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Effects of combined silicon and molybdenum alloying on the size and evolution of microalloy precipitates in HSLA steels containing niobium and titanium

Pavlina, Erik J., Van Tyne, C. J. and Speer, J. G. 2015, Effects of combined silicon and molybdenum alloying on the size and evolution of microalloy precipitates in HSLA steels containing niobium and titanium, Materials characterization, vol. 102, pp. 35-46, doi: 10.1016/j.matchar.2015.02.013.

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Title Effects of combined silicon and molybdenum alloying on the size and evolution of microalloy precipitates in HSLA steels containing niobium and titanium
Author(s) Pavlina, Erik J.
Van Tyne, C. J.
Speer, J. G.
Journal name Materials characterization
Volume number 102
Start page 35
End page 46
Total pages 12
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-04
ISSN 1044-5803
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science, Characterization & Testing
Materials Science
Microalloyed steel
Precipitation
Diffusivity
STRAIN-INDUCED PRECIPITATION
HIGH-STRENGTH
MECHANICAL-PROPERTIES
NB-MO
CARBON
BEHAVIOR
MICROSTRUCTURE
KINETICS
AUSTENITE
CARBIDES
Summary The effects of combined silicon and molybdenum alloying additions on microalloy precipitate formation in austenite after single- and double-step deformations below the austenite no-recrystallization temperature were examined in high-strength low-alloy (HSLA) steels microalloyed with titanium and niobium. The precipitation sequence in austenite was evaluated following an interrupted thermomechanical processing simulation using transmission electron microscopy. Large (~ 105 nm), cuboidal titanium-rich nitride precipitates showed no evolution in size during reheating and simulated thermomechanical processing. The average size and size distribution of these precipitates were also not affected by the combined silicon and molybdenum additions or by deformation. Relatively fine (< 20 nm), irregular-shaped niobium-rich carbonitride precipitates formed in austenite during isothermal holding at 1173 K. Based upon analysis that incorporated precipitate growth and coarsening models, the combined silicon and molybdenum additions were considered to increase the diffusivity of niobium in austenite by over 30% and result in coarser precipitates at 1173 K compared to the lower alloyed steel. Deformation decreased the size of the niobium-rich carbonitride precipitates that formed in austenite.
Language eng
DOI 10.1016/j.matchar.2015.02.013
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30076855

Document type: Journal Article
Collection: Institute for Frontier Materials
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