An investigation of plastic deformation behaviour of Nb-V microalloyed steel produced by powder metallurgy
J. Min. Metall. Sect. B-Metall., 60 (3) (2024) 305-315. DOI:10.2298/JMMB231226025T
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Available online 20 novembar 2024
(Received 26 December 2023; Accepted 28 October 2024)
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In this study, microalloyed Nb-V steel was produced and sintered at 1150 °C for 1 h followed by cooling in furnace. While one of the sintered samples was used in the sintered state, the other was air cooled at 1150 °C for 1 hour after homogenization heat treatment. The remaining samples were deformed at 20%, 40% and 60% in the temperature range of 1150-930 °C and then cooled in air. The microstructure and the formation of precipitates in the samples were investigated using an optic microscope, scanning electron microscope and energy dispersive spectroscopy analyses. It was found that the samples under homogenized and 20%, 40% or 60% deformed conditions had a smaller grain size but higher volume fractions of ferrite. This indicates that grain refinement and ferrite formation are accelerated by the deformation which affects the nucleation rate of the ferrite. The yield strength, hardness and density also increased with increasing deformation rate.
Keywords: Microalloyed steels; Powder metallurgy; Thermomechanical processing; Microstructure and mechanical properties
Correspondence Address:
S. Gündüz,
Karabük University, Technology Faculty, Karabük, Türkiye;
email: sgunduz@karabuk.edu.tr
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