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 1200degreesC. For modelling the gamma' 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 gamma' particle strengthening and strength of the gamma matrix. With the modifications introduced in this work an accurate modelling of the yield strength of PM 3030 versus temperature up to approximately 800degreesC is obtained. Above this temperature, the gamma' particles become unstable and start dissolving with the consequence of changing particle parameters leading to an overestimation of gamma' strengthening of PM 3030. (C) 2004 Elsevier B.V. All rights reserved.