Boron-treated microalloyed quenched and tempered plates, their structure and properties

Adamczyk, J.; Ozgowicz, W.; Wusatowski, R.; Kalinowska-Ozgowicz, E.; Grzyb, R.

doi:10.1016/s0924-0136(96)02548-4

Cited by 7 publications

(4 citation statements)

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“…Boron steel after hot stamping is a typical ultra-high strength steel. With a uniform martensitic structure, it can have a yield stress of 1200MPa and a tensile stress of 1500MPa (Adamczyk et al, 1997), which is three to four times the strength of the standard deep drawing steel (George et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of boron steel at hot stamping conditions

Sun

Guo

et al. 2016

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of boron steel at hot stamping conditions

Sun

Guo

et al. 2016

Journal of Materials Processing Technology

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“…FRT for 0 Nb and 240 Nb was estimated to be in the region between 880 and 830 °C. Both temperatures are above Ar3 at 758 °C if the equation in [38] is considered as a function of plate thickness. This is also above Ae3 at 811 °C if Thermo-Calc is considered (Figure 3).…”

Section: Thermodynamic Predictionmentioning

confidence: 99%

Hot Deformation Behavior of C-Mn Steel with Incomplete Recrystallization during Roughing Phase with and without Nb Addition

Klančnik¹,

Foder

Bradaškja

et al. 2022

Metals

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The objective of the study is to improve understanding of the practical role of niobium (Nb) in the case of industrial inconsistent rolling processes such as the rolling of heavy gauge plates where a lower stored energy rolling practice will result in a less stable and less repeatable static recrystallization (SRX) activation that prevents complete recrystallization. In the current study, these variabilities are validated by comparing the mean flow stress (MFS) indirectly determined from the rolling force measured on a reverse four-high rolling mill stand. The material resistance to deformation and grain size evolution of a C-Mn steel during hot rolling was observed and validated with and without Nb addition. The pre-defined rolling schedule was predicted to exhibit incomplete recrystallization in the roughing phase due to the limited stored energy of deformation that resulted from low rolling loads and a higher number of rolling passes. The prior austenite grain size (PAGS) distribution was predicted and compared to the measured effective ferrite grain (FG) size distribution after the completion of hot rolling and phase transformation achieved using natural air plate cooling. Both the predicted PAG and measured FG distributions revealed the presence of multimodality, and both distributions were used for grain size reduction factor determination for γ → α transformation for the current study with 1.96 for 0 Nb and 1.70 for 240 Nb. The results presented in this paper are not only limited to the rolling schedule used in this paper because instabilities resulting in incomplete austenite conditioning are also observed when evaluating the cross-sections of other heavy plates and various steel grades utilizing different processing routes with comparable compositions such as modern lean abrasion-resistant steels, regular line pipe steels, and other similar grades.

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“…Hot deformation parameters have a decisive impact on the formation of secondary phases of microadditions that determine the course of dynamic recrystallization and structure refinement in HSLA steels [1,2,39]. Many strategies have been adopted to improve the ductility and impact properties of these ultrahigh-strength DP (Dual Phase) steels, such as refining of microstructure, alloying, or designing new processing methods [6,19,28].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallised Austenite Grains of HSLA Steel

Gnapowski¹,

Opiela²,

Kalinowska-Ozgowicz³

et al. 2020

Adv. Sci. Technol. Res. J.

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Materials scientists are seeking to produce metals with reduced weight and dimensions while maintaining the appropriate mechanical properties. There are several ways to improve the internal structure of metals, such as the ultrasound used to solidify liquid metal. The homogeneity of the grains and the uniformity of the metal structure affects its mechanical strength. This paper presents the results of investigations into the effects of hot deformation parameters in compression on the austenite grain size in the HSLA (High Strength Low Alloy) steel (0.16% C, 0.037% Nb, 0.004% Ti, 0.0098% N). The axisymmetric compression investigations were performed on cylindrical investigation specimens using a Gleeble 3800 thermomechanical simulator with the strain rate of 1÷15.9 s -1 and strain degree ε = 1.2. Before deformation, the research specimens were austenitized at T A = 1100÷1250 °C. The metallographic observations of the primary austenite grains were conducted with an optical microscope, while the structure of dynamically recrystallized austenite, inherited by martensite, was examined by using a scanning electron microscope.

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Boron-treated microalloyed quenched and tempered plates, their structure and properties

Cited by 7 publications

References 0 publications

Experimental investigation of boron steel at hot stamping conditions

Experimental investigation of boron steel at hot stamping conditions

Hot Deformation Behavior of C-Mn Steel with Incomplete Recrystallization during Roughing Phase with and without Nb Addition

The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallised Austenite Grains of HSLA Steel

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