Recipe for improving the impact toughness of high-strength pearlitic steel by controlling the cleavage cracking mechanisms

Behera, Swarnalata; Barik, Rakesh Kumar; Sk, Md. Basiruddin; Mitra, Rahul; Chakrabarti, Debalay

doi:10.1016/j.msea.2019.138256

Cited by 19 publications

(7 citation statements)

References 44 publications

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“…While OOF2 measures RVEs in terms of the number of pixels along two mutually perpendicular directions, the sizes of the RVEs in micrometers can be easily obtained. In the present study, the RVE sizes vary from 426 Â 375 pixel 2 (2.01 Â 1.78 μm 2 ) to 1274 Â 948 pixel 2 (6.02 Â 4.5 μm 2 ) for HC0 and 426 Â 414 pixel 2 (2.01 Â 1.95 μm 2 ) to 1274 Â 957 pixel 2 (6.02 Â 4.5 μm 2 ) for HC1 steels. The simulation varies from the actual situation in the following ways.…”

Section: Experimental and Computational Proceduresmentioning

confidence: 55%

“…due to superior strength, wear resistance, and machinability. [1,2] The microstructure and mechanical property correlation of ferrite-pearlite (F-P) steels with near-eutectoid compositions has been studied by many researchers to date by combining numerous numerical and experimental methods. [3][4][5] It has already been reported that the microstructural characteristics like ferrite grain size, the volume fraction of ferrite (F) and pearlite (P), pearlite nodule size, interlamellar spacing (λ), etc.…”

Section: Introductionmentioning

confidence: 99%

“…[11,14] They have used Ludwik's equation for modeling the flow curves of the constituent phases, which is similar to an earlier study by Sun et al [11,14,15] Modeling the elastoplastic behavior of the pearlite phase from a microstructure consisting of alternative ferrite and cementite lamellae is an important area for researchers to explore because these types of steels possess an excellent combination of strength and ductility. [1,2] It has already been reported that under uniaxial loadings, enormous variations in the stress and strain values occur in soft ferrite and hard cementite phases. [11,14] Ishikawa et al studied the deformation behavior of F-P steel and they have shown that the modeling results correlate well with the experimental flow behavior for an axisymmetric unit cell.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Experimental and Computational Proceduresmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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show abstract

“…Therefore, when the crack enters the SCP region, the direction of crack propagation forms a certain angle with the growth direction of columnar dendrites. Due to the obstruction of grain boundaries on crack propagation [30] and the TRIP effect of RA, the fracture resistance in the SCP region is enhanced, and the pop-in phenomenon on the F-V curve disappears.…”

Section: Relationships Between Microstructure and Cryogenic Fracture ...mentioning

confidence: 99%

Effect of microstructure heterogeneity on the cryogenic fracture toughness of the dissimilar joint between SA645 and 304L made by laser welding

Zhou,

Wu,

et al. 2023

Mater. Res. Express

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The cryogenic fracture toughness of the SA645/304L dissimilar weld, produced using continuous wave IPG fiber laser welding with a 0.3 mm beam offset towards the 304L side, and the microstructural effects on the fracture behavior were systematically investigated. The weld metal consists of ∼89% columnar dendritic martensite and ∼11% retained austenite (RA), where the ununiform distribution of constituent phases as well as the distinctions between martensite and RA in terms of morphology and mechanical properties lead to the microstructure heterogeneity of weld metal. Pop-in phenomenon appears on the Force-Displacement (F-V) curve during the crack tip opening displacement (CTOD) test for the weld. The CTOD value for the weld is ∼0.057 mm, about 8 times less than that when pop-in effect is ignored (∼0.563 mm). Rapid propagation of the pre-fatigue crack tip along the center of the weld leads to the pop-in phenomenon. Fracture surface in pre-fatigue crack tip (PCT) region shows quasi-cleavage features, while fracture surface in stable crack propagation (SCP) region presents a ductile-fractured surface with dimples. The crack propagation path in SCP region is frequently deflected. Inhibition effect of grain boundaries on crack propagation and TRIP effect of retained austenite (RA) result in the improvement in fracture toughness of the SCP region.

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“…As the cooling rate increases, the degree of phase transition supercooling also increases, and the phase transition temperature A r3 of austenite to pearlite decreases. [28][29][30] The phase transition temperature of austenite to pearlite has an effect on the interlayer pearlite spacing. Immediate ultrafast cooling after finish rolling to the intermediate temperature makes the preservation heat sufficient for tremendous carbon atoms to diffuse, and then the followed accelerated cooling to the coiling temperature complete the phase transition of supercooled austenite to different decomposition products.…”

Section: Formation Mechanism Of Ultrafine Pearlitementioning

confidence: 99%

Approaching to High Elongation of Automotive Steel by Controlled Cooling Strategy

Xue

Yin

Tian

et al. 2020

steel research int.

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Automobile steel with moderate tensile strength demands for higher total elongation, whereas present production cannot satisfy such requirement. To cope with the challenge for desired ductility, Ti, Nb, and V microalloyed steel is applied to a late‐stage ultrafast cooling (LUC) method as well as an interrupted ultrafast cooling (IUC) strategy to explore the effect of cooling process on the total elongation. It is found that an IUC can increase the total elongation and the lűders strain to about 45% and 60% higher in comparison with the LUC counterpart, respectively. Metallographic microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and orientation distribution function (ODF) are used to characterize the microstructure and texture components. It is revealed that the multiscale grain distribution and the multiphase constituent, especially the existence of ultrafine pearlite microstructure with several atomic layers of grain boundaries, are greatly important for the ductility enhancement. It is inferred that larger undercooling caused by ultrafast cooling strategy makes the dislocation density much higher, whereas Nb precipitation tends to induce the formation of lamellar pearlite structure.

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Recipe for improving the impact toughness of high-strength pearlitic steel by controlling the cleavage cracking mechanisms

Cited by 19 publications

References 44 publications

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

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

Effect of microstructure heterogeneity on the cryogenic fracture toughness of the dissimilar joint between SA645 and 304L made by laser welding

Approaching to High Elongation of Automotive Steel by Controlled Cooling Strategy

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