Study on selective laser melting of commercially pure titanium powder

Abstract

Laser additive manufacturing processes melt the powder particles using laser beam energy to form solid three-dimensional objects. This article mainly focuses on numerical analysis and experimentation of laser melting of commercially pure titanium powder. Numerical solutions to moving heat source problems were developed, and their influences on process parameters were validated. The energy density has a significant role in laser melting process. The numerical investigation demonstrates the significant effect of laser energy density on laser tracks. The laser power, distribution of powder particles, the absorptivity, density, and chemical constitution of powder materials are the main factors which influence the laser energy penetration. The absorptivity plays a vital role in consolidation phenomena of the powder layer which helps to get a denser part or layer. The experimental result clearly indicates that at lower laser speed the powder compaction is better. Temperature distribution, depth, and width of laser track were compared in this article. By investigating the observations from optical microscopic images and scanning electron microscopic images, the surface characteristics of laser-melted tracks were studied. The study on numerical and experimental results shows that the optimum condition for better laser track is laser power 45 W, laser speed 20 mm/s, and laser diameter 2.5 mm. This study provides important insights into laser parameters in the melting of commercially pure titanium powder.

Study on the forming precision optimization of built-in flow channel structure manufactured by selective laser melting

“…Similarly, the surface quality of each part can be improved effectively by optimizing the process parameters. 29 However, it is time-consuming and expensive to take all the different parameters of parts into consideration through experiments. Obvious, it is obvious that numerical method is a convenient and affordable means to study the residual stress distribution and deformation caused by different shape parameters.…”

Influence of ultrasonic vibrations on the properties of press-and-sintered titanium

“…Titanium and its alloys are widely used in different industries due to their high specific strength, high corrosion resistance, and biocompatibility. 1,2 However, the high cost of titanium restricts its application on high added value parts. 3 This limitation causes to use of near-net-shape manufacturing processes such as powder metallurgy for their component fabrication.…”

On the suitability of induction heating system for metal additive manufacturing

“…Over time, different AM processes have been developed for polymer components. In the last decade, various metal AM processes have also been developed such as direct metal laser sintering (DMLS), 20 electron beam melting (EBM), 21,22 selective laser sintering (SLS), 23 selective laser melting (SLM), 24 laser engineered net shaping (LENS), 25 direct metal deposition (DMD), 26 directed light fabrication (DLF), 27 wire and arc additive manufacturing (WAAM), 28 and powder bed and inkjet 3D printing (3DP). 29 These AM technology processes the metal powder or wire as an input to fabricate the metallic parts.…”