Fabricating ultrafine grain by advanced thermomechanical processing on low-carbon microalloyed steel

Ba, Li; Liu, Qingyou; Jia, Shujun; Ren, Yi; Wang, Qingqing

doi:10.1016/j.scriptamat.2018.04.028

Cited by 20 publications

(8 citation statements)

References 33 publications

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“…[45] indicate that the fine austenite grains present is more beneficial to the ferrite refinements than the large grains with deformation bands. Okistu et al [46] obtained the submicron ferrite grains of 0.49-0.85 μm with the strain of 2.8 through cold rolling and annealing of 620-655 °C for 120 s. Based on the above results [44][45][46], it is a key to suppress the ferrite grains coarsening for the ultra-fine ferrite grains preparation, it is in accordance with results of Refs. [36,37].…”

Section: Submicron Ferrite Grains Formationsupporting

confidence: 82%

“…By comparison of the grain size and strain with the results reported by Refs. [34,35,[42][43][44], the process proposed by this study has an advantage in respect of ferrite grains refinement with little strain. It may obtain the submicron ferrite within strain about 2.0 through reversal austenization and proper cooling processing.…”

Section: Submicron Ferrite Grains Formationmentioning

confidence: 94%

“…6e, f. It is thought that the deformed UFGF grains may be formed by the DIFT during the second stage [44]. The microstructure which was obtained by quenching immediately after the second stage is composed of martensite (the appearance of martensite can testify the occurrence of DRT) and a little ferrite, as shown in Fig.…”

Section: Submicron Ferrite Grains Formationmentioning

confidence: 98%

“…However, the strain of obtaining UFGF grains by advanced thermo-mechanical processing is less than that of SPD. Li et al [44,45] fabricated the low-carbon microalloyed steel UFGF grains of 1.1 μm during the critical deformation by the strain of 1.0 with the fine austenite grains. And results of Ref.…”

Section: Submicron Ferrite Grains Formationmentioning

confidence: 99%

See 3 more Smart Citations

Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

Chen

Yaqiang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The ultra-fine-grained ferrite (UFGF) with the size of less than 1 μm is often difficult to be obtained for low-alloyed steel in practical production processing. In this study, considering the rod and wire production process, a new method for preparing the UFGF with submicron scale is proposed by warm deformation of six passes with total strain of 2.6, followed by the cooling process in Gleeble-3500 thermo-mechanical simulator. The results show that the UFGF with an average size of 0.64 μm could be obtained via the phase transformation from austenite grains with an average size of 3.4 μm, which are achieved by the deformation-induced reversal austenization during the high strain rate warm deformation. The main driving force for the reversal transformation is the stress. And the interval between the passes also plays an important role in the reversal austenization.

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Section: Submicron Ferrite Grains Formationsupporting

confidence: 82%

Section: Submicron Ferrite Grains Formationmentioning

confidence: 94%

Section: Submicron Ferrite Grains Formationmentioning

confidence: 98%

Section: Submicron Ferrite Grains Formationmentioning

confidence: 99%

See 2 more Smart Citations

Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

Chen

Yaqiang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

show abstract

“…Especially, the DIFT process has been used in the current iron and steel production, due to the excellent practicability. However, the finest grain is about 1.2 µm, produced by deformation-induced ferrite transformation (DIFT), due to the heat released during the high rate cooling process [7]. CRA is a better way to fabricate ultrafine ferrite grains, except for the cost of annealing.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature Scheme on Microstructure and Mechanical Properties during Medium Carbon Steel Warm Processing

Fan

Chen

2019

Metals

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Influence of temperature scheme on the microstructure and properties variation of medium carbon steel warm deformation was studied with testing equipment of Gleeble-3500, SEM, TEM, EBSD, and φ350 reversal rolling mill. The results show that the temperature of 650 facilitates the formation of ultrafine homogeneous microstructure. The microstructure formed during temperature range of 650–700 °C is relative homogeneous and fine. The mechanical properties of warm rolling are influenced by the cooling modes. The lower cooling rate is benefit to the combination of strength and ductility.

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Effect of Hot‐Deformation Processes on Phase Transformation of Low‐Alloyed, Multiphase, High‐Strength Steel

Yan

Wang

et al. 2020

steel research int.

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Low‐alloyed, multiphase, high‐strength steels are strong and tough with good weldabilities and high cost‐to‐performance ratios. They have long‐term research value and broad application prospects. However, there are many types of phase transformations and complicated transformation processes that occur in these steels, which must be studied in detail. Understanding the phase transformations and their relationships to the mechanical properties of steels can theoretically facilitate material property enhancement and support the application and production of such steels. Herein, a Gleeble‐3800 thermosimulation test system is used to simulate the rolling process with different hot‐rolling process parameters. The effects of various parameters, such as the deformation, temperature, and velocity, on the phase‐transformation process and microstructural characteristics of low‐alloyed, multiphase, high‐strength steel are studied under hot deformation and subsequent cooling. The results show that low‐alloyed, multiphase, high‐strength steels generally undergo multiple types of phase transformations in a fixed order. The conditions during hot deformation have a critical influence on the phase transformation, i.e., they change the order of the phase transformations by promoting or suppressing certain phase‐transformation types. This causes different phase‐transformation types to predominate and results in different steel microstructures.

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Fabricating ultrafine grain by advanced thermomechanical processing on low-carbon microalloyed steel

Cited by 20 publications

References 33 publications

Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

Effect of Temperature Scheme on Microstructure and Mechanical Properties during Medium Carbon Steel Warm Processing

Effect of Hot‐Deformation Processes on Phase Transformation of Low‐Alloyed, Multiphase, High‐Strength Steel

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