Effect of microstructure and chemical composition on dynamic factor of high strength steels

Qu, Jinbo; Dabboussi, Wael; Nemes, J. A.; Yue, Steve

doi:10.1179/174328408x307247

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…The strength of the SSSs can be increased by modifying composition, effective heat treatment, microalloying, and thermo-mechanical treatment [6][7][8][9][10]. Because the SSSs are usually martensitic steels, they can obtain optimal mechanical performance by quenching (Q) and tempering (T).…”

Section: Introductionmentioning

confidence: 99%

High-performance reality of 55SiCrV spring steel processed by the rapid-induction heat treatment

Dai

Liu²,

Chen

et al. 2023

Materials Science and Technology

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Heat treatment methodology is vital to achieve high performance of advanced spring steel. The present study has investigated the microstructure and mechanical properties of the 55SiCrV spring steel processed by a novel online rapid-induction heat treatment. The results showed that rapid heating refines the prior austenite grain size of the 55SiCrV spring steel, and the vanadium mainly exists as the solid solution in the matrix instead of the dispersive precipitation of the V-containing secondary phase under the rapid induction heat treatment condition. An optimal combination of mechanical properties simultaneously with ultrahigh strength and high plasticity was obtained and the properties of the steel are mainly enhanced by the hardenability and tempering resistance of solute V in the material.

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Section: Introductionmentioning

confidence: 99%

High-performance reality of 55SiCrV spring steel processed by the rapid-induction heat treatment

Dai

Liu²,

Chen

et al. 2023

Materials Science and Technology

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“…There are numerous chemical compositions and processing methods that can be used, but choosing the proper amount and type of elements for the material is extremely challenging, especially for bainitic rails, that will be subjected to natural cooling following rolling. The same is true for thermal processing, i.e., it is possible to modify the treatment time, the austenitization and austempering temperatures, and the cooling time, among other parameters (Ref [13][14][15][16][17]. Therefore, it is clear that many factors affect the selection of a material for the rails that is both suitable and enhanced relative to previous materials.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Retained Austenite on the Mechanical Properties of Bainitic and Dual Phase Steels

Adamczyk‐Cieślak

Koralnik

Kuziak

et al. 2022

J. of Materi Eng and Perform

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This paper presents the microstructural changes and mechanical properties of carbide-free bainitic steel subjected to various heat treatment processes and compares these results with similarly treated ferritic–pearlitic steel. A key feature of the investigated steel, which is common among others described in the literature, is that the Si content in the developed steel was >1 wt.% to avoid carbide precipitation in the retained austenite during the bainitic transformation. The phase identification before and after various heat treatment conditions was carried out based on microstructural observations and x-ray diffraction. Hardness measurements and tensile tests were conducted to determine the mechanical properties of the investigated materials. In addition, following the tensile tests, the fracture surfaces of both types of steels were analyzed. Changing the bainitic transformation temperature generated distinct volume fractions of retained austenite and different values of mechanical strength properties. The mechanical properties of the examined steels were strongly influenced by the volume fractions and morphological features of the microstructural constituents. It is worth noting that the bainitic steel was characterized by a high ultimate tensile strength (1250 MPa) combined with a total elongation of 18% after austenitizing and continuous cooling. The chemical composition of the bainitic steel was designed to obtain the optimal microstructure and mechanical properties after hot deformation followed by natural cooling in still air. Extensive tests using isothermal transformation to bainite were conducted to understand the relationships between transformation temperature and the resulting microstructures, mechanical properties, and fracture characteristics. The isothermal transformation tests indicated that the optimal relationship between the sample strength and total elongation was obtained after bainitic treatment at 400 °C. However, it should be noted that the mechanical properties and total elongation of the bainitic steel after continuous cooling differed little from the condition after isothermal transformation at 400 °C.

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“…The paper presents the results of the research aimed at detailed analysis of the deformed structure restoration processes occurring during continuous annealing of cold rolled strips to produce DP (Dual Phase) structure. The most direct way to obtain the DP (ferritic‐martensitic) steel involves annealing of a ferritic‐pearlitic structure in the α + γ two‐phase field, called intercritical annealing which is followed by controlled cooling, enabling the austenite to martensite transformation . Alternatively, controlled cooling can be performed from austenite (γ) single‐phase field, provided that a lean steel chemistry is applied combined with the capability of controlled cooling after reaching the peak temperature.…”

Section: Introductionmentioning

confidence: 99%

Application of FEG-SEM and EBSD Methods for the Analysis of the Restoration Processes Occurring During Continuous Annealing of Dual-Phase Steel Strips

Radwański

2015

steel research int.

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The paper presents results of the investigation aimed at the identification both qualitative and quantitative characterization of changes occurring in the structure of cold rolled DP steel during annealing in temperature range 600–700 °C. The investigation was conducted mostly by means of scanning electron microscopy combined with EBSD method. In the study, mechanisms of processes leading to subgrains formation related to static recovery, as well as to the processes connected with formation and growth of new grains in the examined material, which is characteristic feature of static recrystallization, were described. The role of the Fe3C carbide dissolution was examined which is crucial at the initial stages of as cold rolled structure transformation into austenite. Significance and the limitations of the parameters determined in EBSD analysis, such as IQ, KAM, GAM, and GOS for the quantitative characterization of the changes occurring in the structure were analyzed. These parameters are very important both for the qualitative and quantitative analysis of the structural changes occurring. They allow, among others, for determination of the fraction of deformed substructure subject to restoration processes during annealing. Examples illustrating the significance of these parameters and constraints on the analysis of recovery and recrystallization processes are presented.

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Effect of microstructure and chemical composition on dynamic factor of high strength steels

Cited by 11 publications

References 16 publications

High-performance reality of 55SiCrV spring steel processed by the rapid-induction heat treatment

High-performance reality of 55SiCrV spring steel processed by the rapid-induction heat treatment

The Impact of Retained Austenite on the Mechanical Properties of Bainitic and Dual Phase Steels

Application of FEG-SEM and EBSD Methods for the Analysis of the Restoration Processes Occurring During Continuous Annealing of Dual-Phase Steel Strips

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