Special Issue "Advanced High-Strength Bainite Steels"

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 806

Special Issue Editor

State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Interests: ausforming and transformation kinetics in advanced high-strength bainite steels; microstructure and property control of ultra-high strength steels
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Special Issue Information

Dear Colleagues,

Advanced high-strength bainite steels have attracted extensive attention for decades due to their excellent combination of strength and toughness. The strength and hardness are sensitive to the morphology, volume fraction and dimension of bainite, while the ductility and toughness are essentially determined by the morphology, volume fraction and stability of the retained austenite. Many efforts have been made to improve the mechanical properties and performance of advanced high-strength bainite steels, via optimizing alloying elements, novel heat treatment processing, ausforming, etc. Low-temperature transformation is normally adopted to fabricate advanced high-strength bainite steels, thus leading to slow transformation kinetics, especially for high-carbon and high-alloy cases, which represents a barrier for industrial application.

Technological research is still needed for the implementation of advanced high-strength bainite steels, especially considering the compromise proposal of high performance and production cycle. Fundamental studies on transformation kinetics, crystallography, ausforming and mechanical properties will guide the development of advanced high-strength bainite steels.

Topics addressed in this Special Issue may include, but are not limited to: novel heat treatment processes, novel microstructures, new methods to accelerate transformation processes, mechanical performance, and fatigue behavior.

Dr. Haijiang Hu
Guest Editor

Manuscript Submission Information

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Keywords

  • bainite steel
  • nanobainite
  • retained austenite
  • transformation kinetics
  • crystallography
  • ausforming
  • heat treatment
  • high-strength
  • microstructural characterization
  • mechanical performance

Published Papers (1 paper)

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Research

11 pages, 2761 KiB  
Article
Analysis on the Key Parameters to Predict Flow Stress during Ausforming in a High-Carbon Bainitic Steel
Metals 2023, 13(9), 1526; https://doi.org/10.3390/met13091526 - 28 Aug 2023
Viewed by 491
Abstract
Since flow stress is an important parameter in the processing and application of metallic materials, it is necessary to trace the flow stress during austenite deformation. Thermal compression deformation of austenite in a high-strength bainitic steel was conducted using a Gleeble-3500 thermo-mechanical simulator, [...] Read more.
Since flow stress is an important parameter in the processing and application of metallic materials, it is necessary to trace the flow stress during austenite deformation. Thermal compression deformation of austenite in a high-strength bainitic steel was conducted using a Gleeble-3500 thermo-mechanical simulator, within the deformation temperature range of 400 °C~900 °C. By analyzing the stress–strain curves and strain-hardening exponent, the effects of strain hardening and dynamic recovery on the dislocation density of the material during the thermal processing were considered in the present work. Based on the general form of the Kocks–Mecking–Estrin (KME) model, the effects of deformation temperature and strain on the key parameters of the model were clarified. Differing from other work which commonly terms m (strain rate sensitivity exponent) and k2 (dimensionless parameters for dynamic recovery) as constants, the current models consider the quantitative relationship between key parameters and deformation temperature and strain. The results show that m is an exponential function related to temperature and strain, which decreases with the increase in strain. Meanwhile, k2 is a temperature-dependent polynomial function that increases as the deformation temperature increases. Finally, a modified constitutive KME model was proposed to predict the austenitic plastic stress with strain. Using established m-ε and k2-T models, the predicted curves are in good agreement with the experimental measurements. Full article
(This article belongs to the Special Issue Advanced High-Strength Bainite Steels)
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