Microstructural Characterization and High Strain Rate Behavior of Solid State Additive Manufactured Inconel 625

Wednesday, April 12, 2017: 1:00 PM
Room 9 (Charleston Area Convention Center)
Mr. Oscar Rivera , University of Alabama, Tuscaloosa, AL
Dr. Paul Allison , University of Alabama, Tuscaloosa, AL
Dr. Luke Brewer , University of Alabama, Tuscaloosa, AL
Dr. J.B. Jordon , University of Alabama, Tuscaloosa, AL
Mr. Omar Rodriguez , University of Alabama, Tuscaloosa, AL
Mr. Zack McClelland , US Army ERDC, Vicksburg, MS
Dr. Wilburn Whittington , Mississippi State University, Starkville, MS
Dr. David Francis , Mississippi State University, Starkville, MS
Dr. Jianqing Su , Aeroprobe Corporation, Christiansburg, VA
Mr. Rich Martens , University of Alabama, Tuscaloosa, AL
Ms. Nanci Hardwick , Aeroprobe Corporation, Christiansburg, VA
The Solid State Additive Manufacturing (SSAM) process referred to as Additive Friction Stir (AFS) provides a new path for coating, joining and additively manufacturing materials such as Inconel 625. This additive manufacturing process differs from traditional friction stir welding since metal powder or solid rod is fed through a non-consumable rotating cylindrical tool generating heat and plastically deforming the feedstock material through controlled pressure from the tool as successive layers are built upon a substrate. In this research, the dynamic recrystallization and grain refinement is characterized for the successive layers in as-deposited samples using Electron Backscattered Diffraction (EBSD). The EBSD results depict grain structures formed by dynamic recrystallization (DRX) with even finer grain structures forming at the layer interfaces. Tensile behavior of these fine-grained structures is also characterized at both quasi-static (0.001/s) and high strain rate (1500/s) using electromechanical and a direct tension-Kolsky bar, respectively.
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