Advanced Real Time Imaging: Poster Session
Sponsored by: TMS Functional Materials Division, TMS Structural Materials Division, TMS: Advanced Characterization, Testing, and Simulation Committee, TMS: Alloy Phases Committee, TMS: Biomaterials Committee
Program Organizers: Jinichiro Nakano, MatterGreen; David Alman, National Energy Technology Laboratory; Il Sohn, Yonsei University; Hiroyuki Shibata, Tohoku University; Antoine Allanore, Massachusetts Institute of Technology; Noritaka Saito, Kyushu University; Anna Nakano, US Department of Energy National Energy Technology Laboratory; Zuotai Zhang, Sourthern University of Science and Technology; Candan Tamerler, University of Kansas; Bryan Webler, Carnegie Mellon University; Wangzhong Mu, KTH Royal Institute of Technology; David Veysset, Stanford University; Pranjal Nautiyal , University of Pennsylvania
Tuesday 5:30 PM
March 21, 2023
Room: Exhibit Hall G
Location: SDCC
L-9: In-situ Magnetic Computed Tomography for Additive Manufacturing: Bhairav Ramanathan1; 1Georgia Institute of Technology
X-ray computed Tomography (CT) scanning has been the method of choice to scan additively manufactured parts to identify internal features and defects without resorting to destructive exploratory methods. The X-ray CT process can take hours to days to yield a single reconstructed image which causes huge research bottlenecks. To remedy this shortcoming of X-ray physics, the authors propose a novel magnetic CT system which can scan parts in around 2 minutes. The system consists of a square wave driven magnetic coil and a hall effect sensor which are on either side of the part to be imaged. This project makes use of an Okuma Multus mill-turn machine to perform a 360-degree rotation of the part (clamped in the lathe chuck) and incrementally moves the hall effect sensor in a grid pattern to form each two-dimensional image. The authors will present their work on Magnetic CT for various materials and geometries.
Cancelled
Reinforcement of Band Delta-Ferrite Stability by Secondary Particles in AISI 416 Stainless Steel Investigated by In-situ Characterization: Qianren Tian1; Jianxun Fu2; Wangzhong Mu3; 1Shanghai University; KTH Royal Institute of Technology; 2Shanghai University; 3KTH Royal Institute of Technology
The mechanical characteristics of AISI 416 stainless steel at high temperature, such as hot rolling cracking, can be negatively impacted by band δ-ferrite. This work investigated the effect of secondary particles,M23C6 and sulfide, on the band δ-ferrite stability in AISI 416 stainless steel by combining confocal laser scanning microscopy (CLSM) and electron probe micro-analyzer (EPMA). The secondary particles act as the barriers to the diffusion of Cr and C in the band, this effect enhances the stability of the band at the rolling temperature (1170 °C). The length and width of each grain in band δ-ferrite are approximately 15 to 20 and 5 μm, respectively. The spacing between the bands is in the range of 30 to 60 μm. During the cooling process, these bands are difficult to transform into martensite at a cooling rate of 5°C/s, which might be the reason to lead to the steel cracking.