Dislocation density in cellular rapid solidification using phase field modeling and crystal plasticity

A coupled phase field and crystal plasticity model is established to analyze formation of dislo-cation structures and residual stresses during rapid solidification of additively manufactured 316L stainless steel. The work focuses on investigating the role of microsegregation related to the intra-grain cellular microstructure of 316L. Effect of solidification shrinkage is considered along with dislocation mediated plastic flow of the material during solidification. Different cellular micro-structures are analyzed and the characteristics of the cell core, boundary and segregation pools are discussed with respect to heterogeneity of dislocation density distributions and residual stresses. Quantitative comparison with experimental data is given to evaluate the feasibility of the modeling approach.

Automated summary

A coupled phase field and crystal plasticity model is used to analyze the formation of dislocation structures and residual stresses during the rapid solidification of additively manufactured 316L stainless steel. The study reveals the significant influence of microsegregation related to the intra-grain cellular microstructure on the microstructure and mechanical properties.