Investigation of the mechanical properties of ODS steels at high temperatures using nanoindentation technique

In this study, mechanical properties of two ODS steels, characterized by the same chemical composition yet manufactured by using two different production methods, namely High Isostatic Pressure (HIP) and Hot Extrusion (HE), have been investigated at high temperature by nanoindentation technique. The hardness of the material was evaluated from room temperature up to 600 °C, while initial creep behavior was estimated at room temperature and at 600 °C. In order to better understand the mechanical response of the materials, especially impact of the surface effects, mechanical maps (hardness and reduced young modulus) have been created.