Study on microstructures and work hardening behavior of ferrite-martensite dual-phase steels with high-content martensite

Zuo, Xunwei; Chen, Yunbo; Wang, Miaohui

doi:10.1590/s1516-14392012005000118

Cited by 19 publications

(12 citation statements)

References 10 publications

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“…Taking the true stresses between the yield strength and ultimate tensile strength and true strains, regression analysis yields n = 0.14 ± 0.01 and K = (1395 ± 85) MPa. The value of n = 0.14 is comparable with the values ranging from 0.12 to 0.40 reported by Zuo et al [19] for medium carbon low-alloy steels. For the strength coefficient, the values ranging from 1500 to 7000 MPa were reported for Fe-0.37C-0.48Si-0.86Mn-1.67Cr-0.36Mo- -0.015P-0.003S (wt.%) steel subjected to heat treatments [19].…”

Section: Work Hardening Behavioursupporting

confidence: 89%

“…The value of n = 0.14 is comparable with the values ranging from 0.12 to 0.40 reported by Zuo et al [19] for medium carbon low-alloy steels. For the strength coefficient, the values ranging from 1500 to 7000 MPa were reported for Fe-0.37C-0.48Si-0.86Mn-1.67Cr-0.36Mo- -0.015P-0.003S (wt.%) steel subjected to heat treatments [19]. Figure 11 shows evolution of work hardening rate Θ defined as Θ = dσ t dε t .…”

Section: Work Hardening Behavioursupporting

confidence: 89%

“…However, during the stage IV not only multiaxial stress conditions but also nucleation and growth defects such as cavities and cracks affect the work hardening behaviour in the necked region. It should be noted that three stages of the work hardening were reported by Zuo et al [19] for medium carbon low-alloy steels analysed in the terms of uniform deformation. Each stage of the work hardening can be well related to the deformation of microstructure constituents (ferrite and pearlite) as shown for DP steels by N. Farabi et al [20].…”

Section: Work Hardening Behaviourmentioning

confidence: 80%

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Tensile deformation behaviour of ferritic-pearlitic steel studied by digital image correlation method

Štamborská¹,

Lapin²,

Bajana³

et al. 2016

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Tensile deformation behaviour of ferritic-pearlitic steel was studied by the digital image correlation (DIC) method. Room temperature tensile tests were carried out at an initial strain rate of 1 × 10 −3 s −1 up to a defined elongation or fracture. The elongation and contraction were measured on the surface of cylindrical tensile specimens with random speckle pattern using stereo CCD camera system. The DIC elongation data were related to the data measured by an extensometer touching the specimens. The data from the DIC method were used for calculations of true stress-true strain tensile curves, strain hardening exponents and work hardening rates during uniform deformation up to the onset of plastic instability as well as non-uniform deformation during necking. Numerical simulations of strain fields within the gauge region of the specimens using finite element method were validated by the experimental data from the DIC method.

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Section: Work Hardening Behavioursupporting

confidence: 89%

Section: Work Hardening Behavioursupporting

confidence: 89%

Section: Work Hardening Behaviourmentioning

confidence: 80%

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Tensile deformation behaviour of ferritic-pearlitic steel studied by digital image correlation method

Štamborská¹,

Lapin²,

Bajana³

et al. 2016

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“…10c), the work hardening rate decreases to a minimum value of about 1200 MPa at ε t of about 10 % and then slightly increases with increasing true strain up to the tensile fracture. It should be noted that three stages of the work hardening were also reported by Zuo et al [21] for medium carbon low alloy steels when analysed in terms of true deformation. Figure 11 shows the typical microstructure in the gauge section of the tensile specimens.…”

Section: Work Hardening Behavioursupporting

confidence: 72%

Effect of hydrogenation on deformation behaviour of ferritic-pearlitic steel studied by digital image correlation method

Stamborska¹,

Lapin²,

Bajana³

2016

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The effect of hydrogenation on room temperature tensile deformation behaviour of ferritic-pearlitic steel was studied. The process of hydrogenation was realised by annealing in flowing hydrogen followed by a fast cooling to room temperature. The room temperature tensile deformation behaviour of hydrogenated and annealed specimens was studied by the digital image correlation (DIC) method. Tensile elongation and reduction of the area were measured on the surface of cylindrical specimens coated with random speckle patterns using stereo CCD camera system. DIC elongation data were related to the data measured by an extensometer touching the specimen gauge section. The data from the DIC method were used for calculations of true stress-true strain tensile curves. Numerical simulations of strain fields within the gauge region of the specimens using finite element method were validated by the experimental data from the DIC method.

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“…Conversely, the DP800 steel presents a faster strainhardening rate up to a maximum at the beginning stage of the plastic deformation (~1.5%) followed by a rapid decrease of the strain-hardening exponent. Previous works reported the two-stage work-hardening of DP steels 18,19 relating the source of the initial higher strain-hardening exponent to the plastic deformation of the ferrite matrix whereas in the second stage both ferrite (soft) and martensite (hard) and or bainite phases are plastically deformed.…”

Section: Mechanical Behaviormentioning

confidence: 99%

Void Formation and Strain-Induced Martensitic Transformation in TRIP780 Steel Sheet Submitted to Uniaxial Tensile Loading

et al. 2019

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This work aimed to analyze the damage behavior of cold rolled TRIP780 steel sheet submitted to interrupted uniaxial tensile tests performed along the rolling direction. The formation of voids is investigated as a function of the straining level using digital image analysis of scanning electron micrographs to obtain the measures of void density, void area fraction, void aspect ratio and mean void size. The volume fractions of both ferrite/martensite and retained austenite constituents were obtained from X-ray diffraction measurements. An abruptly decrease of retained austenite was observed at early stages of deformation followed by a slow saturation. The resulting strain-induced martensite is responsible for improving the formability of the TRIP780 as observed by instantaneous strain-hardening exponent. In the lower strain range, growth and coalescence of existing microvoids prevailed at both in-plane directions whereas nucleation of microvoids was also observed along the loading direction. Conversely, nucleation prevailed at the transverse direction in the intermediate strain range whereas growth and coalescence were predominant aligned to the loading direction. At larger strain levels, growth and coalescence of microvoids prevailed at both directions. The microvoids were initially found around inclusions and at the interface of ferrite-martensite phases and lastly also at the ferrite matrix.

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Study on microstructures and work hardening behavior of ferrite-martensite dual-phase steels with high-content martensite

Cited by 19 publications

References 10 publications

Tensile deformation behaviour of ferritic-pearlitic steel studied by digital image correlation method

Tensile deformation behaviour of ferritic-pearlitic steel studied by digital image correlation method

Effect of hydrogenation on deformation behaviour of ferritic-pearlitic steel studied by digital image correlation method

Void Formation and Strain-Induced Martensitic Transformation in TRIP780 Steel Sheet Submitted to Uniaxial Tensile Loading

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