Microstructure and partitioning behavior characteristics in low carbon steels treated by hot-rolling direct quenching and dynamical partitioning processes

Li, Y.J.; Li, Xiaolei; Yuan, Guo; Kang, Jian; Chen, Dong; Guo-dong, Wang

doi:10.1016/j.matchar.2016.10.005

Cited by 46 publications

(20 citation statements)

References 27 publications

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“…In the literature, there were only a few papers dealing with the direct quenching and partitioning (DQP) process, despite their promising strength and ductility combinations. In addition to Tsukatani et al [12], Thomas et al [5], Somani et al [8], Li et al [15] and Tan et al [16] described DQP-type processes. The treatment presented by Tsukatani et al [12] is not a DQP process but is very similar.…”

Section: Introductionmentioning

confidence: 99%

“…Thomas et al [5] proposed a DQP rolling process based on Gleeble thermal simulations, but no actual rolling treatments were studied. Li et al [15] and Tan et al [16] used different rolling schedules, cooling rates, quenching stop temperatures (TQ) and coiling times compared to those used in the current TMR-DQP process. In the present study actual laboratory hot rolling experiments were conducted.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization and Mechanical Properties of Direct Quenched and Partitioned High-Aluminum and High-Silicon Steels

Kantanen

Somani

Kaijalainen

et al. 2019

Metals

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A new experimental steel containing in weight percent 0.3C-2.0Mn-0.5Si-1.0Al-2.2Cr and 0.3C-1.9Mn-1.0Si-1.0Cr was hot rolled in a laboratory rolling mill and directly quenched within the martensite start and finish temperature range. It was then partitioned without reheating during slow furnace cooling to achieve tensile yield strengths over 1100 MPa with good combinations of strength, ductility and impact toughness. Gleeble thermomechanical simulations led to the selection of the partitioning at the temperatures 175 and 225 °C, which produced the desired microstructures of lath martensite with finely divided retained austenite in fractions of 6.5% and 10% respectively. The microstructures were analyzed using light and scanning electron microscopy in combination with electron backscatter diffraction and X-ray diffraction analysis. The mechanical properties were characterized extensively using hardness, tensile and Charpy V impact testing. In tensile testing a transformation induced plasticity mechanism was shown to operate with the less stable, carbon-poorer retained austenite, which transformed to martensite during straining. The auspicious results in respect to microstructures and mechanical properties indicate that there are possibilities for developing tough ductile structural steels through thermomechanical rolling followed by the direct quenching and partitioning route.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Mechanical Properties of Direct Quenched and Partitioned High-Aluminum and High-Silicon Steels

Kantanen

Somani

Kaijalainen

et al. 2019

Metals

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“…THE steels treated by an energy-efficient quenching and nonisothermal partitioning (Q&P) process [1][2][3][4][5][6][7][8][9][10][11][12] show stabilization of the austenite between the martensitic laths. In this process, the steel is austenitized, hot-rolled, quenched to a temperature between M s and M f and coiled.…”

Section: Introductionmentioning

confidence: 99%

“…During this cooling step, carbon diffuses from martensite to the remaining austenite and the precipitation of carbides takes place. [1,[4][5][6][7][8][9][10][11][12] Depending upon the extent of carbon enrichment of the remaining austenite, it may fully be retained at the room temperature or may partially transform to secondary martensite and/or bainite. [6][7][8][9]11,12] In some of the studies, [1][2][3][4] the effect of nonisothermal partitioning on the microstructure evolution and/or tensile properties of steel has been found to be comparable to that obtained by conventional isothermal partitioning process.…”

Section: Introductionmentioning

confidence: 99%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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The present study demonstrates the role of hot rolling and quench temperature in determining the mechanical properties of low alloy steel processed through quenching and nonisothermal partitioning (Q&P) route. The results indicate that the abrasive wear resistance does not show any significant variation with quench temperature. However, a reduction in tensile strength and an increase in charpy impact toughness and elongation is observed with increasing quench temperature. Interestingly, the retained austenite shows high thermal stability at sub-zero temperature. Furthermore, during deformation through the wear process, the retained austenite experiences the TRIP effect that leads to improvement in wear resistance. The incorporation of hot rolling prior to Q&P led to a significant improvement in strength, energy absorption capability and wear resistance due to a considerable refinement of the microstructural constituents.

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“…The deformation ability of the martensite during uniform deformation stage is improved effectively, resulting in improvement of the ductility obviously. In addition, the film-like retained austenite between martensite is more stable than massive retained austenite as mentioned in previous literatures [ 43 , 44 ]. The deformation-induced martensite transformation from the unstable massive retained austenite would occur when the critical stress caused by the high density of the dislocation in some areas reach a certain critical value and lead to the Transformation Induced Plasticity (TRIP) effect.…”

Section: Discussionmentioning

confidence: 60%

Improvement of Strength-Toughness-Hardness Balance in Large Cross-Section 718H Pre-Hardened Mold Steel

Liu

et al. 2018

Materials

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The strength-toughness combination and hardness uniformity in large cross-section 718H pre-hardened mold steel from a 20 ton ingot were investigated with three different heat treatments for industrial applications. The different microstructures, including tempered martensite, lower bainite, and retained austenite, were obtained at equivalent hardness. The microstructures were characterized by using metallographic observations, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and electron back-scattered diffraction (EBSD). The mechanical properties were compared by tensile, Charpy U-notch impact and hardness uniformity tests at room temperature. The results showed that the test steels after normalizing-quenching-tempering (N-QT) possessed the best strength-toughness combination and hardness uniformity compared with the conventional quenched-tempered (QT) steel. In addition, the test steel after austempering-tempering (A-T) demonstrated the worse hardness uniformity and lower yield strength while possessing relatively higher elongation (17%) compared with the samples after N-QT (14.5%) treatments. The better ductility of A-T steel mainly depended on the amount and morphology of retained austenite and thermal/deformation-induced twined martensite. This work elucidates the mechanisms of microstructure evolution during heat treatments and will highly improve the strength-toughness-hardness trade-off in large cross-section steels.

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Microstructure and partitioning behavior characteristics in low carbon steels treated by hot-rolling direct quenching and dynamical partitioning processes

Cited by 46 publications

References 27 publications

Microstructural Characterization and Mechanical Properties of Direct Quenched and Partitioned High-Aluminum and High-Silicon Steels

Microstructural Characterization and Mechanical Properties of Direct Quenched and Partitioned High-Aluminum and High-Silicon Steels

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Improvement of Strength-Toughness-Hardness Balance in Large Cross-Section 718H Pre-Hardened Mold Steel

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