Experimental determination and prediction of the mechanical properties of steel 1.7225

This paper presents experimental results and the analysis of steel 1.7225 at different temperatures. First, experimental results related to the mechanical properties of the material and its resistance to creep are shown using stress–strain and creep curves. Then, the analysis of the sensitivity of the ultimate tensile strength and yield strength with respect to strain rate is given. Modeling of some creep curves using an analytic formula is also presented. An assessment of the fracture toughness based on Charpy impact energy is made. The obtained results show that both ultimate tensile strength and yield strength achieve their maximum at room temperature, but these values are reduced with an increase in temperature up to 650 K. At this temperature, they achieve approximately 20% of initial values. Notably, this steel may be treated as creep resistant only when it is subjected to a low level of stress at considered temperature.