Evolution of Microstructure in a Low-Si Micro-alloyed Steel Processed Through One-Step Quenching and Partitioning

Bansal, Gaurav; Pradeep, M.; Ghosh, Chiradeep; Rajinikanth, V.; Srivastava, V. C.; Bhagat, A. N.; Kundu, Saurabh

doi:10.1007/s11661-018-5039-8

Cited by 26 publications

(11 citation statements)

References 36 publications

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“…As a result, the amount and the size of the carbides will be increased, in comparison to the sample Q&P-treated from lower quench temperatures. [14,28] Moreover, an increase in the retained austenite film thickness with increasing quench temperature was reported by the present authors in the previous study. [11] Therefore, the strength decreased; whereas, the ductility and impact toughness improved with increasing quench temperature.…”

Section: Discussionsupporting

confidence: 83%

“…[7] The M s temperature of the steel was estimated to be 453.6°C using dilatometry experiments. [14] A vacuum induction furnace was used for making the steel at 40 kg scale, which was solidified in a cast-iron mold in the form of an ingot. Small pieces with dimensions as 100 9 100 9 50 mm 3 were cut from the ingot for homogenization at 1200°C for 2 hour followed by hot forging to the size of 220 9 120 9 18 mm 3 using a pneumatic open-die forging hammer.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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“…Si is mainly used to inhibit the precipitation of cementite, while Mn is used to increase austenitic zone, reduce austenitizing temperature, and to strengthen the solid solution [16,17]. In this study, a single-step method is used for partitioning treatment [18]. The temperature of the partitioning process was kept at 350 • C, which was slightly lower than the M s point.…”

Section: Methodsmentioning

confidence: 99%

Enhancing the Mechanical Properties of a Hot Rolled High-Strength Steel Produced by Ultra-Fast Cooling and Q&P Process

Liu

et al. 2019

Metals

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The quenching and partitioning (Q&P) process of advanced high strength steels results in a significant enhancement in their strength and ductility. The development of controlled rolling and cooling technology provides an efficient tool for microstructural design in steels. This approach allows to control phase transformations in order to generate the desired microstructure in steel and, thus, to achieve the required properties. To refine grain structure in a Fe-Si-Mn-Nb steel and to generate the microstructure consisting of martensitic matrix with embedded retained austenite grains, hot rolling and pressing combined with ultrafast cooling and Q&P process is employed. The slender martensite in hot rolled Q&P steel improves the strength of test steel and the flake retained austenite improves the plasticity and work hardening ability through the Transformation Induced Plasticity (TRIP) effect.

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“…Recently, Bansal et al . 18 studied the microstructure evolution of a Al-free 0.5 wt.% Si steel through Q&P process. They confirmed the presence of retained austenite (thin film and blocky morphologies), during partitioning at 330 °C for 2 min, and no cementite precipitation was observed.…”

Section: Introductionmentioning

confidence: 99%

“…They confirmed the presence of retained austenite (thin film and blocky morphologies), during partitioning at 330 °C for 2 min, and no cementite precipitation was observed. The authors state that there are studies available on Q&P treatment in steels with higher Si and/or Al additions (Si + Al = 1 to 1.7 wt.%), but the effect of low Si contents and no Al additions, has not been given due consideration 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Improvement of wear resistance in a pearlitic rail steel via quenching and partitioning processing

Masoumi

Echeverri

Tschiptschin

et al. 2019

Sci Rep

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Improvement of wear resistance and mechanical performance of rails used in heavy-haul railway are essential to reduce railroad maintenance costs. A novel heat treatment based on quenching and partitioning (Q&P) processing was proposed to improve the wear resistance of a hypereutectoid pearlitic rail. 50% of austenite was transformed into martensite under an interrupted quenching from full austenitization temperature to 140 °C. A multiphase microstructure resulted from the quenching and partitioning process, consisting of tempered martensite, bainite, retained austenite, and pearlite colonies. The partitioning step was performed in the range of 350–650 °C. Microstructure characteristics were investigated using scanning electron microscopy, microhardness measurements, X-ray and electron backscattered diffraction. Uniaxial tensile and pin-on-disc tests were also performed to evaluate the mechanical properties and wear resistance. The best combination of wear resistance and mechanical performance was obtained in samples partitioned at 450 and 550 °C, which may be applied in the railway industries.

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Evolution of Microstructure in a Low-Si Micro-alloyed Steel Processed Through One-Step Quenching and Partitioning

Cited by 26 publications

References 36 publications

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Enhancing the Mechanical Properties of a Hot Rolled High-Strength Steel Produced by Ultra-Fast Cooling and Q&P Process

Improvement of wear resistance in a pearlitic rail steel via quenching and partitioning processing

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