Journal
SCRIPTA MATERIALIA
Volume 174, Issue -, Pages 24-28Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.08.016
Keywords
Micro-alloyed steel; Interphase precipitation; Small-angle-scattering
Categories
Funding
- EPSRC [EP/L018705/1, EP/L018632/1, EP/M009688/1]
- Research Complex at Harwell
- RCUK Energy Programme [EP/T012250/1]
- EPSRC [EP/M009688/1, EP/L018632/1, EP/K006649/1, EP/L018705/1, EP/K007734/1, EP/T012250/1] Funding Source: UKRI
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Ti-containing micro-alloyed steels are often alloyed with molybdenum (Mo) to reduce nano-precipitate coarsening, although the mechanism is still disputed. Using small angle neutron scattering we characterised the precipitate composition and coarsening of Ti-alloyed and Ti-Mo-alloyed steels. The results demonstrate similar to 25 at.% of Ti is substituted by Mo in the (Ti, Mo)C precipitates, increasing both the precipitate volume percent and average size. Mo alloying did not retard precipitation coarsening, but improved lattice misfit between precipitate and matrix, contributing to better ageing resistance of the Ti-Mo-alloyed steel. This new understanding opens opportunities for designing ageing-resistant micro-alloyed steels with lean alloying elements. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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