Journal
SCRIPTA MATERIALIA
Volume 107, Issue -, Pages 123-126Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.05.036
Keywords
Steel; Lath martensite; Prior austenite grain size; Tempering; Dislocation density
Categories
Funding
- Advanced Steel Processing and Products Research Center
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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. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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