Plasticity of an extra-strong nanocrystalline stainless steel controlled by the "dislocation-segregation'' interaction
N.A. Enikeev (USATU), I.V. Lomakin, M.M. Abramova (USATU), A.M., Mavlyutov, A.A. Lukyanchuk (NRC KI), A.S. Shutov (NRC KI), X. Sauvage (GPM)
TL;DR
This paper investigates how the interaction between dislocation segregation and grain boundary states in nanocrystalline stainless steel influences its strength and plasticity, revealing mechanisms that enable high performance.
Contribution
It introduces a new understanding of how boundary segregation and dislocation interactions can be controlled to enhance steel properties.
Findings
High strength and plasticity achieved in specific boundary states
Dislocation-segregation interactions are key to mechanical performance
Different boundary states significantly affect steel's deformation behavior
Abstract
We study three structurally different states of nanocrystalline 316 steel and show that the state, where boundaries containing excess concentration of alloying elements are combined with mobile dislocations in grain interiors, allows maintaining extraordinarily high strength and remarkably enhanced plasticity. Underlying mechanisms featuring interaction between the segregations and mobile dislocations are discussed.
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