NDLI: Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process

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Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process

Content Provider	MDPI
Author	Fayed, Eslam M. Saadati, Mohammad Shahriari, Davood Brailovski, Vladimir Jahazi, Mohammad Medraj, Mamoun
Copyright Year	2021
Description	In the present study, multi-objective optimization is employed to develop the optimum heat treatments that can achieve both high-mechanical performance and non-distinctive crystallographic texture of 3D printed Inconel 718 (IN718) fabricated by laser powder bed fusion (LPBF). Heat treatments including homogenization at different soaking times (2, 2.5, 3, 3.5 and 4 h) at 1080 °C, followed by a 1 h solution treatment at 980 °C and the standard aging have been employed. 2.5 h is found to be the homogenization treatment threshold after which there is a depletion of hardening precipitate constituents (Nb and Ti) from the γ-matrix. However, a significant number of columnar grains with a high fraction (37.8%) of low-angle grain boundaries (LAGBs) have still been retained after the 2.5 h homogenization treatment. After a 4 h homogenization treatment, a fully recrystallized IN718 with a high fraction of annealing twins (87.1%) is obtained. 2.5 and 4 h homogenization treatments result in tensile properties exceeding those of the wrought IN718 at both RT and 650 °C. However, considering the texture requirements, it is found that the 4 h homogenization treatment offers the optimum treatment, which can be used to produce IN718 components offering a balanced combination of high mechanical properties and adequate microstructural isotropy.
Starting Page	144
e-ISSN	20754701
DOI	10.3390/met11010144
Journal	Metals
Issue Number	1
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-01-12
Access Restriction	Open
Subject Keyword	Metals Manufacturing Engineering Heat Treatment Optimization Additive Manufacturing Laser Powder Bed Fusion Nickel-based Superalloy In718 High-temperature Mechanical Properties
Content Type	Text
Resource Type	Article

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