Microstructure and texture of hot-rolled Cb-Ti and V-Cb microalloyed steels with differences in formability and toughness

Misra, R.D.K.; Tenneti, Kishore; Weatherly, G. C.; Tither, G.

doi:10.1007/s11661-003-0297-4

Cited by 76 publications

(50 citation statements)

References 18 publications

(29 reference statements)

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“…Therefore, some large TiNb-rich particles were also observed in the quenched samples. Similar findings were reported for a variety of Nb-containing thermo-mechanically processed steels [11,[31][32][33][34]. The remaining Ti precipitated as TiC, as found by APT in this work (Fig.…”

Section: Discussionsupporting

confidence: 91%

Effect of deformation temperature on niobium clustering, precipitation and austenite recrystallisation in a Nb–Ti microalloyed steel

Kostryzhev

Shahrani

Zhu

et al. 2013

Materials Science and Engineering: A

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The effect of deformation temperature on Nb solute clustering, precipitation and the kinetics of austenite recrystallisation were studied in a steel containing 0.081C-0.021Ti-0.064 Nb (wt%). Thermo-mechanical processing was carried out using a Gleeble 3500 simulator. The austenite microstructure was studied using a combination of optical microscopy, transmission electron microscopy, and atom probe microscopy, enabling a careful characterisation of grain size, as well as Nb-rich clustering and precipitation processes. A correlation between the austenite recrystallisation kinetics and the chemistry, size and number density of Nb-rich solute atom clusters, and NbTi(C,N) precipitates was established via the austenite deformation temperature. Specifically, we have determined thresholds for the onset of recrystallisation: for deformation levels above 75% and temperatures above 825 °C, Nb atom clusters recrystallisation AbstractThe effect of deformation temperature on Nb solute clustering, precipitation and the kinetics of austenite recrystallisation were studied in a steel containing 0.081C-0.021Ti-0.064Nb (wt. %). Thermo-mechanical processing was carried out using a Gleeble 3500 simulator. The austenite microstructure was studied using a combination of optical microscopy, transmission electron microscopy, and atom probe microscopy, enabling a careful characterisation of grain size, as well as Nb-rich clustering and precipitation processes. A correlation between the austenite recrystallisation kinetics and the chemistry, size and number density of Nb-rich solute atom clusters, and NbTi(C,N) precipitates was established via the austenite deformation temperature. Specifically, we have determined thresholds for the onset of recrystallisation: for deformation levels above 75 % and temperatures above 825 °C, Nb atom clusters < 8 nm effectively suppressed austenite recrystallisation.

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Section: Discussionsupporting

confidence: 91%

Effect of deformation temperature on niobium clustering, precipitation and austenite recrystallisation in a Nb–Ti microalloyed steel

Kostryzhev

Shahrani

Zhu

et al. 2013

Materials Science and Engineering: A

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“…[12] In another example, in a steel containing 0.064C-0.0625Nb-0.0435Ti the grain refinement, solid solution strengthening and work hardening together contributed up to 96 pct to the yield stress, and only 4 pct was the contribution from precipitation strengthening, [13] which could be explained by a lower microalloying element content compared to that in. [12] However, in a steel containing 0.06C-0.08Nb-0.07Ti the grain refinement, solid solution strengthening and work hardening together contributed 67 pct to the yield stress, and the remaining 33 pct was the contribution from precipitation strengthening, [14] which is more than 8 times higher compared to that reported in, [13] although the microalloying element content increased by only 0.044 wt pct. Obviously the variations in steel processing should be taken into account.…”

Section: Introductionmentioning

confidence: 81%

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

Kostryzhev

Marenych

Killmore³

et al. 2015

Metall Mater Trans A

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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. 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.

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“…Especially in the austenite region (900 • C-1300 • C) NbC precipitates formed prevent recrystallization and form small ferrite grains. Niobium and vanadium microalloying elements precipitate as carbide, nitride and carbonitride and contribute to the mechanical properties of microalloyed steels by grain refinement, solid solution precipitation and precipitation hardening mechanisms [17][18][19][20]. Figure 5 shows yield strength (YS), ultimate tensile strength (UTS), elongation and hardness of the examined PM steels.…”

Section: Alloymentioning

confidence: 99%

The Effect of the Sintering Temperature and Addition of Niobium and Vanadium on the Microstructure and Mechanical Properties of Microalloyed PM Steels

Erden

2017

Metals

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In this work, the effect of the sintering temperature on the microstructure and mechanical properties of Nb-V added powder metallurgy (PM) steels was investigated. The microstructure and mechanical properties of the Nb-V added PM microalloyed steel were examined by optical microscopy, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), optical emission spectrometer (OES), tensile and hardness tests. Results indicated that the optimal sintering temperature was 1350 • C and the addition of 0.1%, 0.15% or 0.2% of Nb-V increases the yield strength (YS), ultimate tensile strength (UTS) and hardness of the PM sintered steels. 0.2 wt % Nb-V added PM steel showed the highest values in yield strength (YS), ultimate tensile strength (UTS) and the highest hardness. Elongation also tends to improve with adding Nb-V content. In addition, Nb-V limited grain growth during austenitization.

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Microstructure and texture of hot-rolled Cb-Ti and V-Cb microalloyed steels with differences in formability and toughness

Cited by 76 publications

References 18 publications

Effect of deformation temperature on niobium clustering, precipitation and austenite recrystallisation in a Nb–Ti microalloyed steel

Effect of deformation temperature on niobium clustering, precipitation and austenite recrystallisation in a Nb–Ti microalloyed steel

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

The Effect of the Sintering Temperature and Addition of Niobium and Vanadium on the Microstructure and Mechanical Properties of Microalloyed PM Steels

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