Analysis of the variation in nanohardness of pearlitic steel: Influence of the interplay between ferrite crystal orientation and cementite morphology

Debehets, Jolien; Tacq, Jeroen; Favache, Audrey; Jacques, Pascal; Seo, Jin Won; Verlinden, Bert; Seefeldt, Marc

doi:10.1016/j.msea.2014.08.019

Cited by 24 publications

(5 citation statements)

References 18 publications

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“…The strength of pearlite rail steel can be improved to near 1300 MPa by chemical composition optimization and heat treatment [1][2][3]. This value is close to its upper limit in strength and the toughness of pearlite rail significantly decreases with the increase in strength.…”

Section: Introductionmentioning

confidence: 99%

Effects of Tempering on the Microstructure and Properties of a High-Strength Bainite Rail Steel with Good Toughness

Zhu

Zhou

et al. 2018

Metals

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An advanced bainite rail with high strength-toughness combination was produced in a steel mill and the effects of tempering on the microstructure and properties of the bainite rail steel were investigated by optical microscopy, transmission electron microscopy, electron back-scattering diffraction and X-ray diffraction. Results indicate that the tensile strength, elongation and impact toughness were about 1470 MPa, 14.5% and 83 J/cm 2 , respectively, after tempering at 400 • C for 200 min. Therefore, a high-strength bainite rail steel with good toughness was developed. In addition, the amount of retained austenite (RA) decreased due to bainite transformation after low-temperature tempering (300 • C) and RA almost disappeared after high-temperature tempering (500 • C). Moreover, as the tempering temperature increased, the tensile strength of the rail head first decreased due to the decreased dislocation density and carbon content in bainite ferrite and the coarseness of bainite ferrite, and then increased because of carbide precipitation at high-temperature tempering. Furthermore, RA played a significant role in the toughness of bainite rail. The elongation and toughness of the rail obviously decreased after tempering at 500 • C for 200 min because of the disappearance of RA and appearance of carbides.

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Section: Introductionmentioning

confidence: 99%

Effects of Tempering on the Microstructure and Properties of a High-Strength Bainite Rail Steel with Good Toughness

Zhu

Zhou

et al. 2018

Metals

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“…Changes in ILS of pearlite and the misorientation angles along and across the ferrite lamellae show significant through-diameter variations at the drawing strain larger than 1.5 [17]. The hardness in different nodules of pearlite (a volume with the same or a similar ferrite crystal orientation) are significantly different, suggesting the ferrite crystal orientation has a great influence on hardness [18]. Besides, the kernel average misorientation (KAM) is a parameter calculated to assess the distribution of local plastic strain as well as dislocation density.…”

Section: Introductionmentioning

confidence: 98%

Effects of microstructure and crystallography on mechanical properties of cold-rolled SAE1078 pearlitic steel

Liu

Yang

Liu

et al. 2018

Materials Science and Engineering: A

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The evolution of the microstructure and crystallography in SAE1078 pearlitic steel sheets under different cold-rolling reductions of up to 90% were quantified using transmission electron microscopy (TEM), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). The mechanical properties were determined by tensile testing at room temperature. TEM analysis showed that the pearlite structure was obviously refined with the interlamellar spacing decreasing to about 57 nm at the rolling reduction of 90%. EBSD investigations indicated that the ferrite exhibited a {001}texture in the 90% cold-rolled pearlitic steel. The dislocations were mainly concentrated during cold rolling between the 10% and 70% reduction ratios as the average kernel average misorientation (KAM) angle increased from 0.75° to 1.20°. XRD examination revealed that a transformation from bcc to bct crystal structure of ferrite occurred at 90% rolling reduction due to the supersaturation of carbon. Significant augmentation in the ultimate tensile strength during cold rolling results from the boundary, dislocation, and solid solution strengthening mechanisms.

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Section: Introductionmentioning

confidence: 99%

“…[19] Debehets et al investigated the effect of relative orientations of ferrite crystals and Fe 3 C lamellae on the hardness of pearlitic steel by using electron backscattered diffraction (EBSD), nanoindentation, and scanning electron microscopy (SEM). [20] In this study, the 2D RVE FE model developed for high-carbon steels to estimate the elastic and elastoplastic behavior from real ferrite-cementite-based field emission scanning electron microscope (FESEM) micrograph has two major characteristics. First, the values of all the model parameters like elastic modulus and Poisson's ratio, strength coefficient and strain hardening exponent, applied boundary conditions (BCs), etc.…”

Section: Introductionmentioning

confidence: 99%

Microstructure‐Based Modeling and Estimation of Mechanical Properties of High‐Carbon Steel

Dey

Das

Saha

et al. 2023

steel research int.

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Herein, attempts are made to estimate the mechanical properties using microstructure‐based finite element (FE) modeling and validate these results with the experimental results. The two high‐carbon steel specimens are hot‐rolled and air‐cooled to develop ferrite–pearlite microstructures. Different characterizations are utilized to observe microstructures as well as Vickers hardness and tensile tests are carried out to determine the mechanical properties. Two high‐resolution scanning electron micrographs are chosen for representative volume element‐based FE analyses for modeling the mechanical behavior of ferrite–cementite microstructure. Object‐oriented finite elements (OOF2) and Abaqus FEA 6.14 software are used to estimate the elastic and elastoplastic behavior assuming plane stress conditions. The correlation between cementite lamellae orientation and the predicted elastoplastic properties is investigated and compared with the experimental results. The influence of image size and mesh size on the predicted true stress–true strain behavior is discussed. The hard and brittle cementite lamellae face maximum stress while the softer ferrite matrix experiences maximum strain. It is found that strain accumulation is maximum at the interfaces of ferrite and cementite. These findings are further validated by the microvoid and crack initiation spots in the fracture surface and subsurface micrographs of broken tensile specimens.

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Analysis of the variation in nanohardness of pearlitic steel: Influence of the interplay between ferrite crystal orientation and cementite morphology

Cited by 24 publications

References 18 publications

Effects of Tempering on the Microstructure and Properties of a High-Strength Bainite Rail Steel with Good Toughness

Effects of Tempering on the Microstructure and Properties of a High-Strength Bainite Rail Steel with Good Toughness

Effects of microstructure and crystallography on mechanical properties of cold-rolled SAE1078 pearlitic steel

Microstructure‐Based Modeling and Estimation of Mechanical Properties of High‐Carbon Steel

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