ASM Pittsburgh Chapter Awards and Past Chair’s Night
Thursday, May 15, 2025
Shiloh Gastro, 123 Shiloh Street, Pittsburgh, PA 15211
Check In and Social: 6:00 -7:00
Dinner: 7:00 (Buffet of Salmon and Pasta Primavera)
Presentation: After Dinner
ASM Members/spouses: $35.00
Non-ASM Members/spouses: $40.00
Retirees/spouses: $25.00
Material Advantage Member: $25.00
Please RSVP by May 11 to joemuha188@gmail.com or
asmpittsburghchapter@asminternational.org
The presentation will be by the chapter’s 2025 Bain awardee.
Title: Controlling Oxides in Laser-Based Added Manufacturing
Abstract: Oxidation is inevitable during laser-based additive manufacturing, because the oxygen activity in the build environment is higher than at equilibrium with the metal – whether it is an aluminum alloy or a nickel-based superalloy, the examples considered here. The resulting oxide inclusions can be several tens of microns long. However, it is possible to control the extent to which the built part is enriched in oxides. Kinetic control involves decreasing the rate of oxygen transfer by lowering the oxygen concentration in the build atmosphere; limiting spatter formation likely helps too. Mechanical control appears to rely on removal of oxides from the build surface. Examples of parts built under different conditions illustrate that oxide control is possible.
Petrus Christiaan (Chris) Pistorius is POSCO Professor and Co-Director of the Center for Iron and Steelmaking Research in the Department of Materials Science and Engineering at Carnegie Mellon University. His research focuses on pyrometallurgy and solidification. Previously he was an associate professor (1991-1996) and professor (1997-2008) in the Department of Materials Science and Metallurgical Engineering, University of Pretoria, South Africa, and served as the head of that department from May 2002 to June 2008. Chris has a Master's degree in Metallurgical Engineering from the University of Pretoria, and a PhD from the University of Cambridge, United Kingdom.