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Tensile, fatigue and creep response characterisation of direct energy deposited Inconel 718: anisotropy and effects of heat treatment

Year: 2025

Type: article

Abstract: This study reports the outcomes of a comprehensive mechanical testing programme for direct energy deposited Inconel 718 in as-built and heat-treated conditions. After investigating the microstructure and hardness of the alloy in both conditions, the study focuses on investigating the tensile, strain-controlled low cycle, stress-controlled high cycle fatigue, as well as the creep response of the alloy for samples loaded parallel and perpendicular to the build direction. The tensile tests were conducted at room temperature and at 600, 650, and 700°C; creep tests were conducted at 650°C, and fatigue tests were performed at room temperature. It was found that samples loaded perpendicular to the build direction show superior tensile and creep strength for both as-built and heat-treated states. Furthermore, heat treatment consistently enhanced the tensile and creep strength of the alloy. Meanwhile, a lower level of anisotropy and difference between as-built and heat-treated responses was observed from fatigue response of the alloy.

Source: Materials at High Temperatures

DOI: 10.1080/09603409.2025.2536399

Authors: Sergei Egorov, Darko Milovanović, Fabian Soffel, Stuart Holdsworth, Konrad Wegener, Ehsan Hosseini

Institutions: ETH Zurich, Inspire, Institute of Machine Tools and Manufacturing, Swiss Federal Laboratories for Materials Science and Technology

Language: English

Topic: Additive Manufacturing Materials and Processes

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Funders: Eidgenössische Technische Hochschule Zürich, Innosuisse - Schweizerische Agentur für Innovationsförderung

Award: G4496703189