|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||Microstructure and Mechanism Based Lifetime Predictions in Various Weldment Failures Under Complex Thermomechanical Conditions
||Yi Yang, Yanfei Gao, Jorge Penso, Zhili Feng
|On-Site Speaker (Planned)
Stress relief cracking and other high-temperature failures on/near weldments are a major issue dictating structural integrity and performance. Complex synergetic factors affect the generation/evolution of welding residual stress, which in turn controls the lifetime. Various mechanisms have been proposed in the past, but lacking a direct and quantitative connection between laboratory tests and actual lifetime prediction. Two critical issues are identified and addressed by our research team. 1)a quantitative prediction of welding residual stress is very sensitive to the dynamic strain-hardening behavior in the material constitutive law. Characterization of such property and also non-destructive residual stress measurements by advanced diffraction techniques are needed. 2)microstructure-based lifetime prediction framework has been developed that simulates the entire processes of intergranular cavity nucleation and growth, together their coalescence into grain boundary cracks. The roles of precipitate kinetics on/near grain boundaries and stress relaxation due to precipitate-dependent viscoplastic deformation can also be incorporated and investigated.
||Joining, Modeling and Simulation, Mechanical Properties