Effect of Step Quenching Heat Treatments on the Kinetics of Ferrite Formation and Quenching &amp; Partitioning Modeling for a Commercial C-Mn-Si Steel

Magalhães, Charles Henrique Xavier Morais; Campos, Pablo Henrique Kelly; Faria, Geraldo Lúcio de

doi:10.1590/1980-5373-mr-2021-0257

Cited by 5 publications

(1 citation statement)

References 48 publications

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“…[5] The strain-induced M transformation increases both strength and ductility.AHSS researchers have worked on Q-P steel in a variety of ways, including developing a theoretical model and exploring RA stability, [5][6][7][8] as well as optimizing experimental processes like the annealing, quenching, and partitioning stages. [9][10][11][12][13] Previous studies have indicated that the partial austenitization Q-P process may provide superior overall mechanical properties for the experimental steel than the full austenitization Q-P process, and that the quenching temperature (QT) has a greater impact on the composition of the room temperature microstructure. [14] Microalloying elements can not only drag solute atoms, but also improve matrix and refine grain through precipitated carbides.…”

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confidence: 99%

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Chu

Chen

Liu

et al. 2022

steel research int.

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Herein, the microstructures of the low‐carbon microalloyed quenching and partitioning (Q–P) steels are multiphase with ferrite (F), martensite (M), and retained austenite (RA) at different quenching temperatures (QTs), i.e., 140, 180, 240, and 300 °C. The volume fraction of fresh martensite (FM) increases from 8.6% to 61.4%, but the tempered martensite (TM) decreases from 49.7% to 0% with the QT increase. Meanwhile, the size of the precipitates (Nb, Ti)C tends to increase, whereas the fraction of the precipitates decreases first and then increases. With the increase of the QT, the yield strength (YS) decreases, the tensile strength (TS) increases, and the elongation first increases and then decreases. Additionally, the strengthening mechanism of Q–P steel is quantitatively analyzed in terms of F, M, RA, and precipitation strengthening. This study shows that F makes the same contribution to YS for the tested steels. The major strengthening mechanism of the Q–P steel is contributed by M, which accounts for about 43.7% to 56.0% of total YS. RA greatly influences the plasticity of Q–P steel and provides little to YS. With an increase in QT, the precipitation strengthening values first decrease and then increase.

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confidence: 99%

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Chu

Chen

Liu

et al. 2022

steel research int.

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Application of Intercritical Austenitizing in a Commercial CMnSi Steel as a Tool for Optimizing a One‐Step Quenching and Partitioning Cycle Aiming to Achieve a Third‐Generation Advanced High‐Strength Steel

Magalhães,

Corrêa,

Faria

2024

steel research int.

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Advanced high‐strength steels (AHSS) have been extensively studied to develop its third generation from relatively low‐cost alloys, but seeking optimized mechanical properties. In this context, the effects of quenching heat treatments are evaluated in this work after intercritical austenitizing (IA) on microstructure, alloying elements partitioning, and Ms temperature for a commercial CMnSi alloy. Applying dilatometric data and microstructural characterization, different heat cycles are evaluated. The obtained experimental results are compared with those ones obtained by computer simulations at equilibrium conditions. Based on this characterization, an optimized one‐step quenching and partitioning (Q&P) cycle (after IA) is proposed and applied to tensile test specimens. Then, the specimen microstructure is characterized by scanning and transmission electron microscopy as well as by X‐ray diffraction. Using the proposed methodology, it is possible to produce a Q&P steel with a product of tensile strength and elongation of 29.5 GPa% and a 7% volumetric fraction of retained austenite. It is concluded that the precise knowledge about the IA effects on the phase transformations and microstructure evolution in a commercial CMnSi alloy has great potential to be applied in defining a one‐step Q&P heat treatment that favors a multiphase microstructure, which meets mechanical properties requirements for a third‐generation AHSS.

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Effect of Austenite Grain Size on Phase Transformation and Q&P Design for a Commercial CMnSi Steel

Magalhães

Silva

Azzi

et al. 2023

J. of Materi Eng and Perform

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Effect of Step Quenching Heat Treatments on the Kinetics of Ferrite Formation and Quenching & Partitioning Modeling for a Commercial C-Mn-Si Steel

Cited by 5 publications

References 48 publications

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Application of Intercritical Austenitizing in a Commercial CMnSi Steel as a Tool for Optimizing a One‐Step Quenching and Partitioning Cycle Aiming to Achieve a Third‐Generation Advanced High‐Strength Steel

Effect of Austenite Grain Size on Phase Transformation and Q&P Design for a Commercial CMnSi Steel

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