Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range

Bräutigam–Matus, Krishna; Altamirano, Gerardo; Salinas‐Rodríguez, Armando; Flores, Alfredo; Goodwin, Frank

doi:10.3390/met8090674

Cited by 22 publications

(16 citation statements)

References 34 publications

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“…A slight decrease in the bainitic transformation start temperature was also observed. Similar issues, concerning the influence of plastic deformation on microstructure and the shape of CCT curves were presented in [21,22].…”

Section: Introductionmentioning

confidence: 60%

Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel

Wojtacha¹,

Opiela²

2021

Adv. Sci. Technol. Res. J.

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Section: Introductionmentioning

confidence: 60%

Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel

Wojtacha¹,

Opiela²

2021

Adv. Sci. Technol. Res. J.

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“…A third transformation phase also occurred in the CCT diagram, which is located above the bainitic region and is formed by a ferrite. The ferritic transformation region occurred only at the last three cooling curves, namely 0.1, 0.05 and 0.01 [32,33].…”

Section: Cct Diagram Aisi 4340 Steelmentioning

confidence: 94%

Effect of Selected Cooling and Deformation Parameters on the Structure and Properties of AISI 4340 Steel

et al. 2020

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The paper is focused on investigation of the high-strength AISI 4340 steel at various temperature and deformation conditions. The article is divided into two specific analyses. The first is to examine the dilatation behavior of the steel at eight different cooling rates, namely, 100, 10, 5, 1, 0.5, 0.1, 0.05 and 0.01 °C·s−1. The mapping of the phase transformations due to varying cooling rates from the austenitizing temperature of 850 °C allows the construction of the CCT diagram for a given high-strength steel. These dilatation curves were also compared with the metallography of the selected samples for the proper construction of the CCT diagram. A further analysis of the high temperature deformation of high strength steel AISI 4340 was performed in the range of temperature 900–1200 °C, and the strain rate was in the range from 0.001 to 10 s−1 with maximum value of the true strain 0.9. Changes in the microstructure were observed using light optical microscopy (LOM). The effect of hot deformation temperature on true stress, peak stress and true strain was investigated. The hardness of all deformed samples, depending on the temperature, the deformation rate and the peak stress σp overall together related with hardness, has also been evaluated.

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“…In this case, we used prism-shaped samples with a rectangular base, Figure 2. Flat-shaped samples for the dilatometry test are used for thin materials, usually with a thickness of >4 mm [6,35,36]. Opposite surfaces (after a longer edge) of the test sample must be parallel and surface roughness of 5 µm or less is required.…”

Section: Preparation Of Samples For Dilatometric Analysismentioning

confidence: 99%

“…The construction of a CCT diagram can be achieved in several ways. In the research papers [29][30][31][32][33][34][35][36], a CCT diagram was constructed using dilatometric measurements, structural analysis, and hardness measurements. In certain cases, in technical practice, the prediction of the CCT diagram is also sufficient, especially for expensive materials, or lack of time.…”

Section: Introductionmentioning

confidence: 99%

Determination of CCT Diagram by Dilatometry Analysis of High-Strength Low-Alloy S960MC Steel

et al. 2022

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High-strength steels are used more than general structural steel due to their combination of properties such as high strength, good toughness and weldability. They are mainly used in the manufacture of heavy vehicles for the mining industry, cranes, transportation, etc. However, welding these grades of steel brings new challenges. Also, a simulation for welding high-strength steel is required more often. To insert a material database into the simulation program, it is necessary to conduct investigations using CCT (Continuous Cooling Transformation) diagrams, welded joints research, and more. To investigate the behavior of S960MC steel during heating and cooling, we used dilatometry analysis supported by EBSD (Electron Backscatter Diffraction) analysis. A CCT diagram was constructed. The transformation temperatures of Ac1 and Ac3 increase with increasing heating rate. The Ac1 temperature increased by 54 °C and the Ac3 temperatures by 24 °C as the heating rate increased from 0.1 °C/s to 250 °C/s. The austenite decomposition temperatures have a decreasing trend in the cooling phase with increasing cooling rate. As the cooling rate changes from 0.03 °C/s to 100 °C/s, the initial transformation temperature drops from 813 °C to 465 °C. An increase in the cooling rate means a higher proportion of bainite and martensite. At the same time, the hardness increases from 119 HV10 to 362 HV10.

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Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range

Cited by 22 publications

References 34 publications

Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel

Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel

Effect of Selected Cooling and Deformation Parameters on the Structure and Properties of AISI 4340 Steel

Determination of CCT Diagram by Dilatometry Analysis of High-Strength Low-Alloy S960MC Steel

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