Abstract Scope |
Controlling failure and lifetimes of engineering components due to fatigue and creep are extremely important in engineering applications and light-weighting designs. These are related to the control of key metallurgical states and mechanical properties at key locations within components, which are normally achieved via thermal-mechanical processing, i.e., forming/shaping processes, of engineering components. Thus, creating an ability to simulate a wide range of high temperature metal forming processes to predict microstructure and mechanical property evolution and distributions of formed parts becomes more important. To achieve this, physically based unified viscoplastic constitutive equations enabling to model the dynamic interaction between viscoplastic flow and microstructure evolution need to be developed, which include grain growth, recrystallisation, precipitation and dislocation. In this presentation, the microstructure evolution, development of physically based viscoplastic constitutive equations, and the procedures for the determinations of the constitutive equations will be discussed. |