Microstructure and creep properties of ni-base superalloy IN718 built up by selective laser melting in a vacuum environment

Toshiki Nagahari, Taigi Nagoya, Koji Kakehi, Naoko Sato, Shizuka Nakano

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Selective laser melting (SLM) in a vacuum environment is a relatively new process. Although the material is expected to undergo a gradual heat change, which will influence the microstructure and creep properties of IN718, little research has been conducted to date. Here, we compared specimens built in vacuum (V-SLM) to those built in an Ar atmosphere (Ar-SLM). We investigated the microstructure and creep properties of V-SLM, and compared the V-SLM specimen to a conventional Ar-SLM specimen. The V-SLM specimen had a larger-grained texture, and the quantity of the δ phase was much lower. In addition, the V-SLM specimen had lower amounts of aluminum and titanium oxides, which improved the stability of the γ” phase. Thus, the V-SLM specimen showed better creep life than the Ar-SLM, due to prevention of brittle fractures along the interdendritic regions.

Original languageEnglish
Article number362
JournalMetals
Volume10
Issue number3
DOIs
Publication statusPublished - 2020 Mar
Externally publishedYes

Keywords

  • Creep
  • Inconel 718
  • Selective laser melting
  • Vacuum

ASJC Scopus subject areas

  • Materials Science(all)

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