Finite Interface Dissipation Phase Field Modeling of Ni-Nb Under Additive Manufacturing Conditions Institutional Repository Document uri icon


  • During the laser powder bed fusion (L-PBF) process, the built part undergoes multiple rapid heating-cooling cycles, leading to complex microstructures with nonuniform properties. In the present work, a computational framework, which weakly couples a finite element thermal model to a non-equilibrium PF model was developed to investigate the rapid solidification microstructure of a Ni-Nb alloy during L-PBF. The framework is utilized to predict the spatial variation of the morphology and size of cellular segregation structure as well as the microsegregation in single-track melt pool microstructures obtained under different process conditions. A solidification map demonstrating the variation of microstructural features as a function of the temperature gradient and growth rate is presented. A planar to cellular transition is predicted in the majority of keyhole mode melt pools, while a planar interface is predominant in conduction mode melt pools. The predicted morphology and size of the cellular segregation structure agrees well with experimental measurements.

author list (cited authors)

  • Karayagiza, K., Johnson, L., Seede, R., Attari, V., Zhang, B., Huang, X., ... Arroyave, R.

citation count

  • 4

complete list of authors

  • Karayagiza, Kubra||Johnson, Luke||Seede, Raiyan||Attari, Vahid||Zhang, Bing||Huang, Xueqin||Ghosh, Supriyo||Duong, Thien||Karaman, Ibrahim||Elwany, Alaa||Arroyave, Raymundo

Book Title

  • SSRN Electronic Journal

publication date

  • January 2019