Experimental investigation on segregation and remelting behaviors of boron-containing steel with low carbon

Zhu, Hangyu; Sun, Jinsheng; Wang, Wei; Wang, Weisheng; Lei, Jialiu; Xue, Zhengliang

doi:10.1016/j.rinp.2018.11.059

Cited by 12 publications

(4 citation statements)

References 13 publications

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“…Interdendritic segregation of boron during the solidification of boron‐containing steels and the associated remelting phenomena may lead to surface cracks in continuously cast products . Kapadia et al found that boron contents higher than 0.006 wt% lead to problems during hot working.…”

Section: Manufacturing Of Boron‐alloyed Steelsmentioning

confidence: 99%

Boron in Heat‐Treatable Steels: A Review

Sharma

Ortlepp

Bleck

2019

steel research int.

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The science and technology of boron addition to heat‐treatable steels are explained. The aim is to address the following: How to add boron to steel (i.e., the manufacturing aspects of boron addition to steel)? What precautions are necessary when alloying boron to steel, in terms of composition (mainly nitrogen, aluminum, and titanium contents), processing and heat treatment (i.e., material and process robustness and reproducibility for a consistent steel quality)? Where does boron go in steel (i.e., the state of boron, interstitial or substitutional solute, precipitate or a complex with other alloying elements; as well as the location of boron, i.e., dissolved as a solute in the grain or segregated at the grain boundary)? Which characterization methods are suitable for the detection of the very small amounts of boron (<30 wt ppm) in heat‐treatable steels? What does boron do in steel (i.e., its effect on hardenability and mechanical properties, specifically impact toughness)? How does it do and what it does (i.e., the physical mechanism by which it influences the properties)? How much boron is really required to achieve the desired properties in heat‐treatable steels (i.e., recommendations for the optimum boron content)?

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Section: Manufacturing Of Boron‐alloyed Steelsmentioning

confidence: 99%

Boron in Heat‐Treatable Steels: A Review

Sharma

Ortlepp

Bleck

2019

steel research int.

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“…Although Shen and Li et al investigated the solidification model of steel through experimental methods, these methods are still limited in their ability to obtain real-time information on the formation and evolution of the phase interface during steel solidification. Fortunately, the high-temperature confocal laser scanning microscope (HT-CLSM) equipment [13][14][15][16] can carry out in situ observation experiments on the high-temperature melting and solidification of steel, and record the key information on the structure evolution, temperature, and time of the solidification process in real time, which greatly promotes the study of the solidification characteristics of steel. Shibata et al [7] investigated the peritectic reaction of Fe-C alloy using the HT-CLSM method and found that γ-Fe nucleated and grew at the L and δ-Fe interface.…”

Section: Introductionmentioning

confidence: 99%

In Situ Observation of P91 High‐Alloy Steel Solidification Characteristics at Different Cooling Rates

Wang,

Yang,

Wang

et al. 2023

steel research int.

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To clarify the effect of different radial cooling intensities on the formation of central cracks in large round bloom continuous casting. It is necessary to study the solidification characteristics and dynamics of P91 high alloy steel at different cooling rates to improve the central defects. In this paper, the solidification characteristics of P91 high‐alloyed steel at different cooling rates were studied by the Thermo‐Calc software, high‐temperature laser confocal microscopy, scanning electron microscopy, and optical microscopy. Meanwhile, the growth kinetics of δ‐Fe and γ‐Fe phases under different cooling rates were determined. The results show that the solidification path of P91 high‐alloyed steel is L→(L+δ‐Fe)→(L+γ‐Fe+δ‐Fe)→(δ‐Fe+γ‐Fe). With lower cooling rates (10°C/min), the grains undergo nucleation during the solidification process, then fusion and growth. With higher cooling rates (50°C/min and 100°C/min), the grains grow as dendrites. The δ‐Fe and γ‐Fe phase precipitation process is divided into two stages. Stage I is the nucleation and rapid growth phase, in which a high undercooling is required. Stage II is the slow growth stage, where the undercooling decreases and remains constant. The initial growth linear velocities of the δ‐Fe phase are 0.51, 2.72 and 2.09 µm/s at cooling rates of 10, 50 and 100 °C/min respectively, while those of the γ‐Fe phase are 0.10, 1.42 and 1.41 µm/s.This article is protected by copyright. All rights reserved.

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“…Accordingly, orientation (relative to the principle direction of working), location (related to segregations originating from the solidification process) and preparation (cutting, machining and heat treatment) of these test pieces are essential. On the other hand, the basis for typical steel tensile strength prediction is its chemical composition [4][5][6][7], but contemporary models also involve solidification influences, including grain size and morphology [8][9][10], microstructure [8][9][10][11][12][13][14][15][16][17], macrostructure [8,10,12,15,18,19], chemical non-homogeneities segregations [6,7,[19][20][21][22][23] and casting defects [24,25]. The tensile strength researches are related mostly with individual steel grades, but also more general prediction models were developed [5,14,26].…”

Section: Introductionmentioning

confidence: 99%

“…Hangyu et al [21] observed the remelting of the crack vicinity of continuously cast low carbon boron steel. A high temperature confocal laser scanning microscope was used for remelting.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Continuous Casting Process of Hypoeutectoid Steel Grades Using Multiple Linear Regression and Genetic Programming—An Industrial Study

Brezočnik

Župerl

2021

Metals

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Štore Steel Ltd. is one of the major flat spring steel producers in Europe. Until 2016 the company used a three-strand continuous casting machine with 6 m radius, when it was replaced by a completely new two-strand continuous caster with 9 m radius. For the comparison of the tensile strength of 41 hypoeutectoid steel grades, we conducted 1847 tensile strength tests during the first period of testing using the old continuous caster, and 713 tensile strength tests during the second period of testing using the new continuous caster. It was found that for 11 steel grades the tensile strength of the rolled material was statistically significantly lower (t-test method) in the period of using the new continuous caster, whereas all other steel grades remained the same. To improve the new continuous casting process, we decided to study the process in more detail using the Multiple Linear Regression method and the Genetic Programming approach based on 713 items of empirical data obtained on the new continuous casting machine. Based on the obtained models of the new continuous casting process, we determined the most influential parameters on the tensile strength of a product. According to the model’s analysis, the secondary cooling at the new continuous caster was improved with the installation of a self-cleaning filter in 2019. After implementing this modification, we performed an additional 794 tensile tests during the third period of testing. It was found out that, after installation of the self-cleaning filter, in 6 steel grades out of 19, the tensile strength in rolled condition improved statistically significantly, whereas all the other steel grades remained the same.

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Experimental investigation on segregation and remelting behaviors of boron-containing steel with low carbon

Cited by 12 publications

References 13 publications

Boron in Heat‐Treatable Steels: A Review

Boron in Heat‐Treatable Steels: A Review

In Situ Observation of P91 High‐Alloy Steel Solidification Characteristics at Different Cooling Rates

Optimization of the Continuous Casting Process of Hypoeutectoid Steel Grades Using Multiple Linear Regression and Genetic Programming—An Industrial Study

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