Ausforming and tempering of a novel ultra-high strength steel

Sun, Yiwei; Quan, Johny; Salvador, Heather; Edwards, Joshua R.; Lin, Jeffrey D.; Kozmel, Thomas; Mathaudhu, Suveen

doi:10.1016/j.msea.2022.142750

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…Therefore, the classic Williamson–Hall method was recently utilized in several studies which evaluated the dislocation density of the tempered microstructure of ultrahigh strength steels. [ 45–52 ] No martensitic microstructures with the high dislocation density exist in the present steels, and their microstructure is comparable with the tempered steel consisting of fully ferritic matrix‐containing precipitates; thus, this study calculated the dislocation densities using the classic Williamson–Hall method (Equation (3))

\left(^{\rho = \textrm{ } \sqrt{} \rho}\right)_{\text{s}} \left(^{\rho}\right)_{\text{p}}

where ρ s is the dislocation density calculated from strain broadening and ρ p is the dislocation density calculated from crystallite size. The following Equation (4) and (5) were used to evaluate ρ s and ρ p of the body‐centered cubic metal

\left(\rho\right)_{\text{s}} = \textrm{ } 14.4 \left(\epsilon\right)^{2} / F b^{2}

\left(\rho\right)_{\text{p}} = \textrm{ } 3 n / D^{2}

where ε is microstrain, b is Burgers vector, F is an interaction factor assumed to be 1, and D is crystallite size.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the classic Williamson-Hall method was recently utilized in several studies which evaluated the dislocation density of the tempered microstructure of ultrahigh strength steels. [45][46][47][48][49][50][51][52] No martensitic microstructures with the high dislocation density exist in the present steels, and their microstructure is comparable with the tempered steel consisting of fully ferritic matrix-containing precipitates; thus, this study calculated the dislocation densities using the classic Williamson-Hall method (Equation (3))…”

Section: Dislocation Densitymentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Strengthening Mechanisms in Novel Fully Ferritic Advanced High‐Strength Steels

Nousiainen,

Hannula,

Saukko

et al. 2023

steel research int.

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New steel alloying concepts were designed in order to produce a fully ferritic, low‐alloy steel with high (1 GPa) ultimate tensile strength. A simulated hot‐deformation process of the Ti‐Mo‐V‐Nb and Ti‐Mo‐V steels was designed for that purpose, and the strengthening mechanisms of the steels were evaluated after the isothermal dwell at three different temperatures (590 °C, 630 °C, and 680 °C). The tensile strength (TS) and the yield strength (YS) of the test alloys were estimated via hardness measurements. Results showed that the estimated tensile strength (TS) of over 1000 MPa and yield strength (YS) of over 900 MPa could be achieved in both steels, although the contribution of different strengthening mechanisms to the YS varied between the steels. The effect of the dislocation strengthening could especially compensate the reduced effect of the precipitation strengthening at all tested coiling temperatures (CT). Based on the results, a CT range of 590–630 °C with the 1800 s dwell time seemed to be a potential process window for the studied steels after the present TMCP route.This article is protected by copyright. All rights reserved.

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