Mechanical properties of nanostructured bainitic steels

Kumar, Avanish; Singh, Aparna

doi:10.1016/j.mtla.2021.101034

Cited by 37 publications

(8 citation statements)

References 103 publications

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“…Such a drawback is compensated by the improved mechanical properties with respect to bainitic steels with lower C content. Moreover, some in-use properties, such as wear resistance, have been shown to improve as the hardness of these bainitic steels increases [20], as also concluded in [21]. The quenching to temperatures above M s and the isothermal treatment result in a highly homogeneous microstructure, allowing this process to be applied for the manufacturing of components with dimensions in a very wide range.…”

Section: Medium/high-c Nanostructured Bainitic Steels From Isothermal...mentioning

confidence: 77%

“…However, the study of a microstructure obtained by an isothermal treatment at a temperature higher than those characteristic of nanostructured bainite, 350 • , has revealed contrary results. In that case, white etching areas, with a nanocrystalline structure and cracks, have been observed after RCF testing [21,22]. Further research on that topic is thus recommended.…”

Section: Medium/high-c Nanostructured Bainitic Steels From Isothermal...mentioning

confidence: 91%

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Viewpoints on Technological Aspects of Advanced High-Strength Bainitic Steels

Morales-Rivas

2022

Metals

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The development of advanced high-strength bainitic steels has been preceded and linked to different metallurgical advances, both in the field of fundamental materials science and in technological fields closer to the production and final application. The diversity and abundance of documents in literature has favored the co-existence of extensive terminology in the context of advanced high-strength steels and bainitic steels. In this work, the concept of advanced high-strength bainitic steels is briefly revisited from a wide perspective, with the aim of highlighting the main limitations and challenges for further development of these microstructures.

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Section: Medium/high-c Nanostructured Bainitic Steels From Isothermal...mentioning

confidence: 77%

Section: Medium/high-c Nanostructured Bainitic Steels From Isothermal...mentioning

confidence: 91%

Viewpoints on Technological Aspects of Advanced High-Strength Bainitic Steels

Morales-Rivas

2022

Metals

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“…The results are in the expected range for the materials studied. While there are bainitic steels with better mechanical properties [65,66], this is usually due to higher carbon content or a nanostructured bainite. Other bainitic steels also with a low carbon content present a similar behavior to the one observed here [67,68].…”

Section: Experimental Results and Fitted Parametersmentioning

confidence: 99%

Advanced Crystal Plasticity Modeling of Multi-Phase Steels: Work-Hardening, Strain Rate Sensitivity and Formability

et al. 2021

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This work presents an advanced crystal plasticity model for the simulation of the mechanical behavior of multiphase advanced high-strength steels. The model is based on the Visco-Plastic Self-Consistent (VPSC) model and uses information about the material’s crystallographic texture and grain morphology together with a grain constitutive law. The law used here, based on the work of Pantleon, considers how dislocations are created and annihilated, as well as how they interact with obstacles such as grain boundaries and inclusions (carbides). Additionally, strain rate sensitivity is implemented using a phenomenological expression derived from literature data that does not require any fitting parameter. The model is applied to the study of two bainitic steels obtained by applying different heat treatments. After fitting the required parameters using tensile experiments in different directions at quasi-static and high strain rates, formability properties are determined using the model for the performance of virtual experiments: uniaxial tests are used to determine r-values and stress levels and biaxial tests are used for the calculation of yield surfaces and forming limit curves.

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“…Nanostructured bainitic steels, characterized by nanosized bainitic ferrite (BF) laths and a retained austenite (RA) film, have garnered significant attention due to their exceptional mechanical properties. [1,2] Their notable strength can mainly be attributed to the presence of nanosized BF laths, whereas good ductility results from RA's transformation-induced plasticity (TRIP) effect. [3,4] The volume fraction and stability of RA play crucial roles in influencing the TRIP effect during deformation.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Microstructure and Mechanical Properties of a High‐Carbon Bainitic Steel Treated by Long‐Time Bainitic Austempering and Short‐Time Austempering Plus Tempering Processes

Wang,

Gao,

Gui

et al. 2024

steel research int.

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Herein, the microstructure and mechanical properties of a high‐carbon bainitic steel treated by long‐time bainitic austempering and short‐time austempering plus tempering processes are compared. The multiphase microstructures are characterized by dilatometry, X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy to correlate with mechanical properties. Results show that although long‐time austempering treatment can reduce the volume fraction of brittle martensite, no significant improvement is observed in fracture damage resistance. Besides, the cementite is prone to precipitation from the austenite at the later period of the long‐time austempering process. The cementite precipitation in austenite decreases the carbon content in retained austenite (RA) and consequently reduces the mechanical stability of RA. In contrast, the cementite has not been able to precipitate from austenite after short‐time austempering treatment, whereas the martensite is softened and the stability of RA is improved during subsequent tempering. Therefore, excellent mechanical properties are obtained in the samples treated by short‐time austempering plus tempering process: ultimate tensile strength, 1489 MPa, yield strength, 1014 MPa, total elongation, 33.2%, and the product of strength and elongation (PSE) of 48.4 GPa%, where PSE is increased by 27% compared with the sample after long‐time bainitic austempering.

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Mechanical properties of nanostructured bainitic steels

Cited by 37 publications

References 103 publications

Viewpoints on Technological Aspects of Advanced High-Strength Bainitic Steels

Viewpoints on Technological Aspects of Advanced High-Strength Bainitic Steels

Advanced Crystal Plasticity Modeling of Multi-Phase Steels: Work-Hardening, Strain Rate Sensitivity and Formability

Comparison of Microstructure and Mechanical Properties of a High‐Carbon Bainitic Steel Treated by Long‐Time Bainitic Austempering and Short‐Time Austempering Plus Tempering Processes

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