New insights to the effects of ausforming on the bainitic transformation

Hu, Henry; Zurob, Hatem S.; Xu, Guang; Embury, David; Purdy, G.R.

doi:10.1016/j.msea.2014.12.043

Cited by 79 publications

(58 citation statements)

References 26 publications

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“…Homogenized austenite was obtained by heating samples to 900 • C with a heating rate of 10 • C/s and holding for 5 min. At a cooling rate of 30 • C/s, the samples were cooled to the desired temperature (i.e., 300 • C, 350 • C, 400 • C, 450 • C) and held for 2000 s to 16,200 s to subject to bainitic transformation. After heating treatment, samples were quenched to room temperature to avoid the interference of bainite transformed during the cooling process.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…However, the prolonged transformation time hinders its application [12]. A great deal of research has been conducted to understand the effect of ausforming conditions [13][14][15][16], chemical compositions [17], and isothermal temperature [18] on the kinetics and mechanical properties. Obtaining bainitic microstructure is fundamental, and involves the chance to exhibit a good mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

“…Obtaining bainitic microstructure is fundamental, and involves the chance to exhibit a good mechanical performance. Dilatometry is one of the most useful techniques to study the kinetics of bainitic transformation by analyzing the relative change of length due to phase transformation [16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Method to Evaluate the Kinetics of Bainite Transformation in Low-Temperature Nanobainitic Steel Using Thermal Dilatation Curve Analysis

Mao

et al. 2017

Metals

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Abstract:The aim of this work was to develop a method to evaluate the kinetics of bainite transformation by theoretical deduction and thermal dilatation curve analysis. A Gleeble-3500 thermomechanical simulator and dilatometer (DIL805A) were employed to study the isothermal transformation in deformed (360 • C, 600 • C, and 860 • C) and undeformed conditions. The thermal dilatation information during isothermal transformation was recorded, and the dilatation curves were well smoothed. By taking a derivative of the dilation curve with respect to the transformation time, the peak time of transformation rate (PTTR) was obtained, which can serve as the essence of isothermal transformation time. The relative change of length (∆L/L) due to phase transformation was theoretically deduced, and the effect of temperature was taken into consideration. Combing experimental data, the volume fraction of bainite in isothermal transformation was calculated. Making a graph of volume fraction versus PTTR was a good method to evaluate the kinetics of bainitic transformation clearly and concisely which facilitated optimization of the preparation technique for low-temperature nanobainitic steel.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Method to Evaluate the Kinetics of Bainite Transformation in Low-Temperature Nanobainitic Steel Using Thermal Dilatation Curve Analysis

Mao

et al. 2017

Metals

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“…It should be noted that, when the stress exceeds the yield strength of austenite, the prior austenite will be deformed. It was reported that large pre-deformation of austenite hinders the bainitic transformation without stress and causes the mechanical stabilization of austenite [7,9,10]. The present study focuses on the stress below the yield strength of prior austenite.…”

Section: Introductionmentioning

confidence: 97%

The Varying Effects of Uniaxial Compressive Stress on the Bainitic Transformation under Different Austenitization Temperatures

Zhou

Wang

et al. 2016

Metals

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Abstract:In this study, thermal simulation experiments under different austenitization temperatures and different stress states were conducted. High-temperature laser scanning confocal microscopy (LSCM), thermal dilatometry, and scanning electron microscope (SEM) were used to quantitatively investigate the effects of the uniaxial compressive stress on bainitic transformation at 330˝C following different austenitization temperatures. The transformation plasticity was also analyzed. It was found that the promotion degree of stress on bainitic transformation increases with the austenitization temperature due to larger prior austenite grain size as well as stronger promoting effect of mechanical driving force on selected variant growth at higher austenitization temperatures. The grain size and the yield strength of prior austenite are other important factors which influence the promotion degree of stress on bainitic transformation, besides the mechanical driving force provided by the stress. Moreover, the transformation plasticity increases with the austenitization temperature.

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“…[1][2][3][4][5][6][7][8][9] The structure consists mostly of alternating thin plates of bainitic ferrite, a b , and retained austenite, c r , with a small fraction of retained austenite blocks forming the residue of the sample. The austenite films and bainite plates are typically below 50 nm in width, providing a potent strengthening mechanism without compromising toughness.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stable Nanocrystalline Steel

Hulme-Smith

Ooi

Bhadeshia

2017

Metall Mater Trans A

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Two novel nanocrystalline steels were designed to withstand elevated temperatures without catastrophic microstructural changes. In the most successful alloy, a large quantity of nickel was added to stabilize austenite and allow a reduction in the carbon content. A 50 kg cast of the novel alloy was produced and used to verify the formation of nanocrystalline bainite. Synchrotron X-ray diffractometry using in situ heating showed that austenite was able to survive more than 1 hour at 773 K (500°C) and subsequent cooling to ambient temperature. This is the first reported nanocrystalline steel with high-temperature capability.

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New insights to the effects of ausforming on the bainitic transformation

Cited by 79 publications

References 26 publications

Method to Evaluate the Kinetics of Bainite Transformation in Low-Temperature Nanobainitic Steel Using Thermal Dilatation Curve Analysis

Method to Evaluate the Kinetics of Bainite Transformation in Low-Temperature Nanobainitic Steel Using Thermal Dilatation Curve Analysis

The Varying Effects of Uniaxial Compressive Stress on the Bainitic Transformation under Different Austenitization Temperatures

Thermally Stable Nanocrystalline Steel

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