Micromechanisms of deformation in dual phase steels at high strain rates

Das, Anindya; Ghosh, Mainak; Tarafder, S.; Sivaprasad, S.; Chakrabarti, Debalay

doi:10.1016/j.msea.2016.10.101

Cited by 58 publications

(18 citation statements)

References 38 publications

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“…The frequencies of TCF and the RBF loading in the LCF regime are 2 and 20 Hz, respectively; thus, the orders of magnitude of the corresponding strain rates are 10 −2 and 10 −1 s −1 , respectively. It has been reported that for DP steels, the effect of strain rate sensitivity is small when strain rate is in the range of 10 −3 ≈1 s −1 . Thus, the effect of loading frequency on the LCF life is negligible.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Low‐Cycle Fatigue Life of Thin Dual‐Phase Steel Sheets for Automobiles Using Miniature Specimens

Zhang

Song

et al. 2019

steel research int.

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Using miniature 95 μm‐thick cantilever beam specimens, the fatigue life of a thin dual‐phase steel sheet is evaluated under deflection‐controlled repeatedly bending fatigue (RBF) loading and compared with that of 2 mm‐thick sheet specimens under strain‐controlled uniaxial tension‐compression fatigue (TCF) loading. The results indicate that the fatigue lives of the two types of specimens subjected to the respective two sorts of fatigue testing methods are almost identical in the low‐cycle fatigue (LCF) regime, whereas the fatigue life of the 95 μm‐thick foil specimens is much lower than that of the 2 mm‐thick sheet specimens in the high‐cycle fatigue regime. The fatigue performance and fracture mechanism under the two types of fatigue loadings are discussed and the application of this method using miniature cantilever beam specimens under RBF loading is further explored. The finding provides a potential way to obtain credible LCF data for vehicle steel sheets using miniature cantilever beam foils under RBF loading instead of TCF loading which becomes more difficult for the very thin steel sheets with a thickness less than 2 mm.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Low‐Cycle Fatigue Life of Thin Dual‐Phase Steel Sheets for Automobiles Using Miniature Specimens

Zhang

Song

et al. 2019

steel research int.

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“…It is related to the fact that large blocky-type grains of retained austenite were characterized by relatively low mechanical stability due to a lower carbon content. Moreover, blocky-type austenite possesses some fraction of microstructural defects, like dislocations and stacking faults which constitute the martensite nucleation zones [30]. Some reports [31][32][33] showed that film-type of retained austenite located at the bainitic islands is more beneficial due to the higher strength and steel toughness.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Analysis of Microstructure Evolution in Hot-Rolled Multiphase Steel Subjected to Interrupted Tensile Test

Grajcar

Kozłowska

Radwański

et al. 2019

Metals

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A quantitative analysis of the microstructure evolution in thermomechanically processed Si-Al multiphase steel with Nb and Ti microadditions was performed in the study. The tendency of strain-induced martensitic transformation of retained austenite was analyzed during a tensile test interrupted at incremental strain levels. Optical micrographs and electron backscatter diffraction (EBSD) maps were obtained at each deformation step. The quantitative analysis of the martensitic transformation progress as a function of strain was performed. The results showed that the stability of retained austenite is mostly related to its grain size and morphology. Large, blocky-type grains of retained austenite located in a ferritic matrix easily transformed into martensite during an initial step of straining. The highest mechanical stability showed small austenitic grains and thin layers located in bainitic islands. It was found that the extent of martensitic transformation decreased as the deformation level increased.

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“…Das et al [178,179] investigated the deformation behaviour of DP600 and DP800 grades of steel at varying strain rates from 10 −3 to 800 s −1 and found an increase in the yield strength and ultimate tensile strength for both DP600 and DP800 steel with the increase in the strain rate. It was observed that the rate of increase in the strength of these steels was higher in higher strain rate regimes (≥100 s −1 ) as compared to lower strain rates (shown in Figure 32).…”

Section: Dual-phase (Dp) Steel and Micro-alloyed Steelmentioning

confidence: 99%

“…The effects of microstructure on the strain-rate deformation behaviour of DP steels have been carried out by many researchers [175,178,[181][182][183]. Anderson [175] reported the presence of dimples and shear lips along with the formation of transverse cracks of DP800 steel when subjected to varying strain rates.…”

Section: Dual-phase (Dp) Steel and Micro-alloyed Steelmentioning

confidence: 99%

Structure–Property Correlation and Constitutive Description of Structural Steels during Hot Working and Strain Rate Deformation

Prusty

Banerjee

2020

Materials

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The behaviour of plain carbon as well as structural steels is qualitatively different at different regimes of strain rates and temperature when they are subjected to hot-working and impact-loading conditions. Ambient temperature and carbon content are the leading factors governing the deformation behaviour and substructural evolution of these steels. This review aims at investigating the mechanical behaviour of structural (or constructional) steels during their strain rate (ranging from very low to very high) as well as hot-working conditions and subsequently establishing the structure–property correlation. Rate-dependent constitutive equations play a significant role in predicting the material response, particularly where the experiments are difficult to perform. In this article, an extensive review is carried out on the merits and limitations of constitutive models which are commonly used to model the deformation behaviour of plain carbon steels.

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Micromechanisms of deformation in dual phase steels at high strain rates

Cited by 58 publications

References 38 publications

Evaluation of the Low‐Cycle Fatigue Life of Thin Dual‐Phase Steel Sheets for Automobiles Using Miniature Specimens

Evaluation of the Low‐Cycle Fatigue Life of Thin Dual‐Phase Steel Sheets for Automobiles Using Miniature Specimens

Quantitative Analysis of Microstructure Evolution in Hot-Rolled Multiphase Steel Subjected to Interrupted Tensile Test

Structure–Property Correlation and Constitutive Description of Structural Steels during Hot Working and Strain Rate Deformation

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