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On the dendritic growth and microsegregation in Ni-base superalloys IN718, IN625 and IN939
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Ceramics.ORCID iD: 0000-0003-0864-3679
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
2005 (English)In: High Temperature Materials and Processes, ISSN 0334-6455, E-ISSN 2191-0324, Vol. 24, no 4, 221-238 p.Article in journal (Refereed) Published
Abstract [en]

Directional Solidification and Quenching (DSQ) has been used to analyse the solidification, segregation and precipitation behaviour of the Ni-base alloys IN718, IN625 and IN939. The microsegregation in the primary solidified gamma-phase was analysed by Energy Dispersive Spectroscopy (EDS) and were mainly found to be Nb for alloy IN718 and Ti for alloy IN939. The microsegregation behaviour were analysed by numerical back diffusion models and it was found that the diffusion rate in the samples was higher than expected from the theory. A suggested explanation was that this was an effect of the formation of lattice defects during the solidification process. The coarsening process that occurs during the further cooling of the samples is proved to be by the mechanism of back diffusion i.e. the smaller secondary dendrite arms grow together with the thicker ones into a plate.

Place, publisher, year, edition, pages
2005. Vol. 24, no 4, 221-238 p.
Keyword [en]
solidification, alloys, cu
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-15157ISI: 000233001700003Scopus ID: 2-s2.0-27744554819OAI: oai:DiVA.org:kth-15157DiVA: diva2:333198
Note
QC 20100525 QC 20111229Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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Eliasson, Anders

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