The effect of the strain rate on the stress- strain curve and microstructure of AHSS

Gronostajski, Z.; Niechajowicz, A.; Kuziak, R.; Krawczyk, J.; Polak, S.

doi:10.1016/j.jmatprotec.2016.11.023

Cited by 54 publications

(28 citation statements)

References 16 publications

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“…The maximum stress appears at the smallest strain rate of 0.001 s −1 instead of the largest strain rate of 5.0 s −1 . The result is entirely opposite to the results in other studies that stress–strain curve rises with strain rate . The flow stress goes up with strain as expected because of work hardening of austenite.…”

Section: Resultscontrasting

confidence: 99%

“…The stress–strain curves for MCBS at different strain rates are shown in Figure a, while Figure b presents the stress–strain curves for the LCBS deformed at 400 °C at different strain rates. It can be observed from Figure a that for MCBS steel, stress increases with the strain as well as strain rate, which is consistent with previous studies . Flow stress reaches maximum values of about 570 MPa at the end of deformation (30% strain).…”

Section: Resultssupporting

confidence: 90%

“…As to strain rate, many studies have shown that the deformation resistance increases with the strain rate. For example, Gronostajski et al reported that flow stress increases with strain rate in three steels at room temperature. Pu et al studied the hot deformation characteristic of stainless steel at high temperature (950–1200 °C) and found that larger strain rate leads to a higher deformation resistance.…”

mentioning

confidence: 99%

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Effect of Strain Rate on Deformation Resistance during Ausforming in Fe–C–Mn–Si High‐Strength Bainite Steels

Chen

et al. 2018

steel research int.

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Deformation experiments for two bainite steels at different strain rates are conducted to analyze the effects of strain rate on deformation resistance during ausforming of two bainite steels. The results indicate that deformation resistance for medium-carbon steel increases with strain as well as strain rate due to work hardening. However, for low-carbon steel, although deformation resistance increases with strain due to work hardening, maximum flow stress unexpectedly appears in the specimen deformed at the smallest strain rate of 0.001 s À1 instead of the largest strain rate of 5.0 s À1 . Microstructure observation of specimens deformed at 0.001 s À1 and 1.0 s À1 of low-carbon bainite steel confirms that bainitic transformation induced by plastic deformation dominates the flow stress behavior of low-carbon bainite steel at strain rate from 0.001 to 1.0 s À1 . The present work provides the useful reference for the calculating of deformation force, setup of the deformation schedule, and safety check of processing equipment.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 90%

mentioning

confidence: 99%

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Effect of Strain Rate on Deformation Resistance during Ausforming in Fe–C–Mn–Si High‐Strength Bainite Steels

Chen

et al. 2018

steel research int.

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“…Due to their increased use, vehicle weight can be reduced without compromising both passenger safety and environmental requirements. Their application in the automotive industry is rapidly increasing mainly in the tailor welded blanks (TWBs) [5][6][7]. Two dissimilar steel sheets with different thicknesses can be integrated into TWBs to fit application before the blank goes through the forming process.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of fibre laser welded TRIP and HSLA steel sheets with different thicknesses

Švec¹,

Schrek²,

Dománková³

2020

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The microstructure of fibre laser welded joint of TRIP 690T and HSLA LAD340 steel sheets with different thicknesses was evaluated. The microstructure in the fusion zone was built of martensite, lower bainite and a small portion of upper bainite. Martensite and lower bainite created in both the coarse-grained and fine-grained heat affected zones (HAZs) near 690T steel, but some portion of ferrite was also identified in the fine-grained HAZ near 690T steel. Acicular ferrite, upper bainite, and equiaxed ferrite were observed in both the coarsegrained and fine-grained HAZs near LAD340 steel, but lower bainite was occasionally found in the coarse-grained HAZ near LAD340 steel. Creation of hard microconstituents caused an increase in microhardness values in the fusion zone and both HAZs compared to the base metals. The highest microhardness of 457 HV0.1 was measured in the coarse-grained HAZ near 690T steel with martensitic and lower bainitic microstructure.

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“…Recently, researches applied DIC device to measure the constitutive relationship of fusion zone during tensile tests [13][14][15][16]. Tong et al adopted DIC technique with redesigned miniature to measure the stress-strain curves of fusion zone in DP590 [17]. The miniature required complicated fix device and test procedures resulting in high expenditure.…”

Section: Introductionmentioning

confidence: 99%

Failure Mode Prediction of Resistance Spot Welded Quenching and Partitioning Steel

Luo

Zhang

2019

MATEC Web Conf.

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In recent years, a novel Advanced High-Strength Steels called quenching and partitioning (Q&P) steel has been applied in the automotive industry because its good combination of strength and ductility. In this study, an experimental setup by adopting digital image correlation (DIC) method was firstly developed to establish the constitutive relationship of fusion zone in the spot welds produced by Q&P980. Stress-strain relationship extracted from the tensile bar within the fusion zone and compared the results to that of base metal. The fusion zone of Q&P980 found to have a higher tensile strength and similar elongation compared with base metal. A numerical model established to predict the failure mode of joints generated by Q&P980 after obtaining the constitutive relationship of fusion zone. The predicted failure mode was in good coherence with the experimental results under the lap-shear test conditions. The developed FE model was proven efficient in tensile strength and failure mode characterization of spot welded specimen. This study could provide solutions to maintain or even improve vehicle crashworthiness of lightweight vehicle structures.

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The effect of the strain rate on the stress- strain curve and microstructure of AHSS

Cited by 54 publications

References 16 publications

Effect of Strain Rate on Deformation Resistance during Ausforming in Fe–C–Mn–Si High‐Strength Bainite Steels

Effect of Strain Rate on Deformation Resistance during Ausforming in Fe–C–Mn–Si High‐Strength Bainite Steels

Microstructure evolution of fibre laser welded TRIP and HSLA steel sheets with different thicknesses

Failure Mode Prediction of Resistance Spot Welded Quenching and Partitioning Steel

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