Martensitic transformation within nanotwins enhances fatigue damage resistance of a nanotwinned austenitic stainless steel. (15th January 2022)

• Record Type: Journal Article
• Authors: Li, Q.; Liu, D.Y.; Yan, F.K.; Tao, N.R.
• Is Part Of: Scripta materialia. Number 207(2022)
• Publication Date: 2022-01-15
• Subjects: Nanotwins -- Fatigue -- Austenitic steel, Martensitic transformation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114313
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We investigated the low-cycle fatigue behavior of a novel nanotwinned 316L stainless steel consisting of nanotwinned austenitic grains embedded in the matrix with characteristic dislocation arrangements. We excitingly found that the α\prime-martensitic transformation is activated traversing twin lamellae to undertake the localized deformation of nanotwinned grains at high strain amplitudes. These α\prime-martensite nuclei are mainly originated from the intersections between "zigzag" slip bands and twin lamellae. Thanks to the effective release of stress/strain localization by the α\prime-martensitic transformation within nanotwins, the fatigue strength and fatigue life in the low-cycle regime are simultaneously enhanced. Graphical abstract: Image, graphical abstract