The effect of bainite morphology on the mechanical properties of a high bainite dual phase (HBDP) steel

Bakhtiari, Reza; Ekrami, A.

doi:10.1016/j.msea.2009.07.042

Cited by 81 publications

(24 citation statements)

References 16 publications

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“…Previous investigations suggested that mechanical properties of F/B dual-phase steel were largely affected by bainite morphology. Bakhtiari and Ekrami pointed out that ferrite/lower bainite dual-phase steel had a better combination of high strength and improved impact energy, owing to fine plates and higher dislocation density in lower bainite [5]. They also found that the upper bainite would have an inverse effect on tensile strength and impact energy.…”

Section: Introductionmentioning

confidence: 99%

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Improved toughness and ductility in ferrite/acicular ferrite dual-phase steel through intercritical heat treatment

Shi

Zhang

Liu

et al. 2014

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

“…Recently, the dual-phase microstructure consisting of ferrite and bainite (F/B) has been designed for HSLA steels to improve the impact toughness and formability [5,6]. These properties are achieved as a result of a good combination of specific volume fraction of high-strength bainite phase and soft ferrite phase.…”

Section: Introductionmentioning

confidence: 99%

Improved toughness and ductility in ferrite/acicular ferrite dual-phase steel through intercritical heat treatment

Shi

Zhang

Liu

et al. 2014

Materials Science and Engineering: A

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“…The strength of these steels is due to the small length scale of the microstructure (relative fineness of bainite lathes) and high dislocation densities, whereas ductility was attributed to the film of retained austenite present in between the bainitic lathes. [2][3][4] The detrimental effect of carbides is overcome by suppressing their precipitation with the addition of a sufficient amount of silicon, [5,6] and the thin film of austenite acts as a cushion for any crack propagation. [7,8] A carbon-enriched austenite results in increased stability and thereby helps in minimizing the fraction of retained austenite transforming to martensite.…”

Section: Introductionmentioning

confidence: 99%

Development of New High-Strength Carbide-Free Bainitic Steels

Sharma

Sangal

Mondal

2011

Metall Mater Trans A

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An attempt was made to optimize the mechanical properties by tailoring the process parameters for two newly developed high-strength carbide-free bainitic steels with the nominal compositions of 0.47 pct C, 1.22 pct Si, 1.07 pct Mn, 0.7 pct Cr (S1), and 0.30 pct C, 1.76 pct Si, 1.57 pct Mn, and 0.144 pct Cr (S2) (wt pct), respectively. Heat treatment was carried out via two different routes: (1) isothermal transformation and (2) quenching followed by isothermal tempering. The results for the two different processes were compared. The bainitic steels developed by isothermal heat treatment were found to show better mechanical properties than those of the quenched and subsequently tempered ones. The effect of the fraction of the phases, influence of the transformation temperatures, the holding time, and the stability of retained austenite on the mechanical properties of these two steels was critically analyzed with the help of X-ray diffraction, optical metallography, scanning electron microscopy, and atomic force microscopy. Finally, a remarkable combination of yield strength of the level of 1557 MPa with a total elongation of 15.5 pct was obtained.

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“…The microstructure is refined and ferrite is introduced on the basis of the strengthened phase (tempered martensite) during this heat treatment process. Recently, it has been recognized that the multi-phase microstructure which consists of "soft" ferrite/ pearlite and "hard" bainite/martensite would improve the impact property of the steel [21,22] . The combination of soft ferrite and relatively hard secondary tempering martensite reduces the yield ratio and improves elongation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Mechanical

Zhao¹,

Chen²,

Wuqikun³

et al. 2020

Res. Appl. Mater. Sci.

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In this paper, a Fe-based Mn-Ni–Cr–Mo high strength low alloy (HSLA) steel was prepared by using Vacuum melting, following by hot rolling with 78% deformation and various heat treatment processes. Microstructure were characterized by optical microscope (OM), scanning electron microscope (SEM) equipped with energy dispersive spectrometer. Tensile tests were performed. After direct quenching (Q) from 860℃, the samples were subjected to secondary quenching (L) at different intercritical temperatures within the two-phase region and various tempering temperatures (T). Results show that QLT treatment increases elongation and decreases yield ratio compared with conventional quenching and tempering process (QT). The optimum QLT heat treatment parameter in terms of temperature are determined as Q: 860℃, L: 700℃, and T: 600℃, resulting in the better combined properties with yield strength of 756MPa, tensile strength of 820MPa, tensile elongation of 16.76% and yield ratio of 0.923

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The effect of bainite morphology on the mechanical properties of a high bainite dual phase (HBDP) steel

Cited by 81 publications

References 16 publications

Improved toughness and ductility in ferrite/acicular ferrite dual-phase steel through intercritical heat treatment

Improved toughness and ductility in ferrite/acicular ferrite dual-phase steel through intercritical heat treatment

Development of New High-Strength Carbide-Free Bainitic Steels

Effect of Heat Treatment on Microstructure and Mechanical

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