Dynamic continuous cooling transformation, microstructure and mechanical properties of medium-carbon carbide-free bainitic steel

Chen, Xi; Wang, Fuming; Li, Changrong

doi:10.1515/htmp-2020-0051

Cited by 8 publications

(1 citation statement)

References 38 publications

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“…Among them, Nb has a higher effect on retarding the recrystallization of austenite, and has the strongest solute drag effect on grain boundaries and dislocation motion [73,74], which results in a general refinement of the microstructure. Additions even below 0.04 wt.% suffice to have a significant effect on the heat treatment [75], and for contents equal or higher than 0.06 wt.%, a precipitated phase has been observed [76]. Similarly, secondary hardening in low carbon Nb-Mocontaining bainitic steels has been reported to significantly increase the strength of these microstructures [77].…”

Section: Low/medium C Content Cfb Steels: Transformation On Continuou...mentioning

confidence: 96%

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: Low/medium C Content Cfb Steels: Transformation On Continuou...mentioning

confidence: 96%

Viewpoints on Technological Aspects of Advanced High-Strength Bainitic Steels

Morales-Rivas

2022

Metals

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A Novel Continuous Cooling Treatment Based on the Carbon Diffusion Process During Nanobainite Transformation in High‐Carbon Steel

Fan

Guo

Deng

et al. 2023

steel research int.

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A novel methodology of carbon‐diffusion‐dominated continuous cooling treatment (CC) during the bainite transformation is proposed and implemented on a high‐carbon nanobainitic steel. Nanobainite (NB) microstructure composed of bainitic ferrite lath with a thickness of ≈36 nm is obtained by successive heat treatment processes, including cooling the sample from 240 to 216 °C at a rate of 0.1 °C min−1, then cooling down to 120 °C at a rate of 0.2 °C min−1 followed by austempering at 120 °C for 12 h. Several technological routines involving oil quenching + tempering, single‐stage austempering + tempering, and two‐stage austempering + tempering are compared. The effects of heat treatment processes on the microstructure and mechanical properties are unveiled. Importantly, after the CC process, the tensile strength is 2049 MPa, the yield strength is 1552 MPa, the elongation is 2.5%, the impact toughness is 11.5 J, and the hardness is 60.7 HRC. Notably, the comprehensive mechanical properties of CC‐processed samples are superior to that of other heat‐treated samples. Microstructure analyses reveal that the CC process significantly refines the bainitic ferrite lath thickness while increasing the volume fraction of NB. Thereby, effectively shrink blocky retained austenite, and finally enhancing the overall mechanical properties.

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