A pure titanium (Ti) plate was fabricated by selective laser melting (SLM) in a vacuum. Ti is attractive materials for medical, aerospace, and automotive applications, because they have properties of biocompatibility, high corrosion and erosion resistance, and mechanical resistance, but forming complicated structures is challenging due to difficulties working the material. Although some studies have reported to form pores in SLMed samples due to spattering generated by laser irradiation, and there are few reports that investigate the details of the correlation between spatter and pores. Spatter results in an insufficient input energy to the powder bed because the laser is absorbed by the spatter particles. Consequently, technology to suppress the amount of spatter for SLM processes is needed. In this study, the quantitatively evaluation method for the amount of spatter was developed with high speed video camera while the SLM processes.
316L stainless steel plate was fabricated by spatter free selective laser melting (SLM). 316L stainless steel has excellent properties such as corrosion resistance and hardness. But it is difficult to form into complicated structures because of hard to work material. SLM can fabricate complicated shapes because it builds a 3D material layer-by-layer from a powder. Some issues, however, have yet to be resolved, including dimensional accuracy, surface finishes, processing time, and mechanical properties such as surface roughness and hardness. There is some problems that spatter is generated by metal powder scattering on when the laser is irradiated to the powder. Due to the spatter, the input energy to the powder bed becomes insufficient because the laser is absorbed the spatter particle. Therefore it is required the technology to suppress the amount of spatter for SLM process. In this study, in order to clarify the mechanism of the spatter free process, the 316L stainless steel was fabricated by SLM and observed the behavior of powder during the laser irradiation by high speed video camera. As the results, it was revealed that the amount of spatter was depended on the input energy of laser. At the laser fluence of 20 kJ/cm2 , the amount of spatter was minimized, and surface roughness on the fabricated sample was improved to 3.5 μm from 30μm.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.