Influence of Vanadium Content on Hot Deformation Behavior of Low-Carbon Boron Microalloyed Steel

doi:10.1007/s40195-020-01005-3

摘要/Abstract

Abstract:

Single-pass compression tests were performed to investigate the hot deformation behavior of low-carbon boron microalloyed steel containing three various vanadium contents at 900-1100 °C and strain rate of 0.01-10 s^-1 using the MMS-300 thermal mechanical simulator. The flow stress curves of investigated steels were obtained under the different deformation conditions, and the effects of the deformation temperature and strain rate on the flow stress were discussed. The characteristic points of flow stress were obtained from the stress dependence of strain hardening rate; the activation energy of investigated steels was determined by the regression analysis; the flow stress constitutive equations were developed; the effect of vanadium content on the flow stress and dynamic recrystallization (DRX) was investigated. The result showed that the flow stress and activation energy (316.5 kJ mol^-1) of the steel containing 0.18 wt% V were significantly higher than those of the steels with 0.042 wt% and 0.086 wt% V, which was related to the increase in solute drag and precipitation effects for higher vanadium content. DRX analysis showed that the addition of vanadium can delay the initiation and the rate of DRX.

Key words: Boron microalloyed steel, Vanadium, Flow stress, Hot deformation, Dynamic recrystallization

. [J]. 金属学报英文版, 2020, 33(5): 705-715.

Kwang-Su Kim, Lin-Xiu Du, Hyo-sung Choe, Tae-Hyong Lee, Gyong-Chol Lee. Influence of Vanadium Content on Hot Deformation Behavior of Low-Carbon Boron Microalloyed Steel[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(5): 705-715.

图/表 14

Table 1 Chemical composition of the experimental steels (wt%)

Fig. 1 Stress-strain curves of experimental steels at different temperatures and strain rates

Fig. 2 Strain hardening rate (θ) versus flow stress (σ) at strain rate of 0.1 s-1 and different deformation temperatures: a V1 steel; b V2 steel; c V3 steel

Fig. 3 - (dθ/dσ)-σ curves at strain rate of 0.1 s-1 and different temperatures: a V1 steel; b V2 steel; c V3 steel

Fig. 4 Relationship between critical DRX parameters and deformation temperatures at strain rate of 0.01 s-1: a peak stress; b critical stress; c peak strain; d critical strain

Fig. 5 Variation in residual sum of squares (RSS) of n with the value of α for V1 steel

Fig. 6 Relationship among strain rate, deformation temperature and peak stress for V1 steel: a ln[sinh(ασp)]-$\ln \dot{\varepsilon }$; b ln[sinh(ασp)]-104/T

Fig. 7 Relationship between Z and $\ln [\sinh (\alpha \sigma_{\text{p}} )]$ for V1 steel

Fig. 8 Optical microstructures of V1 and V3 steels deformed at 950 °C, 0.01 s-1: a V1 steel; b V3 steel

Fig. 9 TEM micrograph and EDX analysis of precipitates in V3 steel: a morphology of precipitates; b EDX analysis result of precipitate

Fig. 10 Relationship between characteristic points: aσp and σc; bεp and εc

Fig. 11 Relationship between $\ln [\ln (1/(1 - X))]$ and $\ln [(\varepsilon - \varepsilon_{\text{c}} )/\varepsilon_{\text{p}} )]$ under different deformation conditions: a V1 steel; b V2 steel; c V3 steel

Fig. 12 DRX volume fraction at strain rate of 0.01 s-1 and different deformation temperatures for V1 steel a; kinetics of DRX for three experiment steels under the same deformation condition (950 °C, 0.1 s-1) b

Fig. 13 Optical microstructures of three experimental steels deformed at 950 °C, 0.1 s-1: a V1 steel; b V2 steel; c V3 steel

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