Investigation of Selective Laser Melted 316L Fabricated at High Laser Power
Department: Materials Science and Engineering
Advisor: Wojtek Misiolek
Additive manufacturing of 316L stainless steel powder commonly involves the use of selective laser melting (SLM) to fabricate near-fully dense materials. Fabrication of the powder in newer commercial machines with higher laser powers up to 400 Watts is not fully understood. This project investigates 316L stainless steel parts printed using laser powers ranging from 200 Watts to 400 Watts in an effort to understand how higher laser power affects optimum build parameters and the resulting microstructure. Samples were printed using a newly installed Renishaw AM400 unit. The particle size of 316L stainless steel powder used is roughly 30 µm. The build tray features a total of 75 10 mm x 10 mm x 10 mm solid cube samples, printed with variation in laser power, hatch spacing, and dwell time. Density of each sample was determined by use of the Archimedes method. Metallographic analysis was completed to determine optimum build parameters as well as to characterize the melt pool boundaries (MPBs) and porosity formed from the selective laser melting process. Melt pool boundaries and porosity were characterized using light optical microscopy. This work is supported by the Center for Powder Metallurgy Technology (CPMT) Clayton Family scholarship and the Loewy Institute.
About Michael Pires:
Michael Pires is a senior undergraduate materials science and engineering major at Lehigh University. Pires is from Newark, New Jersey and Belo Horizonte - MG, Brazil. Back home he lives with both parents, older brother, and four dogs. Pires is currently involved in independent research with Dr. Wojtek Misiolek’s Loewy Institute group in the department of materials science and engineering. Pires also works as the Lehigh Men’s Soccer sports manager during the fall season. During his time working with the men’s soccer program, the team won its second ever Patriot League Conference Championship. During the end of that academic year he was named the manager of the year within the athletics department at Lehigh. Pires is tri-lingual, fluent in Portuguese and proficient in Spanish. His hobbies include sports (soccer, volleyball, basketball, and running), hiking, and watching movies.