Modelling of particle strengthening in the γ’ and oxide dispersion strengthened nickel-base superalloy PM3030

The mechanical strength of the nickel-base superalloy PM 3030 is modelled applying well-established models of particle strengthening. The Orowan and the interfacial pinning approach are convenient for describing oxide dispersion strengthening (ODS) over the temperature range from room temperature up to 1200 °C. For modelling the γ′ strengthening a modification of the Copley and Kear approach is necessary. Contrary to the original approach, the friction stress in the matrix is taken into account yielding a linear superposition of γ′ particle strengthening and strength of the γ matrix. With the modifications introduced in this work an accurate modelling of the yield strength of PM 3030 versus temperature up to approximately 800 °C is obtained. Above this temperature, the γ′ particles become unstable and start dissolving with the consequence of changing particle parameters leading to an overestimation of γ′ strengthening of PM 3030.