Dissimilar laser cladding of Inconel 718 powder on A-286 substrate: Microstructural evolution

M. Alizadeh-Sh, S. P. H. Marashi, E. Ranjbarnodeh, R. Shoja-Razavi, João Pedro Oliveira

Research output: Contribution to journalArticle

Abstract

In this work, laser cladding of a Ni-based superalloy powder (Inconel 718) on a Fe-based superalloy (A-286) substrate was performed. The microstructural evolution was studied by optical and electron microscopy techniques, aided by energy dispersive spectroscopy. Additionally, the microhardness along the as-deposited parts was analyzed and correlated with the observed microstructure. It was found that other than austenitic dendrites, Nb-rich carbides, interdendritic Laves networks, and Ti (C, N) were formed; the latter was aided by the presence of pre-existing TiC particles in the substrate. Additionally, a slag oxide layer was seen on the clad surface of the fusion zone. The formation mechanisms of an unmixed zone in the shape of beach and peninsula are discussed.
Original languageEnglish
JournalJournal Of Laser Applications
Volume32
Issue number2
DOIs
Publication statusPublished - May 2020

Keywords

  • laser cladding
  • Inconel 718
  • A-286
  • unmixed zone
  • oxide layer

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