Block and sub-block boundary strengthening in lath martensite. (15th April 2016)

• Record Type: Journal Article
• Authors: Du, C.; Hoefnagels, J.P.M.; Vaes, R.; Geers, M.G.D.
• Is Part Of: Scripta materialia. Volume 116(2016)
• Page Start: 117
• Page End: 121
• Publication Date: 2016-04-15
• Subjects: Lath martensite -- Boundaries -- Strengthening mechanism -- Uniaxial micro-tensile test; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.01.043
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Well-defined uniaxial micro-tensile tests were performed on lath martensite single block specimens and multi-block specimens with different numbers of block boundaries parallel to the loading direction. Detailed slip trace analyses consistently revealed that the {110}<111 > slip system with the highest Schmid factor is activated. Both block and sub-block boundaries act as barriers to dislocation motion, whereby a Hall–Petch like behavior is observed. Sub-block boundary strengthening appears to be only slightly less effective than block boundary strengthening, even though fracture analyses indicate that dislocation motion can cross sub-block boundaries, but not block boundaries. Graphical abstract: