Prior austenite grain size and tempering effects on the dislocation density of low-C Nb–Ti microalloyed lath martensite. (October 2015)

• Record Type: Journal Article
• Authors: Kennett, S.C; Krauss, G.; Findley, K.O.
• Is Part Of: Scripta materialia. Volume 107(2015)
• Page Start: 123
• Page End: 126
• Publication Date: 2015-10
• Subjects: Steel -- Lath martensite -- Prior austenite grain size -- Tempering -- Dislocation density; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.05.036
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: The dislocation density of two as-quenched and quenched and tempered low-C Nb–Ti microalloyed martensitic steels was measured with X-ray diffraction for a range of prior austenite grain sizes. The dislocation density decreases with increasing prior austenite grain size in the as-quenched condition but the opposite occurs after high temperature tempering. The flow strength of all conditions is a function of dislocation density and follows a Taylor hardening model. The properties are insensitive to Nb microalloying for the two alloys assessed.