Tensile behaviour of thermally-stable nanocrystalline bainitic-steels

Fallah, G.M.A.M.El; Bhadeshia, H. K. D. H.

doi:10.1016/j.msea.2018.12.124

Cited by 15 publications

(2 citation statements)

References 23 publications

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“…A value for the Koistinen-Marburger coefficient β is empirical. However, it can be correlated to the temperature at which the martensitic transformation is considered complete if the integrated form of the phase transformation model is used [27][28][29]. The SH-CCT curve is validated with the experimental SH-CCT curve, and the study obtained the β to be 0.00004 (1/k) for the E36 marine steel.…”

Section: Leblond-devaux and Koistinen-marburger Equations For Phase T...mentioning

confidence: 99%

A Parameterized Leblond–Devaux Equation for Predicting Phase Evolution during Welding E36 and E36Nb Marine Steels

El-Fallah

Qing

et al. 2023

Materials

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High heat input welding can improve welding efficiency, but the impact toughness of the heat-affected zone (HAZ) deteriorates significantly. Thermal evolution in HAZ during welding is the key factor affecting welded joints’ microstructures and mechanical properties. In this study, the Leblond–Devaux equation for predicting phase evolution during the welding of marine steels was parameterized. In experiments, E36 and E36Nb samples were cooled down at different rates from 0.5 to 75 °C/s; the obtained thermal and phase evolution data were used to construct continuous cooling transformation diagrams, which were used to derive the temperature-dependent parameters in the Leblond–Devaux equation. The equation was then used to predict phase evolution during the welding of E36 and E36Nb; the quantitative experimental phase fractions of the coarse grain zone were compared with simulated results to verify the prediction results, which are in good agreement. When heat input is 100 kJ/cm, phases in the HAZ of E36Nb are primarily granular bainite, whereas for E36, the phases are mainly bainite with acicular ferrite. When heat input increases to 250 kJ/cm, ferrite and pearlite form in both steels. The predictions agree with experimental observations.

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Section: Leblond-devaux and Koistinen-marburger Equations For Phase T...mentioning

confidence: 99%

A Parameterized Leblond–Devaux Equation for Predicting Phase Evolution during Welding E36 and E36Nb Marine Steels

El-Fallah

Qing

et al. 2023

Materials

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“…Based on the results of experimental investigation, Bhadeshia has proposed that there is a minimum amount of retained austenite necessary to cause the increase of the work-hardening capability and the enhancement of ductility of nanobainitic steels. He suggests this threshold content of retained austenite is equal to about 10% [22,23]. Additionally, Bhadeshia has argued that the retained austenite should have an optimum mechanical stability to delay necking in the deformed specimen [24].…”

Section: Deformation Mechanisms Operating During Quasi-static Tensile Strain Of Nanobainitic Steelsmentioning

confidence: 99%

Controlling the Content and Morphology of Phase Constituents in Nanobainitic Steel Containing 0.6%C to Obtain the Required Ratio of Strength to Plasticity

Marcisz¹,

Garbarz²,

Janik³

et al. 2021

Metals

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The phase composition of nanobainitic steel 0.56–0.60%C, 1.68–1.95%Mn, 1.58–1.80%Si, 1.30–1.47%Cr, 0.57–0.75%Mo is described in this paper. The phase composition is controlled in order to obtain diversified mechanical properties for specific applications, such as armor plates. The effect of temperature and time of isothermal heat treatment on both the microstructure and the mechanical properties of the steel were determined. Dilatometric studies, as well as measurements of volume fraction and size distribution of retained austenite were carried out. Analysis of the kinetics of isothermal transformation in the temperature range of 200–225 °C for times of up to 144 h were also carried out, and the parameters of the production process of the steel were determined. A microstructure consisting of nanolathy carbideless bainite and blocky and lathy retained austenite, providing tensile strength of at least 2000 MPa, yield strength of at least 1300 MPa, and total elongation of at least 10% has been found.

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Insights into the Strain Rate on Microstructure Evolution of Carbide‐Free Bainitic Steel

Zhou

Liao

et al. 2022

steel research int.

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The microstructural transformation behavior of carbide-free bainitic steel at different strain rates is investigated using a combination of scanning electron microscopy, transmission electron microscopy, and electron backscatter diffraction. The results demonstrate that the stress-strain relationship of the steel exhibits a dependence on the strain rate, with the tensile strength increasing from 1441 MPa at a strain of 0.1 s À1 to 1537 MPa at 500 s À1 , with the elongation of the sample increasing from 16.0% to 22.0% under these conditions. The increase in the strain rate raises the degree of local deformation with blocky martensite/ retained austenite, exhibiting that different degrees of fragmentation and bainitic ferrite laths are observed to undergo torsional deformation. Through continuous dislocation absorption, the dislocation walls and dislocation tangles gradually develop into low-angle subgrain boundaries, primarily located in regions with high kernel average misorientation values. After deformation at a strain rate of 0.1 s À1 , the sample exhibits a Brass texture and demonstrates a combination of both Brass þ Goss textures at a strain rate of 500 s À1 .

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Tensile behaviour of thermally-stable nanocrystalline bainitic-steels

Cited by 15 publications

References 23 publications

A Parameterized Leblond–Devaux Equation for Predicting Phase Evolution during Welding E36 and E36Nb Marine Steels

A Parameterized Leblond–Devaux Equation for Predicting Phase Evolution during Welding E36 and E36Nb Marine Steels

Controlling the Content and Morphology of Phase Constituents in Nanobainitic Steel Containing 0.6%C to Obtain the Required Ratio of Strength to Plasticity

Insights into the Strain Rate on Microstructure Evolution of Carbide‐Free Bainitic Steel

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