Compositionally graded joints between magnetically dissimilar alloys achieved through directed energy deposition. (September 2021)

• Record Type: Journal Article
• Authors: Firdosy, Samad; Ury, Nicholas; Kustas, Andrew B.; Carroll, Jay D.; Pathare, Priya; Casias, Zachary; Tung, Daniel; Susan, Don; Bobbitt, N. Scott; Chandross, Michael; Borgonia, J.P.; Ravi, Vilupanur A.; Dillon, R. Peter
• Is Part Of: Scripta materialia. Number 202(2021)
• Publication Date: 2021-09
• Subjects: Laser engineered net shaping -- Directed energy depostion -- Additive manufacturing -- Soft magnetic materials -- Gradient alloys; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114005
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Compositionally graded cylinders comprising FeCo-2V, a soft magnetic alloy, and 316L stainless steel, were produced by directed energy deposition incorporating two different gradient lengths. Five distinct regions in the microstructure were observed in both the as-printed and annealed gradients. When normalized for the gradient length, the gradients showed similar grain size and microhardness profiles. In tensile tests, the as-printed samples failed in the 316L region with an effective total "composite" strain of 20-30% and overall strength approaching that of wrought 316L. The annealed samples failed in the FeCo-2V region. Neither exhibited failure in the gradient region. Molecular dynamics simulations were used to calculate tensile strength as a function of composition, showing good correlation to experimental trends but not absolute values. This work demonstrates the tunability of site-specific properties using blown powder directed energy deposition to gradually grade from FeCo-2V to 316L stainless steel in a monolithic component. Graphical Abstract: Image, graphical abstract