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Strengthening mechanisms in thermomechanically processed NbTi-microalloyed steel

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posted on 2024-11-16, 09:04 authored by Andrii Kostryzhev, Olexandra Marenych, Chris R Killmore, Elena PerelomaElena Pereloma
The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075 °C to 825 °C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly.

Funding

New insights on the role of microalloying in high strength steels

Australian Research Council

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A 200 keV Analytical Transmission Electron Microscope

Australian Research Council

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An analytical field emission gun scanning electron microscope

Australian Research Council

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History

Citation

Kostryzhev, A. G., Marenych, O. O., Killmore, C. R. & Pereloma, E. V. (2015). Strengthening mechanisms in thermomechanically processed NbTi-microalloyed steel. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 46 (8), 3470-3480.

Journal title

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

46

Issue

8

Pagination

3470-3480

Language

English

RIS ID

101237

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