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

Yiqiang Wang; Samuel James Clark; Biao Cai; Diego Alba Venero; K Yan; Michael J Gorley; Elizabeth Surrey; David McCartney; Seetharaman S Sridhar; Peter 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

Yiqiang Wang, Samuel James Clark, Biao Cai, Diego Alba Venero, K Yan, Michael J Gorley, Elizabeth Surrey, David McCartney, Seetharaman S Sridhar, Peter D Lee

Metallurgy and Materials

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

2 Citations (Scopus)

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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
Pages (from-to)	24-28
Number of pages	5
Journal	Scripta Materialia
Volume	174
Early online date	27 Aug 2019
DOIs	https://doi.org/10.1016/j.scriptamat.2019.08.016
Publication status	Published - 1 Jan 2020

Keywords

Micro-alloyed steel
interphase precipitation
small-angle scattering

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Wang_et_al_Small-angle_neutron_scattering_reveals_the_effect_of_Mo_on_interphase_nano-precipitation_in_Ti-Mo_micro-alloyed_steels_Scripta_Materialia_2019Accepted author manuscript, 336 KBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

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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 = "Micro-alloyed steel, interphase precipitation, small-angle scattering",

author = "Yiqiang Wang and Clark, {Samuel James} and Biao Cai and Venero, {Diego Alba} and K Yan and Gorley, {Michael J} and Elizabeth Surrey and David McCartney and Sridhar, {Seetharaman S} and Lee, {Peter D}",

year = "2020",

month = jan,

day = "1",

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

language = "English",

volume = "174",

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journal = "Scripta Materialia",

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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, Yiqiang

AU - Clark, Samuel James

AU - Cai, Biao

AU - Venero, Diego Alba

AU - Yan, K

AU - Gorley, Michael J

AU - Surrey, Elizabeth

AU - McCartney, David

AU - Sridhar, Seetharaman S

AU - Lee, Peter 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 - Micro-alloyed steel

KW - interphase precipitation

KW - small-angle scattering

UR - http://www.scopus.com/inward/record.url?scp=85071244658&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2019.08.016

DO - 10.1016/j.scriptamat.2019.08.016

M3 - Article

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

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