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 language | English |
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Article number | 362 |
Journal | Metals |
Volume | 10 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2020 Mar |
Externally published | Yes |
Keywords
- Creep
- Inconel 718
- Selective laser melting
- Vacuum
ASJC Scopus subject areas
- Materials Science(all)