloy steel by direct laser deposition

Journal of Material Science and Technology ◽

10.1016/j.jmst.2018.10.024 ◽

2019 ◽

Vol 35 (2) ◽

pp. 395-402 ◽

Cited By ~ 20

Author(s):

Tingting Guan ◽

Suiyuan Chen ◽

Xueting Chen ◽

Jing Liang ◽

Changsheng Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Alloy Steel ◽

Incident Energy ◽

Laser Deposition ◽

Direct Laser Deposition ◽

Direct Laser ◽

Microstructures And Mechanical Properties

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Self-Sufficient Modeling of Single Track Deposition of Ti–6Al–4V With the Prediction of Capture Efficiency

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4041423 ◽

2018 ◽

Vol 141 (1) ◽

Cited By ~ 14

Author(s):

Christopher Katinas ◽

Shunyu Liu ◽

Yung C. Shin

Keyword(s):

Molten Pool ◽

Deposition Process ◽

Capture Efficiency ◽

Laser Deposition ◽

Single Track ◽

Profile Error ◽

Track Geometry ◽

Direct Laser Deposition ◽

Direct Laser ◽

Traditional Manufacturing

Understanding the capture efficiency of powder during direct laser deposition (DLD) is critical when determining the overall manufacturing costs of additive manufacturing (AM) for comparison to traditional manufacturing methods. By developing a tool to predict the capture efficiency of a particular deposition process, parameter optimization can be achieved without the need to perform a costly and extensive experimental study. The focus of this work is to model the deposition process and acquire the final track geometry and temperature field of a single track deposition of Ti–6Al–4V powder on a Ti–6Al–4V substrate for a four-nozzle powder delivery system during direct laser deposition with a LENS™ system without the need for capture efficiency assumptions by using physical powder flow and laser irradiation profiles to predict capture efficiency. The model was able to predict the track height and width within 2 μm and 31 μm, respectively, or 3.3% error from experimentation. A maximum of 36 μm profile error was observed in the molten pool, and corresponds to errors of 11% and 4% in molten pool depth and width, respectively. Based on experimentation, the capture efficiency of a single track deposition of Ti–6Al–4V was found to be 12.0%, while that from simulation was calculated to be 11.7%, a 2.5% deviation.

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Determining the Optimal Mode of the Inconel 718 Alloy Deposition at a Direct Laser Deposition Plant

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1037.3 ◽

2021 ◽

Vol 1037 ◽

pp. 3-12

Author(s):

Maxim Oleynik ◽

Alexander I. Khaimovich ◽

Andrey V. Balaykin

Keyword(s):

Tensile Strength ◽

Energy Density ◽

Target Function ◽

Laser Deposition ◽

Steep Ascent ◽

Inconel 718 Alloy ◽

Direct Laser Deposition ◽

Direct Laser ◽

Optimal Mode ◽

Deposition Mode

The paper describes determining the optimal direct laser deposition mode when processing the results of a two-factor experiment by the steep ascent method. The dependence of the ultimate tensile strength on the volumetric energy density and the lateral pitch was chosen as the target function.

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