Microstructure evolution and carbide precipitation behavior of microalloyed TS800TB steel during hot rolling and coiling processes

Zheng, Yaxu; Wang, Qi; Zhu, Lingkai; Han, Baochen; Guo, Zhihong; Wang, Bo; Feng, Jie; Lu, Su-ling; Shen, Wei; Cao, Ruifang

doi:10.1016/j.msea.2022.142902

Cited by 19 publications

(7 citation statements)

References 53 publications

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“…The k y value of the steel materials was between 14.0 Mpa and 23.4 MPa mm 1/2 , and that of the medium‐carbon steel was 20.6 MPa mm 1/2 . [ 31,35,36 ] The σ gb values of the base and Cr–Mo steels were 236 and 302 MPa, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The k y value of the steel materials was between 14.0 Mpa and 23.4 MPa mm 1/2 , and that of the medium-carbon steel was 20.6 MPa mm 1/2 . [31,35,36] The σ gb values of the base and Cr-Mo steels were 236 and 302 MPa, respectively. Dislocations interact with each other when they move, consequently hindering the dislocation movement and making it difficult to continue the plastic deformation.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

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Effect of Cr–Mo Addition on the Microstructure and Mechanical Properties of Medium‐Carbon Steel

Qi,

Wu,

et al. 2023

steel research int.

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Herein, the effects of Cr–Mo addition on the microstructural evolution and mechanical properties of medium‐carbon steel after spheroidization annealing are systematically studied through scanning electron microscopy, electron backscatter diffraction, and tensile testing. Cr–Mo addition hinders the proeutectoid ferrite + pearlite transformation, thereby promoting the bainite transformation. Moreover, it refines the pearlite lamellar spacing as well as decreases the average carbide diameter, increases the number of carbides per unit area, and hinders ferrite recrystallization. Compared with those in the B1 steel annealed for 8 h, the size of carbides and their number per unit area in the CM1 steel are 30% lower and 2.2‐fold higher, respectively. Due to finer ferrite grains, smaller carbides, and a higher amount of carbides, the strength of steel improves, and the plasticity slightly reduces after Cr–Mo addition. After 2 h of annealing, the yield strengths of Cr–Mo steels are 77.5–109.5 MPa higher than those of base steels; the elongations are above 20%. The contributions of the strengthening mechanism of steel to the yield strength are as follows (from high to low): grain boundary, precipitation, solid solution, and dislocation strengthening.

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Section: Resultsmentioning

confidence: 99%

Section: Strengthening Mechanismsmentioning

confidence: 99%

Effect of Cr–Mo Addition on the Microstructure and Mechanical Properties of Medium‐Carbon Steel

Qi,

Wu,

et al. 2023

steel research int.

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“…The last rolling passes were performed at low temperatures of 700-720 • C under TMCP, inhibiting the dynamic and metadynamic recrystallization [44]. Additionally, this temperature range refers to the precipitation of fine V/Nb carbides [45], contributing to recrystallization suppression [46]. Subsequently, the structure acquired a heavily deformed pattern with a high dislocation density.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Zurnadzhy,

Stavrovskaia,

Chabak

et al. 2024

Materials

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Structural rolled steels are the primary products of modern ferrous metallurgy. Consequently, enhancing the mechanical properties of rolled steel using energy-saving processing routes without furnace heating for additional heat treatment is advisable. This study compared the effect on the mechanical properties of structural steel for different processing routes, like conventional hot rolling, normalizing rolling, thermo-mechanically controlled processing (TMCP), and TMCP with accelerating cooling (AC) to 550 °C or 460 °C. The material studied was a 20 mm-thick sheet of S355N grade (EN 10025) made of low-carbon (V+Nb+Al)-micro-alloyed steel. The research methodology included standard mechanical testing and microstructure characterization using optical microscopy, scanning and transmission electronic microscopies, energy dispersive X-ray spectrometry, and X-ray diffraction. It was found that using different processing routes could increase the mechanical properties of the steel sheets from S355N to S550QL1 grade without additional heat treatment costs. TMCP followed by AC to 550 °C ensured the best combination of strength and cold-temperature resistance due to formation of a quasi-polygonal/acicular ferrite structure with minor fractions of dispersed pearlite and martensite/austenite islands. The contribution of different structural factors to the yield tensile strength and ductile–brittle transition temperature of steel was analyzed using theoretical calculations. The calculated results complied well with the experimental data. The effectiveness of the cost-saving processing routes which may bring definite economic benefits is concluded.

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“…But according to the precipitation strengthening mechanism [5], the strengthening effect of micro alloyed carbon and nitride particles is produced by pinning grain boundaries. It is generally believed that precipitation strengthening occurs in the micro alloy composition system [6], but the research [7][8] shows that in carbon steel, by controlling the precipitation size of cementite particles, obvious strengthening effect can also be produced.…”

Section: Hardness and Cementite Precipitationmentioning

confidence: 99%

Effect of SCM435 initial microstructure and annealing process on spheroidization grade and properties

Zhu¹,

Zhen²,

Wang³

et al. 2023

Vib. proced.

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In order to research the evolution of microstructures and properties of SCM435 wire rod after annealing with different initial structures, two kinds of initial microstructure (B+M and F+P) SCM435 wire rods were used to simulate spheroidizing annealing, softening annealing and stress relief annealing processes respectively. The results show that under the same process conditions, the spheroidization grade of B+M was 1-2 higher than that of F+P, while the hardness does not decrease with the increase of spheroidization grade. The analysis indicated that precipitation strengthening occurs not only in the micro alloy composition system, but also in carbon steel. By control the size and amount of cementite precipitation particles, obvious strengthening effect can also be produced. Besides, after high-temperature annealing, low spheroidization grade sample has more massive ferrite and concentrated cementite, causing the hardness decreasing. In addition, the differences between the simulation process and the industrial production process are analyzed to provide guidance for formulating annealing process of different enterprises and equipment.

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Microstructure evolution and carbide precipitation behavior of microalloyed TS800TB steel during hot rolling and coiling processes

Cited by 19 publications

References 53 publications

Effect of Cr–Mo Addition on the Microstructure and Mechanical Properties of Medium‐Carbon Steel

Effect of Cr–Mo Addition on the Microstructure and Mechanical Properties of Medium‐Carbon Steel

Enhancing the Tensile Properties and Ductile-Brittle Transition Behavior of the EN S355 Grade Rolled Steel via Cost-Saving Processing Routes

Effect of SCM435 initial microstructure and annealing process on spheroidization grade and properties

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