세미나

3D printing of smart material for smart structures using laser powder bed fusion of Fe-based shape memory alloy

 

Wookjin Lee

School of Materials Science and Engineering, Pusan National University

 

Abstract

 

The additive manufacturing of shape memory materials, commonly known as 4-dimensional (4D) printing, facilitates the achievement of a complex 3D structure that possesses a temperature-dependent shape change functionality. 4D printing facilitates the fabrication of new functional and smart structures such as artificial muscles, self-healing and shape morphing devices. 4D-printed Fe–Mn–Si shape memory alloys (Fe-SMAs) have attracted considerable attention over the last two decades owing to their potential application in civil and structural engineering. In this seminar, new functionalities of printed Fe-SMAs with complex 3D structures prepared through laser powder bed fusion (L-PBF) are presented. The printed Fe-SMAs manifest shape recovery behavior, demonstrating that material-inherent functional behaviors can be combined with the functionalities of the complex 3D structures to facilitate shape morphing, self-healing, and auxetic behavior and to achieve a lattice structure with extraordinary specific strength.