AccScience Publishing / MSAM / Online First / DOI: 10.36922/MSAM026040009
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ORIGINAL RESEARCH ARTICLE

Anisotropy of room- and high-temperature mechanical properties in GH5188 superalloy fabricated by laser powder bed fusion

Gao Huang1,2 ,  Huihui Yang3 ,  Xiaojie Nie4 ,  Yang Qi5*
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1 Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei, China
2 Huagong Technology Industry Co., Ltd., Wuhan, Hubei, China
3 Suzhou National Laboratory, Suzhou, Jiangsu, China
4 Naval University of Engineering, Wuhan, Hubei, China
5 Taihang Laboratory, Chengdu, Sichuan, China
MSAM, 026040009 https://doi.org/10.36922/MSAM026040009
Received: 24 January 2026 | Revised: 25 February 2026 | Accepted: 5 March 2026 | Published online: 18 May 2026
(This article belongs to the Special Issue Additive Manufacturing of Materials for Extreme Environments)
© 2026 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

Laser powder bed fusion (LPBF) enables near-net-shape fabrication of GH5188 for hot-section applications, but orientation-dependent mechanical reliability remains insufficiently quantified. In this study, tensile tests were conducted at room temperature and 900 °C along the horizontal and vertical directions for LPBF-fabricated GH5188 in the as-fabricated (AF) and heat-treated (HT) states, and the results were correlated with microstructural characterization by scanning electron microscopy and electron backscatter diffraction. The results showed that the AF condition exhibited high strength with weak tensile anisotropy at room temperature and 900 °C. Heat treatment markedly reduced YS and improved ductility at both temperatures, and it also led to a more evident orientation dependence at 900 °C. Microstructural analyses indicated that the AF state presented LPBF hierarchical features that contribute to high initial flow resistance, whereas heat treatment removed these features and produced section-dependent grain and grain-boundary evolution, increasing the relative influence of grain-scale deformation at high temperature. This study provides an orientation-dependent AF/HT dataset and a microstructure-based interpretation of anisotropy evolution in LPBF GH5188, which is relevant to the qualification and design of high-temperature additive manufacturing components.

Graphical abstract
Keywords
GH5188
Laser powder bed fusion
Anisotropy
Mechanical properties
Microstructure
Funding
This work was supported by the Taihang Laboratory Project (No. BK123) and the National Natural Science Foundation of China (Nos. 52305490 and 62505373).
Conflict of interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Materials Science in Additive Manufacturing, Electronic ISSN: 2810-9635 Published by AccScience Publishing
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