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The effect of molybdenum on precipitation behaviour in austenite of strip-cast steels containing niobium

Jiang, Lu, Marceau, Ross K. W., Dorin, Thomas, Yin, Huaying, Sun, Xinjun, Hodgson, Peter D. and Stanford, Nicole 2020, The effect of molybdenum on precipitation behaviour in austenite of strip-cast steels containing niobium, Metals, vol. 10, no. 10, doi: 10.3390/met10101330.

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Title The effect of molybdenum on precipitation behaviour in austenite of strip-cast steels containing niobium
Author(s) Jiang, LuORCID iD for Jiang, Lu orcid.org/0000-0002-9938-6243
Marceau, Ross K. W.ORCID iD for Marceau, Ross K. W. orcid.org/0000-0003-3612-8762
Dorin, ThomasORCID iD for Dorin, Thomas orcid.org/0000-0002-1033-961X
Yin, Huaying
Sun, Xinjun
Hodgson, Peter D.
Stanford, Nicole
Journal name Metals
Volume number 10
Issue number 10
Article ID 1330
Total pages 12
Publisher MDPI AG
Place of publication Basel, Switzerland
Publication date 2020-10
ISSN 2075-4701
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
molybdenum
precipitation
austenite
niobium steels
strip casting
MO
NB
ALLOY
EVOLUTION
KINETICS
CARBIDE
(TI
Summary Two low-C steels microalloyed with niobium (Nb) were fabricated by simulated strip casting, one with molybdenum (Mo) and the other without Mo. Both steels were heat treated to simulate coiling at 900 °C to investigate the effect of Mo on the precipitation behaviour in austenite in low-C strip-cast Nb steels. The mechanical properties results show that during the isothermal holding at 900 °C the hardness of both steels increases and reaches a peak after 3000 s and then decreased after 10,000 s. Additionally, the hardness of the Mo-containing steel is higher than that of the Mo-free steel in all heat-treated conditions. Thermo-Calc predictions suggest that MC-type carbides exist in equilibrium at 900 °C, which are confirmed by transmission electron microscopy (TEM). TEM examination shows that precipitates are formed after 1000 s of isothermal holding in both steels and the size of the particles is refined by the addition of Mo. Energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) reveal that the carbides are enriched in Nb and N. The presence of Mo is also observed in the particles in the Nb-Mo steel during isothermal holding at 900 °C. The concentration of Mo in the precipitates decreases with increasing particle size and isothermal holding time. The precipitates in the Nb-Mo steel provide significant strengthening increments of up to 140 MPa, higher than that in the Nb steel, ~96 MPa. A thermodynamic rationale is given, which explains that the enrichment of Mo in the precipitates reduces the interfacial energy between precipitates and matrix. This is likely to lower the energy barrier for their nucleation and also reduce the coarsening rate, thus leading to finer precipitates during isothermal holding at 900 °C.
Notes This article belongs to the Special Issue Strip Casting of Metals and Alloys
Language eng
DOI 10.3390/met10101330
Indigenous content off
Field of Research 0914 Resources Engineering and Extractive Metallurgy
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2020, The Authors
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30143492

Document type: Journal Article
Collections: Institute for Frontier Materials
Open Access Collection
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.