Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels

Y. Q. Wang; S. J. Clark; B. Cai; D. Alba Venero; K. Yun; M. Gorley; E. Surrey; D. G. McCartney; S. Sridhar; P. D. Lee

doi:10.1016/j.scriptamat.2019.08.016

Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels

Y. Q. Wang, S. J. Clark, B. Cai, D. Alba Venero, K. Yun, M. Gorley, E. Surrey, D. G. McCartney, S. Sridhar, P. D. Lee

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

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 ~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.

Original language	English (US)
Pages (from-to)	24-28
Number of pages	5
Journal	Scripta Materialia
Volume	174
DOIs	https://doi.org/10.1016/j.scriptamat.2019.08.016
State	Published - Jan 1 2020
Externally published	Yes

Keywords

Interphase precipitation
Micro-alloyed steel
Small-angle-scattering

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2019.08.016

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title = "Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels",

abstract = "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 ~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.",

keywords = "Interphase precipitation, Micro-alloyed steel, Small-angle-scattering",

author = "Wang, {Y. Q.} and Clark, {S. J.} and B. Cai and Venero, {D. Alba} and K. Yun and M. Gorley and E. Surrey and McCartney, {D. G.} and S. Sridhar and Lee, {P. D.}",

note = "Publisher Copyright: {\textcopyright} 2019 Acta Materialia Inc.",

year = "2020",

month = jan,

day = "1",

doi = "10.1016/j.scriptamat.2019.08.016",

language = "English (US)",

volume = "174",

pages = "24--28",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels

AU - Wang, Y. Q.

AU - Clark, S. J.

AU - Cai, B.

AU - Venero, D. Alba

AU - Yun, K.

AU - Gorley, M.

AU - Surrey, E.

AU - McCartney, D. G.

AU - Sridhar, S.

AU - Lee, P. D.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - 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 ~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.

AB - 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 ~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.

KW - Interphase precipitation

KW - Micro-alloyed steel

KW - Small-angle-scattering

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U2 - 10.1016/j.scriptamat.2019.08.016

DO - 10.1016/j.scriptamat.2019.08.016

M3 - Article

AN - SCOPUS:85071244658

SN - 1359-6462

VL - 174

SP - 24

EP - 28

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels

Abstract

Keywords

ASJC Scopus subject areas

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