About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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Presentation Title |
Microstructure and Mechanical Properties of New Compositionally-Complex Fe-Cr-Mn-Al Ferritic Stainless Steels Free of σ-Phase, χ-Phase and 475 °C Embrittlement |
Author(s) |
Kevin J. Laws, Stephanie Blankley, Douglas Raigosa, Natalie Krieger, Jackson Baker, Joel Luke Abraham, Kaitlyn Paulsen, Alexandra Loumidis , Fadlin Natsition, Karen Privat, Patrick Lars Joseph Conway, Lori Bassman |
On-Site Speaker (Planned) |
Kevin J. Laws |
Abstract Scope |
A series of new compositionally-complex Fe-Cr-Mn-Al disordered BCC alloys, (ferritic stainless steels), have been developed. The microstructural evolution and associated mechanical properties of these alloys with regard to formation of the σ-phase, χ-phase and αFe-αCr' phase separation may be tailored over a broad, Fe-based composition range. In combination with Mn, the addition of Al reduces or eliminates the formation of both the σ- and χ-phases. The progressive addition of Mn-content from 5-25 at.% contracts the αFe+αCr' immiscibility gap, opening a broader, stable αFe solid solution composition range at higher Cr-contents. Mechanically, alloys found within the extended multicomponent αFe phase field or in proximity to the αFe-αCr' transition boundary exhibit 25-35% tensile elongation and ductile, transgranular failure. Both the yield and ultimate tensile strengths of these alloys are generally higher than existing austenitic and ferritic stainless steels, ranging 370-530MPa and 460-600MPa respectively. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Iron and Steel |