Austenite formation and mechanical behavior of a novel TRIP- assisted steel with ferrite/martensite initial structure

Xu, Yujie; Wang, Xu; Liu, Rendong; Peng, Fei; Liu, Hongliang; Misra, R.D.K.; Li, Jiayu; Hou, Xiaoying

doi:10.1016/j.msea.2020.140468

Cited by 20 publications

(5 citation statements)

References 26 publications

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“…[7,8] It was well known that the excellent mechanical properties of third-generation AHSSs are mainly ascribed to the transformation-induced plasticity (TRIP) effect of RA and a superior combination of phases. [9] However, considering the conditions of market industrialization, TRIP and DP steels are still more widely used. [4][5][6][7] Aiming at the development of automobile steel and according to the theory about regulating the phases for AHSSs, which include producing multiphase microstructures, improving the stability of RA, and refining the grain size in steel from micrometer to nanometer, [10,11] it is essential to research the factors affecting the final microstructure characteristics and performance.…”

Section: Introductionmentioning

confidence: 99%

“…[ 7,8 ] It was well known that the excellent mechanical properties of third‐generation AHSSs are mainly ascribed to the transformation‐induced plasticity (TRIP) effect of RA and a superior combination of phases. [ 9 ] However, considering the conditions of market industrialization, TRIP and DP steels are still more widely used. [ 4–7 ]…”

Section: Introductionmentioning

confidence: 99%

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Influence of Initial Structures on the Mechanical Properties in Cold‐Rolled Transformation‐Induced Plasticity Steel

Wang

et al. 2023

steel research int.

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A novel transformation‐induced plasticity steel is analyzed to study the effects of initial structures and the intercritical annealing temperatures on austenization behavior, strain distribution, and the characteristics of retained austenite (RA). The resulting microstructure and its relationship with mechanical properties are measured using dilatometry, scanning electron microscopy, electron backscatter diffraction, X‐ray diffraction, and tensile testing. The results show that the initial structure is composed of martensite (M) or tempered martensite (TM) and can significantly refine the final microstructure and its strain distribution is more homogeneous compared to the ferrite + perlite (F + P) initial structure samples. However, it is found that the larger size of the RA mainly distributes at the ferrite grain boundaries while the smaller size mainly distributes in the bainite matrix and outside martensite. Meanwhile, most of the RA in the bainite matrix are films and the carbon concentration is high. In addition, the initial M samples have many homogeneous lath interfaces and the ferrite has a strong carbon discharge ability during high‐temperature annealing, so the fraction of RA is the highest at 23.1% when annealed at 820 °C, and the corresponding carbon concentration is 1.16 wt%, so the final combination of strength and ductility is up to 32.1 GPa%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Initial Structures on the Mechanical Properties in Cold‐Rolled Transformation‐Induced Plasticity Steel

Wang

et al. 2023

steel research int.

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“…[ 15 ] For quenching and austempering (QAT) treatment with overaging at 400 °C, prequenching increased the yield strength and tensile strength simultaneously, and the total elongation could reach 30%. [ 16 ] During the intercritical annealing, prequenched martensite provides more nucleation sites [ 17 ] and is beneficial to obtain lath‐type structures. [ 18 ] However, few attempts of prior treatment are made to the hot‐galvanized Q&P steel.…”

Section: Introductionmentioning

confidence: 99%

A Novel Process for Hot‐Galvanized Quenching and Partitioning Steel with Excellent Yield–Ductility Synergy by Prior Treatment

Wang

Zhang

et al. 2023

steel research int.

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The present work is aimed at a process to obtain a hot‐galvanized quenching and partitioning (Q&P) steel with excellent yield–ductility synergy by prior treatment. For this purpose, the cold‐rolled sheets with ferrite–pearlite structure are applied to “quenching (Q),” “quenching and tempering (Q&T),” “quenching and austempering (QAT),” and “quenching and austempering followed by tempering (QAT&T)” before the continuous galvanizing line (CGL)‐compatible Q&P treatment. Compared with Q&P sample, Q + Q&P, Q&T + Q&P, QAT + Q&P, and QAT&T + Q&P samples can obtain more homogeneous filmy/lath retained austenite (RA) with an increased C concentration, which can provide the transformation‐induced plasticity (TRIP) effect and improve elongation significantly. The maximum austenite reverse transformation rates are obtained in Q&T and QAT&T samples because of the increased nucleation sites, such as grain boundaries and cementite particles. QAT&T + Q&P sample has the longest plateau region before break and obtains the attractive mechanical properties with a yield strength of 694 MPa, tensile strength of 927 MPa, total elongation of 31.3%, and product of strength and elongation above 29 GPa%.

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“…With the increasing pressure of energy saving and emission reduction in society, the development of high-strength steels is becoming more and more rapid. Hot-formed steels or cold-formed high-strength steels are used to replace low-strength products by reducing the thickness of materials to achieve weight reduction, energy saving, and emission reduction, which has become a common method for the production of "lightweight body-in-white" (BIW) in the automotive industry [1][2][3][4][5][6][7]. When designing the composition of high-strength steel, the carbon content is usually increased.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Mode on the Microstructure of High-Strength Steel during Hot Rolling

Liu¹,

et al. 2022

Metals

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This paper studies the effect of extreme cooling and traditional cooling on the microstructure of high-strength steel during hot rolling by adjusting the cooling process, combining the theoretical calculation and the thermal simulation experiment, and using metallographic microscope, scanning electron microscope (SEM), and electron backscattered diffraction (EBSD) analysis methods in order to solve the problem of coil collapse in the production process of high-strength steel. The research results show that compared with the traditional cooling method, the front-section fast cooling mode can rapidly cool the hot-rolled sheet to the “nose tip” temperature of the ferrite transformation of the time-temperature-phase-transition (TTT) curve, which can promote the transformation of the material to ferrite, increase the proportion of ferrite, and make the grain size of the organization finer. It helps to improve the overall mechanical properties of the material and reduce coil collapse defects. The front-section fast cooling mode achieves good results in industrial application, the proportion of coil collapse reduces from 9.363% to 0.533%, and the problem of coil collapse is significantly improved.

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Austenite formation and mechanical behavior of a novel TRIP- assisted steel with ferrite/martensite initial structure

Cited by 20 publications

References 26 publications

Influence of Initial Structures on the Mechanical Properties in Cold‐Rolled Transformation‐Induced Plasticity Steel

Influence of Initial Structures on the Mechanical Properties in Cold‐Rolled Transformation‐Induced Plasticity Steel

A Novel Process for Hot‐Galvanized Quenching and Partitioning Steel with Excellent Yield–Ductility Synergy by Prior Treatment

Effect of Cooling Mode on the Microstructure of High-Strength Steel during Hot Rolling

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