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Scheil ternary projection (STeP) diagrams for designing additively manufactured functionally graded metals
Rice Univ, Mat Sci & NanoEngn, Houston, TX 77005 USA..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0001-7164-9024
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-4221-8510
Rice Univ, Mat Sci & NanoEngn, Houston, TX 77005 USA..
2020 (English)In: Additive Manufacturing, ISSN 2214-8604, Vol. 32, article id UNSP 101008Article in journal (Refereed) Published
Abstract [en]

Functionally graded metals fabricated using high-temperature additive manufacturing can form intermetallics that fracture during printing due to thermal stresses generated by the heat source. To address this problem, we introduce a new class of non-equilibrium phase diagrams, termed Scheil Ternary Projection (STeP) diagrams, for designing optimal composition gradients that avoid brittle phases. Using the Fe-Cr-Al ternary as a model system, we compare the phase fields in equilibrium and STeP diagrams to show that intermetallic phase fields are dramatically expanded under the rapid solidification conditions in melt-based additive manufacturing, an important effect that must be accounted for when designing composition gradients.

Place, publisher, year, edition, pages
Elsevier BV , 2020. Vol. 32, article id UNSP 101008
Keywords [en]
Functionally graded metals, Non-equilibrium solidification, Scheil-Gulliver model, Powder bed fusion, Directed energy deposition
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-273089DOI: 10.1016/j.addma.2019.101008ISI: 000522928600083Scopus ID: 2-s2.0-85078989735OAI: oai:DiVA.org:kth-273089DiVA, id: diva2:1430523
Note

QC 20200515

Available from: 2020-05-15 Created: 2020-05-15 Last updated: 2020-05-15Bibliographically approved

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Ananthanarayanan, DurgaLindwall, Greta

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