About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Progressive Solutions to Improve the Corrosion Resistance of Nuclear Waste Storage Materials
|
| Presentation Title |
Measuring Residual Stresses in Additively Manufactured Large 316L Stainless Steel Rings on VULCAN |
| Author(s) |
Dunji Yu, Wei Tang, Ke An, Harley Skorpenske, Dominic Giuliano, Oscar Martinez, Andrzej Nycz |
| On-Site Speaker (Planned) |
Dunji Yu |
| Abstract Scope |
Recent advancement in additive manufacturing (AM) enables producing large components or structures for broad engineering applications. Crack-inducing residual stress characterization and mitigation is prominent in additive manufacturing. Neutron diffraction has been well known as an advanced tool for non-destructive measurement of residual stresses in engineering components given neutrons’ high penetration into typical engineering materials. In this work, we mapped the residual stresses in two large additively manufactured 316L stainless steel rings (one 914 mm (3 ft) in diameter, 305 mm (1 ft) in height, 19 mm (¾ inch) in thickness, and one 550 mm (21.65 inch) in diameter, 400 mm (15.75 inch) in height and 19 mm (¾ inch) in thickness), which were produced by wire arc direct energy deposition. While we used the well-established measurement protocol for three orthogonal components of stress in the smaller ring where the ring is placed with its axis in vertical and horizontal directions, the larger ring was securely placed with its axial direction in 60 degrees to the ground normal. This way enables the key hoop strain measurement and also serves two critical purposes: to reduce the footprint of the whole setup including the supporting frame so to avoid any collision conflict with the instrument during residual stress mapping measurement; to reduce the unnecessary neutron path within the attenuating iron so to alleviate neutron attenuation and enhance the measurement efficiency. The measured stresses in the two rings show consistent trends near the outer diameter that the tensile hoop residual stress gradually reduces to near zero along the building direction, while the tensile axial residual stress builds up and the radial residual stress remains relatively low and does not vary much along the building direction. Near the mid diameter, all three stresses appear relatively low, while near the inner diameter, some compressive axial residual stresses build up along the building direction.
Acknowledgement: This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The beam time was allocated to BL-7 VULCAN on proposal number IPTS-29476. |