About this Abstract |
Meeting |
Materials Science & Technology 2020
|
Symposium
|
Additive Manufacturing: Materials, Alloy Development, Microstructure and Properties
|
Presentation Title |
Understanding The Influence of Porosity and Microstructure On
Mechanical Behavior in Additive Manufactured 316L Stainless Steel Using In-situ X-ray Computed Tomography and Electron Microscopy |
Author(s) |
Aeriel D. Murphy-Leonard, David Rowenhorst, Richard Fonda |
On-Site Speaker (Planned) |
Aeriel D. Murphy-Leonard |
Abstract Scope |
Three-dimensional techniques such as x-ray micro-computed tomography (XCT) enable the ability to fully visualize and quantify
porosity and provide fundamental relationships between pore size and morphology on mechanical behavior and damage evolution. In the current study, the influence of pore and void size, morphology, and distribution on crack initiation, growth, and coalescence during tensile and cyclic loading was examined using a lab based XCT system and in-situ synchrotron XCT. The material examined was
additively manufactured (AM) 316L stainless steel. The specimens were produced using laser powder bed fusion techniques where the gauge diameter was 1 mm. Static XCT revealed that in conditions where the cross-sectional area is small majority of the porosity was in-homogeneously distributed where a higher distribution of porosity was found near the surface which is commonly seen in additively manufactured materials. It was also determined that cracks initiated at near surface defects in the specimen during fatigue. |