Effects of solution ageing in compressive behaviour of SLM-In718 triply periodic minimal surfaces

作者：Mobin Majeed, Rong Situ, Zia Javanbakht · 发表于：Progress in Additive Manufacturing · 年份：2025 · DOI：10.1007/s40964-025-01025-4 · 被引用次数：9 · 研究领域：Adhesion, Friction, and Surface Interactions、Additive Manufacturing and 3D Printing Technologies、Cellular and Composite Structures

Abstract This study aims to investigate the effect of heat treatment on the microstructure and mechanical properties of triply periodic minimal surface (TPMS) structures manufactured by selective laser melting (SLM) from Inconel ® alloy 718 (In718). Although many aspects of SLM-In718 have been studied, its as-built (AB) and heat treated (HT) performance under compression has not been thoroughly investigated. To this end, sheet-based diamond, gyroid, and primitive morphologies along with bulk specimens were manufactured and tested under AB and HT conditions. Standard solution ageing (solution treatment + two-step ageing) was carried out to improve some of the inherent deficiencies of SLM-In718 such as the development of brittle Laves and $$\delta$$ δ phases. It was found that the overall mechanical performance of the HT TPMS specimens were improved in terms of stiffness, strength, and energy absorption among others. Furthermore, the geometry of the TPMS specimens dictated the extent of enhancement such that the diamond geometry outperformed the others in many aspects. In contrast, the primitive structure demonstrated the most stable plateau stage in both AB and HT conditions. Microstructural analysis revealed occasional precipitation of second-phases carbide particles at grain boundaries. Moreover, niobium was made available by dissolution of Laves phases during solution treatment which was later used in precipitation of strengthening $$\gamma ^{\prime}$$ γ ′ ...