Campus Units

Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2-2018

Journal or Book Title

Materials Characterization

Volume

136

First Page

398

Last Page

406

DOI

10.1016/j.matchar.2018.01.006

Abstract

Inconel 718 alloy samples were fabricated by selective laser melting (SLM). Microstructure and precipitation in solution-heat-treated- and double-aging-SLM-made Inconel 718 were studied by scanning and transmission electron microscopy. Electron microscope observations showed that disc-shaped and cuboidal γ″, and circular γ′ precipitates with an average size of 10–50 nm developed within cellular γ austenite matrix. The simulated, experimentally observed electron diffraction patterns, and dark-field imaging further revealed that the precipitation of three variants of γ″ in the γ matrix occurred. The coarser acicular γ″, and globular as well as plate-like δ phases precipitated at grain boundaries and also within the interior of austenite matrix. The morphology, distribution and crystallography of these precipitates and their formation mechanisms were analyzed and discussed.

Comments

This is a manuscript of an article published as Cao, G. H., T. Y. Sun, C. H. Wang, Xing Li, M. Liu, Z. X. Zhang, P. F. Hu, A. M. Russell, R. Schneider, D. Gerthsen, Z. J. Zhou, C. P. Li, and G. F. Chen. "Investigations of γ′, γ ″and δ precipitates in heat-treated Inconel 718 alloy fabricated by selective laser melting." Materials Characterization 136 (2018): 398-406. DOI: 10.1016/j.matchar.2018.01.006. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Elsevier Inc.

Language

en

File Format

application/pdf

Available for download on Sunday, January 05, 2020

Published Version

Included in

Metallurgy Commons

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