| Abstract Scope |
Metal additive manufacturing has great potential in industries, but residual stress that arise in the additively manufactured parts has become a critical bottleneck for applications, due to its detrimental effect on mechanical properties. In this work, a crystal plasticity model which predicts the micro-scale residual stress of additively manufactured parts is developed, where both the temperature profiles from the thermal-fluid flow simulation and the grain structure from the phase-field grain growth simulation are incorporated. Residual stiffness method is applied in this model to simulate the melting and solidification phenomena in additive manufacturing process. The simulation results for 316L stainless steel by selective laser melting are compared with recently published experimental results for validation. This model provides new insights into the formation and evolution of residual stress, and specifically presents the correlation between plastic deformation, grain structure and residual stress. |