Compositionally graded joints between magnetically dissimilar alloys achieved through directed energy deposition

SCRIPTA MATERIALIA

卷:202

Article

Firdosy, Samad¹  Ury, Nicholas¹  Kustas, Andrew B.²  Carroll, Jay D.²  Pathare, Priya²  Casias, Zachary²  Tung, Daniel²  Susan, Don²  Bobbitt, N. Scott²  Chandross, Michael²  Borgonia, J. P.¹  Ravi, Vilupanur A.^1,3  Dillon, R. Peter¹ 

[1] CALTECH, NASA, Jet Prop Lab, Pasadena, CA 91109 USA

[2] Sandia Natl Labs, Mat Phys & Chem Sci Ctr, Albuquerque, NM 87185 USA

[3] Calif State Polytech Univ Pomona, Pomona, CA 91768 USA

关键词: Laser engineered net shaping;    Directed energy depostion;    Additive manufacturing;    Soft magnetic materials;    Gradient alloys;   

DOI  :  10.1016/j.scriptamat.2021.114005

来源: Elsevier

【 摘 要 】

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. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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