Modeling the role of external stresses on the austenite-to-bainite phase transformation in 51CrV4 steel

Uslu, M. C.; Canadinç, D.; Lambers, H.-G.; Tschumak, S.; Maier, Hans Jürgen

doi:10.1088/0965-0393/19/4/045007

Cited by 16 publications

(8 citation statements)

References 35 publications

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“…In addition, for Greenwood-Johnson mechanism, the TP strain is associated with the micro-deformation of the weaker phase because the volume between the parent and the product phases is different [21,22]. Rees et al and Uslu et al [17,23] believed that Magee mechanism is suitable to explain the occurrence of TP strain in bainite steels, whereas Han et al and Liu et al [24,25] proposed TP strain models based on Greenwood-Johnson mechanism. It is meaningful to investigate the mechanisms for the occurrence of TP strain in the bainite steel.…”

Section: Introductionmentioning

confidence: 99%

Effects of Plastic Stress on Transformation Plasticity and Microstructure of a Carbide-Free Bainite Steel

Liu

et al. 2019

Metallogr. Microstruct. Anal.

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Thermal simulation experiments were conducted, the microstructures were observed by scanning electron microscope (SEM) and transmission electron microscopy (TEM), and the bainite orientation was examined by electron backscattering diffraction (EBSD). The effects of plastic stress on transformation plasticity (TP) strain were investigated. The results show that the TP strain increases nonlinearly with the applied stress. It increases slowly versus the stress in the elastic region, and there is a sharp increase in TP strain if the stress exceeds the parent austenite yield strength because of the combined effect of prior deformation and stress. As the stress continues to increase, the bainite transformation amount decreases, leading to a slower increasing rate of TP strain. In addition, it is confirmed by EBSD that the TP strain is accompanied by the variant selection in microstructures, so that the occurrence of TP is consistent with the Magee mechanism. Moreover, the TP strain is more obvious at lower transformation temperatures due to the increased bainite transformation amount and more organized bainite structure.

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Section: Introductionmentioning

confidence: 99%

Effects of Plastic Stress on Transformation Plasticity and Microstructure of a Carbide-Free Bainite Steel

Liu

et al. 2019

Metallogr. Microstruct. Anal.

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“…The bainitic variants complying with the stress are promoted, while others are not. Therefore, variant selection occurs under the effect of stress, which has been confirmed in many studies [2,3,[26][27][28]. In this case, the shear strain of the IPS does not cancel out and TP strain is detected.…”

Section: Tp Strainmentioning

confidence: 66%

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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“…Bainitic transformation is affected by stress. Hence, many studies have been conducted on the effect of external stress on bainitic transformation in recent years . For example, Matsuzaki et al investigated the effects of stress on the bainite reaction in a Fe 0.12 C 2.03 Si 2.96 Mn (wt%) bainitic steel.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Stress on Bainite Transformation, Microstructure, and Properties of a Low‐Carbon Bainitic Steel

Liu

Tian

et al. 2019

steel research int.

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The effects of applying external stress on bainite transformation, microstructure, and mechanical properties are investigated by metallography, dilatometry, etc. Results show that compressive stress during bainite transformation accelerates the bainite transformation and increases the final bainite amount due to the additional mechanical driving force. The lath‐like bainite becomes shorter, and smaller blocky martensite/austenite islands form under stress during the bainite reaction. Different from the results with stress during bainite transformation, applying stress after bainite transformation during isothermal holding cannot increase the volume fraction of bainite, and no obvious change in bainite morphology is observed. In addition, the subsequent martensite transformation is promoted during the cooling process. Moreover, the less amount of retained austenite (RA) but more carbon content in RA is obtained with applying stress after the bainite reaction. Finally, the tensile strength increases, while the elongation decreases when the external stress is imposed after bainite transformation.

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Modeling the role of external stresses on the austenite-to-bainite phase transformation in 51CrV4 steel

Cited by 16 publications

References 35 publications

Effects of Plastic Stress on Transformation Plasticity and Microstructure of a Carbide-Free Bainite Steel

Effects of Plastic Stress on Transformation Plasticity and Microstructure of a Carbide-Free Bainite Steel

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

The Effect of Stress on Bainite Transformation, Microstructure, and Properties of a Low‐Carbon Bainitic Steel

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