Selective laser melting under the reactive atmosphere: A convenient and efficient approach to fabricate ultrahigh strength commercially pure titanium without sacrificing ductility

Surface Integrity of Inconel 738LC Parts Manufactured by Selective Laser Melting Followed by High-speed Milling

“…The larger powders were attached with many satellite powders and burrs, while the smaller powders showed relatively smooth surfaces [15]. Size grading D v (10), D v (50) and D v (90) are 18.8 μm, 33.0 μm and 67.2 μm, respectively. The details on the role of the powder size in surface defects and roughness have been reported elsewhere [16].…”

“…Sunshine Laser & Electronics [8] and Sodick [9] independently developed SLM/HSM hybrid machine tools and overcame key technological challenges, such as the adaption of a laser scanning system to avoid structural interferences between SLM and HSM system, the process planning and data processing system to coordinate SLM/HSM. Wang et al [10] investigated the influence of a protective atmosphere on the mechanical properties and microstructures of the commercial pure Ti and conferred superb strength to commercial pure Ti without sacrificing its ductility through SLM by using a highpower laser and incorporating solute atoms from the Ar-N 2 reactive atmosphere. Du et al [11] performed an ASHM experiment on 18Ni-300 steel, and found different microstructures and residual stress evolutions of a hybrid-manufactured part from that of the traditional mechanical manufacturing processes.…”

Intentional Oxidation and Laser Remelting of Highly Reflective Pure Cu for Its High‐Quality Additive Manufacturing

“…Printing parameters for the sample were 200 W and 500 mm/s, whose volumetric energy density was ~148 J/mm 3 . It is known that, for Ti and Ti alloys, an energy density of ~ 85 J/mm 3 can lead to near full destinies [31,32] . The high energy density adopted here for the pure…”

Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy

“…Nevertheless, it is of great importance to verify if the strength-ductility trade-off can be reversed by reactive-atmosphere LPBF in which in situ doping of nitrogen atom is easily feasible. Some studies suggest that intermetallic compounds can be introduced during the LPBF process by in situ reaction with the reactive shielding gas, which leads to the improvement of strength; however, ductility is compromised (Wang et al 2019;Bean et al 2020). In this study, by introducing N 2 to argon (Ar) shielding gas, the CoCrFeMnNi HEA has been successfully fabricated by LPBF with simultaneously improved strength and ductility.…”

“…This promising technique has great potential to break the limitations of traditional processing methods such as machining in terms of making complex components as well as reducing the lead time dramatically. Therefore, LPBF has been employed to fabricate a wide variety of materials, including difficult-to-machine metals, refractory alloy and so on (Wu et al 2018;Cai et al 2019;Wang et al 2019;Cai et al 2020). During the LPBF process, the interaction between the laser beam and metallic powders leads to a transient temperature field with rapid cooling rate up to 10 6°C /s, which has a significant effect on the microstructure and resultant mechanical properties of the final component (Li and Gu 2014).…”