Memory properties of Fe-xMn-6Si-9Cr-5Ni alloy by laser additive manufacturing with powder cored wire

In order to improve the performance of iron-based memory alloys and control the burning loss of elements during additive manufacturing, Fe-xMn-6Si-9Cr-5Ni (x = 14, 17 ,20) alloy with varying contents of Mn was prepared by laser directed energy deposition with powder cored wire. The shape recovery rate and microstructure of the alloy under different pre-deformation amounts were studied, and the memory performance optimization mechanism of the alloy was explored. The results showed that during powder cored wire laser additive manufacturing of Fe-xMn-6Si-9Cr-5Ni alloy, the burning rate of elements was only 25.6%, and low temperature martensites capable of improving the memory performance of the alloy were generted in the deposited alloy. When the mass fraction of Mn accounted for 17%, the shape recovery rate of the alloy reached 75% (with recoverable deformation at 3%) and 63% (with recoverable deformation at 3.78%) at a pre-deformation of 4% and 6%, respectively.