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

Matti Lindroos (1) , Tatu Pinomaa (1) , Kais Ammar (2) , Anssi Laukkanen (1) , Nikolas Provatas (3) , Samuel Forest (2)

1 VTT - VTT Technical Research Centre of Finland
2 CDM - Centre des Matériaux
3 McGill University = Université McGill [Montréal, Canada]

A coupled phase field and crystal plasticity model is established to analyze formation of dislocation 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 intragrain cellular microstructure of 316L. Effect of solidification shrinkage is considered along with dislocation mediated plastic flow of the material during solidification. Different cellular microstructures 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.

Domaines: Mécanique des matériaux [physics.class-ph]

Matti Lindroos, Tatu Pinomaa, Kais Ammar, Anssi Laukkanen, Nikolas Provatas, et al.. Dislocation density in cellular rapid solidification using phase field modeling and crystal plasticity. International Journal of Plasticity, 2022, 148, pp.103139. ⟨10.1016/j.ijplas.2021.103139⟩. ⟨hal-03589985⟩