Majeed, Mobin, and Situ, Rong (2025) Quasistatic mechanical properties of Inconel 718 Triply Periodic Minimal surfaces: Effect of standard heat treatments on compressive strength and energy absorption. Progress in Additive Manufacturing. (In Press)

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Abstract

Triply Periodic Minimal Surfaces (TPMS) structures fabricated from Inconel 718 (In718) via selective laser melting (SLM) found their potential applications in the aviation and energy industries owing to their excellent anticorrosive properties and thermal stability. However, the SLM process induces micro-segregation, anisotropic mechanical properties, and detrimental phases (Laves, δ) which degrade its mechanical properties. Although heat treatment has shown promising results for bulk In718 material, its impact on TPMS structures has received very limited attention. This research investigates the impact of standard heat treatments, including stress relieving (SR), homogenization plus ageing (HSA), and direct ageing (DA), on the properties of diamond and gyroid TPMS structures. The quasistatic compression tests were conducted in an Instron machine, and material characterization was conducted in Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD). HSA treatment has led to maximum improvement; the compressive strength and yield strength of diamond TPMS were improved by 58.55 % and 93.5% respectively, due to the precipitation of strengthening phases (γ' and γ'') and dissolution of detrimental phases. HSA and DA treatments led to stretch dominated deformation and higher energy absorption capacity. Conversely SR treatment has shown bending dominated deformation behaviour and degraded mechanical properties in contrast to the previous studies on tensile samples.

Item ID:	86468
Item Type:	Article (Research - C1)
ISSN:	2363-9512
Keywords:	Selective laser melting, In718, triply periodic minimal surfaces, heat treatment, mechanical properties
Copyright Information:	© The Author(s) 2025. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Date Deposited:	05 Aug 2025 01:24
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