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Modeling of coaxial single and overlap-pass cladding with laser radiation
Publikationstyp
Conference Paper
Date Issued
2012-07
Sprache
English
Start Page
377
End Page
380
Citation
Proceedings of the 37th International MATADOR 2012 Conference: 377-380 (2013-12-01)
Contribution to Conference
Scopus ID
Publisher
Springer
The repair with laser cladding of single crystalline Nibase superalloy gas turbine blades requires specific solidification conditions in order to realize an epitaxic dendritic growth front. For each superalloy there exists a process window concerning solidification conditions within the formation of new grains ahead of the epitaxic dendritic growth front can be prevented. In order to determine this process window a three-dimensional finite element model for laser cladding has been developed. This model emphasizes on a precise calculation of free surface shape of melt pool because the microstructure as processed depends essentially on the solidification conditions around the solidus/liquidus temperature. So due to the small distance between the melt pool surface and the growth front all errors concerning the approximation of melt pool surface and the implementation of boundary conditions will be mapped directly onto the solidification conditions. This model does not use any geometrical approximation of the melt pool surface but determines the melt pool surface shape by the balance equation for capillary forces.
Subjects
FEM
Laser cladding
Modeling
Single crystal
Superalloy
DDC Class
530: Physik