| Abstract Scope |
Manufacturing in many sectors, including nuclear power, is transforming because of metal additive manufacturing (AM). However, challenges remain with respect to performance properties, such as strength, fracture, and fatigue, that depend on the material state including texture, microstructure, and residual stress. Hybrid AM is an approach to change samples without additional materials or varying the chemistry. Ultrasonic peening (UP) is the hybrid process studied here on 316L stainless steel. In this presentation, the mechanical performance of UP-AM from laser powder bed fusion (LPBF) is reported in comparison with non-hybrid AM samples. In addition, ultrasonic nondestructive evaluation approaches are leveraged to quantify the UP-AM builds in terms of the strength of the peening and the positions of layers. Microstructural models are used to study the impact on ultrasonic scattering to quantify the changes from peening. This research is expected to impact materials for extreme environments as needed by the power industry. |