Enhanced Thermal Stability of the Low‐Carbon Ultrafine Grain Steel with Nanoprecipitates

Zhang, Qingxiao; Yuan, Qing; Wang, Zhoutou; Qiao, Wenwei; Xu, Guang

doi:10.1002/srin.202100320

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…It has been found that the addition of 0.028 wt% of niobium to ultrafine grain low carbon steel leads to a significant increase in strength without decreasing ductility [13]. In addition, niobium improves the thermal stability of ultrafine grain low carbon steel [14]. Although creating of ultrafine grain structure in low carbon steel increases the strength, it reduces the work hardening rate and uniform elongation.…”

Section: Introductionmentioning

confidence: 99%

“…Such a structure has the suitable combination of strength-ductility. Electropulsing of ultrafine grain low carbon steel also leads to the formation of a structure with a bimodal grain size distribution in the ferrite, which can significantly recover the ductility of steel [14]. Ductility is recovered DOI: 10.36547/ams.29.…”

Section: Introductionmentioning

confidence: 99%

“…1.1709 due to the formation of micron-sized ferrite grain and a significant reduction in dislocation density. Coarsening of ultrafine grains into micron-sized grains occurs by the electromigration of high-angle grain boundaries [14]. The bimodal grain structure in low carbon steel was fabricated via deforming martensite starting structure by plane strain compression and then shorttime annealing at high temperatures [17].…”

Section: Introductionmentioning

confidence: 99%

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improvement of tensile properties of low-carbon steels via short-time intercritical annealing

Mohsenzadeh

2023

Acta Metall Slovaca

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The effect of low volume fraction formation of martensite on the tensile properties of low carbon steel was evaluated. First, steel samples with ferrite-cementite microstructure were produced. The thermomechanical treatment used included austenitizing at 1000 °C and then quenching in ice brine solution, tempering the obtained martensitic structure for 1 h at 650 °C, 80% cold rolling, and re-tempering for 2 h at 650 °C. In order to form a low volume fraction of martensite, steel samples with ferrite-cementite microstructure were intercritically annealed for 30 seconds at 740 °C. As a result of intercritical annealing treatment, 6.2% martensite was formed. The results of tensile test showed that the formation of 6.2% martensite led to the elimination of yield point phenomenon and Lüders banding, decrease of yield stress and increase of true stress at maximum load, while true uniform strain did not change significantly. The work hardening rate also increased significantly. Based on the results of modeling of the flow behavior with the Holloman equation, the work hardening capability of the steel sample including ferrite-cementite decreased after a certain plastic strain, while the work hardening capacity remained constant with the formation of a low volume fraction of martensite in the microstructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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improvement of tensile properties of low-carbon steels via short-time intercritical annealing

Mohsenzadeh

2023

Acta Metall Slovaca

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Effect of layered heterogeneous microstructure design on the mechanical behavior of medium carbon steel

Feng

et al. 2022

Materials & Design

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Role of Precipitates on the Grain Coarsening of 20CrMnTi Gear Steel during Pseudo-Carburizing

Zhang¹,

Yuan

Tang³

et al. 2023

Metals

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The carburizing period for tool steel could be significantly shortened by operating at a higher carburizing temperature. However, grain coarsening happens during the carburizing process, and then results in the deteriorated surface properties in 20CrMnTi gear steel, especially at an elevated carburizing temperature. The relationships between grain coarsening and the precipitates in the developed 20CrMnTi gear steel during pseudo-carburizing were established by microstructure characterization, precipitate analysis and in-situ observation to clarify the coarsening mechanism. The results manifested the Baker–Nutting orientation relationship between the (Ti, Mo)(C, N) particles and the matrix, and then testified to the redissolution and ripening of the (Ti, Mo)(C, N) precipitates pre-formed in the α phase during the carburizing. Coarsening in austenite grain during the carburizing process was mainly caused by the rapid redissolution and ripening of the (Ti, Mo)(C, N) precipitates, although this occurred in a very short pseudo-carburizing time. The area density of the dispersed unripe (Ti, Mo)(C, N) particles markedly decreased from 0.389% in as-hot rolled gear steel to 0.341%, and then from 0.279% in carburized steels at 970 and 980 °C, respectively. Additionally, the redissolution and ripening of the (Ti, Mo)(C, N) precipitates were accelerated by the elevated carburizing temperature of 980 °C, at which time the growing rate in austenite grains was 2.34 μm/min during the prior 1 min (0.79 μm/min during the prior 3 min at 970 °C). The temperature then decreased to 0.003 μm/min in the subsequent carburizing process. The results obtained our current work reflected that the particles with excellent thermal stability should play important roles in the limitation of grain coarsening during the carburizing process.

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Enhanced Thermal Stability of the Low‐Carbon Ultrafine Grain Steel with Nanoprecipitates

Cited by 3 publications

References 38 publications

improvement of tensile properties of low-carbon steels via short-time intercritical annealing

improvement of tensile properties of low-carbon steels via short-time intercritical annealing

Effect of layered heterogeneous microstructure design on the mechanical behavior of medium carbon steel

Role of Precipitates on the Grain Coarsening of 20CrMnTi Gear Steel during Pseudo-Carburizing

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