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Small-Angle Neutron Scattering Reveals the Effect of Mo on Interphase Nano-Precipitation in Ti-Mo Micro-Alloyed Steels

16 Pages Posted: 26 Aug 2019 First Look: Accepted

See all articles by Yiqiang Wang

Yiqiang Wang

Culham Science Centre - United Kingdom Atomic Energy Authority; Rutherford Appleton Laboratory - Research Complex at Harwell

S. J. Clark

Rutherford Appleton Laboratory - Research Complex at Harwell; University College London - Department of Mechanical Engineering

Biao Cai

University of Birmingham - School of Metallurgy and Materials

Diego Venero

Rutherford Appleton Laboratory - ISIS

K. Yun

University of Manchester - School of Materials

Mike Gorley

Culham Science Centre - United Kingdom Atomic Energy Authority

Elizabeth Surrey

Culham Science Centre - United Kingdom Atomic Energy Authority

Graham McCartney

Rutherford Appleton Laboratory - Research Complex at Harwell; University of Nottingham - Advanced Materials Group

Sridhar Seetharaman

Colorado School of Mines - Department of Metallurgical and Materials Engineering

Peter Lee

Rutherford Appleton Laboratory - Research Complex at Harwell; University College London - Department of Mechanical Engineering

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 aging resistance of the Ti-Mo-alloyed steel. This new understanding opens opportunities for designing aging-resistant micro-alloyed steels with lean alloying elements.

Keywords: Micro-alloyed steel, Interphase Precipitation, Small-Angle-Scattering

Suggested Citation

Wang, Yiqiang and Clark, S. J. and Cai, Biao and Venero, Diego and Yun, K. and Gorley, Mike and Surrey, Elizabeth and McCartney, Graham and Seetharaman, Sridhar and Lee, Peter, Small-Angle Neutron Scattering Reveals the Effect of Mo on Interphase Nano-Precipitation in Ti-Mo Micro-Alloyed Steels. Available at SSRN: https://ssrn.com/abstract=3441028 or http://dx.doi.org/10.2139/ssrn.3441028

Yiqiang Wang (Contact Author)

Culham Science Centre - United Kingdom Atomic Energy Authority ( email )

United Kingdom

Rutherford Appleton Laboratory - Research Complex at Harwell ( email )

168 Maxwell Ave
Didcot, OX11 0FA
United Kingdom

S. J. Clark

Rutherford Appleton Laboratory - Research Complex at Harwell

168 Maxwell Ave
Didcot, OX11 0FA
United Kingdom

University College London - Department of Mechanical Engineering

Gower Street
London, WC1E 6BT
United Kingdom

Biao Cai

University of Birmingham - School of Metallurgy and Materials ( email )

Edgbaston, Birmingham B15 2TT
United Kingdom

Diego Venero

Rutherford Appleton Laboratory - ISIS

United Kingdom

K. Yun

University of Manchester - School of Materials

United Kingdom

Mike Gorley

Culham Science Centre - United Kingdom Atomic Energy Authority

United Kingdom

Elizabeth Surrey

Culham Science Centre - United Kingdom Atomic Energy Authority

United Kingdom

Graham McCartney

Rutherford Appleton Laboratory - Research Complex at Harwell

168 Maxwell Ave
Didcot, OX11 0FA
United Kingdom

University of Nottingham - Advanced Materials Group

United Kingdom

Sridhar Seetharaman

Colorado School of Mines - Department of Metallurgical and Materials Engineering

United States

Peter Lee

Rutherford Appleton Laboratory - Research Complex at Harwell ( email )

168 Maxwell Ave
Didcot, OX11 0FA
United Kingdom

University College London - Department of Mechanical Engineering ( email )

Gower Street
London, WC1E 6BT
United Kingdom

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