Improving mechanical properties in high-carbon pearlitic steels by replacing partial V with Nb

Tian, Junyu; Wang, Houxin; Zhu, Min; Zhou, Mingxing; Zhang, Qi; Su, Xue; Guo, Aimin; Xu, Guang

doi:10.1016/j.msea.2022.142622

Cited by 31 publications

(16 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As previously discussed, this could be attributed to partitioning of Nb during the continuous cooling 11 , resulting in a reduction of pearlite formation temperature. Tian et al 25 , studying high-carbon steel after deformation obtained different results from those shown here, the authors reported an increase in the pearlitic start temperature transformation with Nb and V addition to the steel. On the other hand, Yong et al 26 shown similar results to those found here, in which the Nb addition to a high-carbon steel delayed the pearlitic start transformation temperature resulting in a significantly increased hardenability of the material.…”

Section: Hot Torsion Testcontrasting

confidence: 65%

Effect of Niobium on Microstructure and Mechanical Properties of a Hypereutectoid Steel

et al. 2022

View full text Add to dashboard Cite

High-carbon steels have been used to high-strength steel wire and strands for prestressing concrete. The necessity of high-strength levels at increasingly larger diameters of wire rods is a technological challenge. Two steels with and without Nb were obtained in a steel mill, submitted to detailed microstructural (previous austenitic grain size, pearlite interlamellar spacing and colony size) and mechanical characterization through tensile tests and hardness. Hot torsion and dilatometry tests were performed to simulate steels processing and to verify the influence of Nb on phase transformation. Adding Nb to steel resulted in a refinement in austenitic grain size and pearlite colonies but had no effect on pearlitic interlamellar spacing. There was a decrease at the start transformation temperature austenite/pearlite and therefore an increase in the hardenability of the Nb-added steel. Finally, Nb addition proved to be a technical and economical way to increase tensile strength and to reduce the variability of the mechanical properties.

show abstract

Section: Hot Torsion Testcontrasting

confidence: 65%

Effect of Niobium on Microstructure and Mechanical Properties of a Hypereutectoid Steel

et al. 2022

View full text Add to dashboard Cite

show abstract

“…It is important to mention here the improvement in yield strength (≈18 MPa) and ultimate tensile strength (≈38 MPa) in HC1 steel attributed to the refinement of pearlite nodule size (≈27 μm), colony size (≈6 μm), and interlamellar spacing (≈48 nm) due to Nb microalloying. [ 34 ] It is worth mentioning here that the model‐generated true stress–strain curves were compared with the experimental results after converting the experimental engineering stress–strain values to true stress–strain values by using Equation (2) and (3)

\left(\epsilon\right)_{\text{t}} = ln \left(\right. 1 + \epsilon \left.\right)

$$\left(\sigma\right)_{\text{t}} = \sigma \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

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

Dey

Das

Saha

et al. 2023

steel research int.

View full text Add to dashboard Cite

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.

show abstract

“…This series of microstructure defects has an impact on the mechanical properties of steel [ 36 ]. For example, the initial austenite grain boundary and the precipitated Nb carbides will act as nucleation particles to induce the nucleation and growth of pearlite during the pearlite phase transformation process [ 37 ]. It is also difficult to quantify the difference in interface misorientation between pearlite clusters and pearlite fields.…”

Section: Discussionmentioning

confidence: 99%

Application Research on Nb Microalloying of High-Carbon Pearlite Bridge Cable Wire Rods

Zhu

Zhou

et al. 2023

Materials

View full text Add to dashboard Cite

The application of Nb microalloying to high-carbon pearlite bridge cable wire rod steel has always been controversial, especially in the actual production process, which will be affected by the cooling rate, holding temperature and final bonding temperature. In this paper, the experimental characterization, finite element simulation and phase diagram calculation of the test steel were carried out, then the microstructure and properties of different parts of Nb microalloying of bridge cable wire rods were compared and analyzed. The phase transition interval of pearlite during the water-cooling process of bridge cable wire rods is increased due to the refinement of austenite grains, and the significant increase in the end temperature of the phase transition makes the average interlamellar spacing of pearlite increase. The cooling rate of different parts of bridge cable wire rods simulated by Abaqus has little difference. At the same time, Nb microalloying effectively increases the proportion of low-angle grain boundaries, so that the overall average misorientation representing the surface defects is reduced. This helps to reduce the surface energy and increase the stability of the microstructure. Combined with the mechanical properties of microtensile rods, it is found that the grain refinement effect of Nb is greater than that of coarsening interlamellar spacing during hot rolling deformation in actual production, which makes the tensile strength at the 1/4 section increase significantly. The overall tensile strength and area shrinkage of the steel wire have also been effectively improved.

show abstract

Improving mechanical properties in high-carbon pearlitic steels by replacing partial V with Nb

Cited by 31 publications

References 35 publications

Effect of Niobium on Microstructure and Mechanical Properties of a Hypereutectoid Steel

Effect of Niobium on Microstructure and Mechanical Properties of a Hypereutectoid Steel

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

Application Research on Nb Microalloying of High-Carbon Pearlite Bridge Cable Wire Rods

Contact Info

Product

Resources

About