Influence of Boron on transformation behavior during continuous cooling of low alloyed steels

Terzić, Anja; Calcagnotto, M.; Guk, Sergey; Schulz, T.; Kawalla, Rudolf

doi:10.1016/j.msea.2013.07.010

Cited by 27 publications

(23 citation statements)

References 10 publications

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“…Si is an element that accelerates the beginning of ferritic transformation, thus increasing the start and end temperatures of austenite decomposition 31 . However, the increase in Mn and B contents causes a downward displacement of the austenite decomposition start and end temperatures, that is, these elements tend to stabilize the austenite at lower temperatures 28,[38][39][40][41] . In this context, the combined effect of the B, Mn, and Si contents would be the main responsible for the behavior of the steel CCT diagrams in the different positions.…”

Section: Dilatometrymentioning

confidence: 99%

Effect of the Chemical Homogeneity of a Quenched and Tempered C-Mn Steel Pipe on the Mechanical Properties and Phase Transformations

et al. 2019

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Seamless steel pipes for application in the oil and gas industries are manufactured from quenched and tempered steel. Aiming to meet the required characteristics, it is necessary that the microstructure and the mechanical properties are homogeneous along the wall thickness of the pipes, which is even more critical for thick wall pipes. Considering the seamless steel pipe manufacturing process, any chemical segregation along the thickness could affect the phase transformation kinetics during heat treatments and, consequently, microstructure and mechanical properties. In this context, this pioneer work when evaluating the effect of the chemical homogeneity of a seamless pipe on the mechanical properties and phase transformations. The studied pipe was manufactured by a C-Mn steel designed for oil and gas industry applications. Two regions of the pipe wall were analyzed-a region close to the inner surface and another near the outer surface. The steel was subjected to quenching and tempering heat treatments. Scanning electron and optical microscopy techniques were used to characterize the resultant microstructures. Microhardness and Charpy impact tests were performed aiming to analyze the pipe mechanical behavior in the studied regions. In addition, dilatometric tests were performed in order to determine the continuous cooling transformation diagrams of these regions.

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Section: Dilatometrymentioning

confidence: 99%

Effect of the Chemical Homogeneity of a Quenched and Tempered C-Mn Steel Pipe on the Mechanical Properties and Phase Transformations

et al. 2019

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“…The development of low-cost high-performance microalloyed steel is one of the important research fields of steel. In the research works on the high-strength high-toughness steels, the addition of boron to microalloyed steel with Ti, V and Nb has been widely used to improve the mechanical properties of steel [1,2]. Boron is regarded as one of the most effective elements to realize the transformation strengthening in the steel [3].…”

Section: Introductionmentioning

confidence: 99%

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

Kim¹,

Choe³

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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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.

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“…The optimum content of boron to maximize the hardening effect in steel is in the range of 10 to 30 ppm. Outside this range, the hardening effect of boron disappears [ 5 ]. The effectiveness of boron depends on the addition of strong nitride formers, such as Ti, to prevent boron nitride formation [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Titanium and Boron Microalloying on Sulfide Stress Cracking in C110 Casing Steel

Zhang

Liu

2020

Materials

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The effect of Ti and B microalloying on the hardenability, prior austenite grain size (PAGS), mechanical properties, and sulfide stress cracking (SSC) of C110 grade steel was studied by Jominy testing, static tensile testing, an optical microscope (OM), scanning electron microscopy (SEM) and double cantilever beam (DCB) testing. The results show that the addition of 0.015% Ti and 0.002% B into a medium-carbon Fe-Cr-Mo-Nb-V steel increased the hardenability and refined the PAGS and quenched martensite packets, and the size of carbides was reduced. It is believed that these behaviors are responsible for the improvement in the threshold stress intensity factor KISSC.

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Influence of Boron on transformation behavior during continuous cooling of low alloyed steels

Cited by 27 publications

References 10 publications

Effect of the Chemical Homogeneity of a Quenched and Tempered C-Mn Steel Pipe on the Mechanical Properties and Phase Transformations

Effect of the Chemical Homogeneity of a Quenched and Tempered C-Mn Steel Pipe on the Mechanical Properties and Phase Transformations

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

Effect of Titanium and Boron Microalloying on Sulfide Stress Cracking in C110 Casing Steel

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