Fabrication of FeMnSi-based shape memory alloy components with graded-microstructures by laser powder bed fusion

• DOI: 10.1016/j.addma.2023.103835
• Publication Date: 2023-10-17T16:32:12Z
• Authors: I. Ferretto; A. Sharma; D. Kim; N.M. Della Ventura; X. Maeder; J. Michler; E. Hosseini; W.J. Lee; C. Leinenbach
• Keywords: Selective Laser Melting; Texture (cosmology); Laser Scanning

This work demonstrates the tailoring of microstructure two FeMnSi-based shape memory alloys during laser powder bed fusion. Significant variations in parts can be induced by modifying scanning speed or strategy process. Specifically, volume phase fractions, texture, and grain size morphology change with applied processing parameters as thermal history experienced material is modified. Additionally, generally undesired Mn evaporation melting deliberately exploited to manipulate composition final microstructure. Taking advantage this, graded-microstructure samples tailored amounts phases (bcc-δ fcc-γ) distinct at different locations fabricated. A good combination pronounced effect ultrahigh strength achieved this way. The findings study offer valuable insights that drive future research advancements additive manufacturing, opening exciting opportunities for fabrication multifunctional high performance materials.