Microstructure and grain growth inhomogeneity in austenitic steel produced by wire-feed electron beam melting: the effect of post-building solid-solution treatment

Elena G. Astafurova, Marina Yu Panchenko, Valentina A. Moskvina, Galina G. Maier, Sergey V. Astafurov, Evgeny V. Melnikov, Anastasia S. Fortuna, Kseniya A. Reunova, Valery E. Rubtsov, Evgeny A. Kolubaev

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

A billet of an AISI 304-type austenitic stainless steel has been built using a wire-feed electron beam additive manufacturing (EBAM) in a layer-by-layer strategy. A microstructure, grain boundary assemble, phase composition and tensile properties of steel billet have been investigated in as-built specimens and after post-built solid-solution treatment. As-built austenitic stainless steel is a highly anisotropic heterophase material with high fraction of interphase boundaries (austenite/ferrite) and intergranular boundaries (austenite/austenite). A macroscopically inhomogeneous (layered) structure with columnar austenitic grain growth has been produced during EBAM processing. The coarse-grained austenitic structure contains δ-ferrite of dendritic morphology in as-built specimens. Ductility and strength properties of the additively manufactured steel show substantial anisotropy, which is strongly correlated with macro- and microstructural peculiarities of the as-built billet. Post-built solid-solution treatment decreases a volume fraction of ferrite in the microstructure, changes the morphology of ferrite phase and, therefore, varies the distribution of interphase boundaries (ferrite/austenite). The effect of post-built solid-solution treatment on tensile properties of the EBAM manufactured steel is discussed taking into account a change in microstructure and phase composition, grain and phase boundary distribution in the specimens.

Original languageEnglish
Pages (from-to)9211-9224
Number of pages14
JournalJournal of Materials Science
Volume55
Issue number22
DOIs
Publication statusPublished - 1 Aug 2020
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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