Process parameter optimization for selective laser melting of Inconel 718 superalloy and the effects of subsequent heat treatment on the microstructural evolution and mechanical properties

Wang, W. and Wang, S. and Zhang, X. and Chen, F. and Xu, Y. and Tian, Y. (2021) Process parameter optimization for selective laser melting of Inconel 718 superalloy and the effects of subsequent heat treatment on the microstructural evolution and mechanical properties. Journal of Manufacturing Processes, 64. pp. 530-543. ISSN 1526-6125

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Abstract

The Inconel 718 superalloy (IN718) was fabricated by selective laser melting (SLM) successfully in this work. The optimization of process parameters and effects of three heat treatment processes on the microstructures and mechanical properties of samples were also systematically investigated. The relationship equation between relative density (RD) of SLMed samples and energy density (ED) coupled by laser parameters was determined. After the solution aging (SA) heat treatment, a large amount of needle-like δ phases precipitated and the precipitation of ultrafine spherical γ'/γ” strengthening phases as well as complete recrystallization appeared after homogenization + solution aging (HSA) heat treatment. The overall performances of SLMed IN718 samples were improved significantly using the HSA treatment, with the increase of tensile strength from 946 MPa to 1570 MPa.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Manufacturing Processes
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Manufacturing Processes. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Manufacturing Processes, 64, 2021 DOI: 10.1016/j.jmapro.2021.02.004
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2209
Subjects:
ID Code:
152943
Deposited By:
Deposited On:
19 Mar 2021 10:35
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jun 2021 09:03