| Abstract Scope |
Additive manufacturing (AM) has been increasingly used for Ni-base gas turbine components over the last decade. However, compared to conventional Ni-base alloys, AM alloys have distinct microstructures in terms of porosity, texture, precipitate, and residual stress. To replace conventional Ni-base alloys with AM components, the investigation of microstructure and corresponding properties of as-printed and post-treated AM components is critical. Nanoindentation is a unique technique to probe surface properties at the micrometer and sub-micrometer scales in a high-throughput manner, which is a promising tool to explore the localized mechanical property variation stemming from microstructure and residual stress in AM Ni-base alloys. In this presentation, the role of pores, grain anisotropy, precipitates, boundaries, and residual stress on strengthening underneath indenter tip will be investigated by nanoindentation. Meanwhile, their influence on the indentation size effect and pile-up effect will also be discussed. |