| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
| Presentation Title |
Parameter Optimization and Flaw Type Dependent Tensile Properties of 15-5PH Stainless Steel Manufactured by Laser Powder Bed Fusion |
| Author(s) |
Nicolas Ayers, Cameron Lucas, Asif Mahmud, Andrew Ostrowski, Nemanja Kljestan, Marco Knezevic, Yongho Sohn |
| On-Site Speaker (Planned) |
Nicolas Ayers |
| Abstract Scope |
Laser powder bed fusion (LPBF) of martensitic 15-5PH stainless steel was studied to determine optimal printing window and the mechanical behavior dependency on flaw type. Two types of flaws were studied, circular keyhole (KH) flaws, and irregular lack of fusion (LOF) flaws. Laser scan speed and laser power were systematically varied to identify the optimal processing parameters (i.e., highest density). Results show multiple build parameters achieve sample density above 99.95%. Samples with induced flaws were tested under uniaxial tensile loading to correlate flaw type with mechanical properties at varying levels of density. At one such density level (97%), samples with LOF flaws had a 14% decrease in yield strength and a 51% decrease in elongation compared to samples with KH flaws. An understanding of mechanical property dependency on flaw type, and processing parameter effects on flaw type, is important to guide the design and manufacturing of reliable LPBF components. |