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Mechanical properties of additively manufactured TPMS structures: effect of heat treatment and dynamic loading
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DOI：10.1007/s40964-026-01893-4.png)
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Abstract
En 中文
Triply periodic minimal surfaces (TPMS), specially made from Inconel 718 (In718), are suitable for aerospace, automotive, and energy sector components due to their superior physical properties. Currently, TPMS structures have been investigated for their mechanical performance under quasi-static compression; however, limited attention is paid to their performance in dynamic loading. In this study the TPMS structures were additively manufactured with suitable processing parameters. Later a multiple-step heat treatment was applied to these TPMSs. Quasistatic and dynamic impact tests at different loading velocities were conducted on those samples using a universal testing machine. The microstructure of the samples was investigated in scanning electron microscopy (SEM), and a comparison was made between the as-built and heat-treated samples. The impact of heat treatment and different phases on their mechanical properties was discussed. It was found that heat treatment has made substantial improvements in microstructure: dissolved detrimental phases and precipitated strengthening phases. The results demonstrated significantly higher strength of the TPMS structures under dynamic loading conditions, with the elastic modulus of the diamond TPMS increased by as much as 541%, while other properties were at least doubled compared to quasi-static mechanical properties. In addition, the energy absorption properties were almost doubled under impact loading as compared to the quasistatic loading condition and further improved by the heat treatment process.
Keywords:
Selective laser melting
Triply periodic minimal surfaces
Dynamic properties
Heat treatment
Microstructure
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