In-situ transmission electron microscopy investigation of the deformation behavior of spinodal nanostructured δ-ferrite in a duplex stainless steel. (December 2016)

• Record Type: Journal Article
• Authors: Hsieh, Yi-Chieh; Zhang, Ling; Chung, Tsai-Fu; Tsai, Yu-Ting; Yang, Jer-Ren; Ohmura, Takahito; Suzuki, Takuya
• Is Part Of: Scripta materialia. Volume 125(2016)
• Page Start: 44
• Page End: 48
• Publication Date: 2016-12
• Subjects: In-situ compression -- Duplex stainless steel -- Scanning/transmission electron microscopy (STEM) -- Spinodal structure -- Dislocation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.06.047
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In-situ compression tests in a transmission electron microscope were carried out to investigate the deformation behavior of δ-ferrite nanopillars of a duplex stainless steel. The δ-ferrite with a spinodal nanostructure, which formed due to aging at 475 °C for 64 h, obviously suppressed the progress of serrated yielding (a series of short strain bursts) relative to that without the spinodal nanostructure. The results revealed that during compression deformation, the spinodal nanostructure confined the movement of dislocations (leading to a significant increase in dislocation density), causing a notable strengthening effect, and also kept the slip band morphology planar. Graphical abstract: Snapshots of deformed nanopillars with the corresponding stress-strain curves: (a) unaged and (b) aged pillars, the latter with spinodal nanostructures.