The influence of grain size and precipitation and a boron addition on the hot ductility of a high Al, V containing TWIP steels

Mintz, B.; Kang, S. E.; Qaban, Abdullah

doi:10.1080/02670836.2021.1975876

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…13d). It can be stated that according to the literature, a vanadium addition increases the deformability [32]; however, the results presented in the literature are ambiguous. For the higher strain rates, this relation becomes reversed and for the steel with the vanadium addition, when it is in a solid solution, the deformability becomes reduced.…”

Section: Temperature Measurement Resultsmentioning

confidence: 97%

The influence of the heat generation during deformation on the mechanical properties and microstructure of the selected TWIP steels

et al. 2023

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The TWIP (Twinning Induced Plasticity) steels are one of the most promising materials in reducing the weight of vehicles. Despite a lot of research on TWIP steel, there are some issues that are not explained enough. Due to the future use of TWIP steel and the manufacturing of the final part by metal forming, three issues still need to be clarified. The first one, which is the most important, is the increase of the temperature due to the conversion of the deformation work into heat. TWIP steel has a high limit strain, strength and lower conductivity than conventional steel, therefore the heat generation of TWIP steel is greater than for other materials. The second and third issues are combined. They concern the influence of V microadditions on the stress–strain curves, the strain hardening coefficient n and the strain rate sensitivity coefficient m under cold deformation conditions. These properties determine the cold formability of TWIP steels. In the research, two TWIP steels were used with and without V microadditions (MnAl and MnAl-V steel). The special methodology using strain and temperature measurement systems as well as light and scanning electron microscopy (SEM) were applied. Research shows a significant increase of the temperature in the material due to high plastic deformations as well as a high level of yield stress. In the neck area, for the highest strain rate of 0,1 s -1, at the moment of rupture, the temperature reaches more than 200 °C. The difference between the average temperature in the rupture area and the maximum temperature is equal to 100° C. Its high increase can lead e.g. to changes in the deformation mechanism from twinning to dislocation gliding, which is also connected with a worsened workability, and thus also energy consumption of the bodywork elements. MnAl-V steel has better or similar ductility for the deep drawing in comparison to MnAl steel at low strain rates for almost isothermal conditions (constant temperature during deformation). However the MnAl steel has better ductility for the larger strain rates over 0.1 s−1 then there is large heat concentration in a very narrow area for MnAl-V steel. The obtained results are very important from an application point of view. The strain rate sensitivity coefficient m of the steel MnAl has very low, and even negative, values, which can make the production of complicated drawpieces difficult. Higher values of the strain rate sensitivity coefficient are exhibited by steel MnAl-V, i.e. at the level of 0,05, which is almost constant in the whole range of the obtained deformations.

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Section: Temperature Measurement Resultsmentioning

confidence: 97%

The influence of the heat generation during deformation on the mechanical properties and microstructure of the selected TWIP steels

et al. 2023

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“…On the other hand, the carbide precipitates could also provoke a loss of the hot ductility of steels by themselves, as reported by many published works [21][22][23][24][25][26]. The precipitates at grain boundaries reduce the binding force of grain boundaries, retard the onset of dynamic recrystallization and cause stress concentration, thus promoting intergranular failure and reducing hot ductility.…”

Section: Effect Of V Content On Hot Ductilitymentioning

confidence: 99%

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

Song

Tian

Xiao³

et al. 2021

Metals

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Hot tensile tests were conducted in this study to investigate the effect of strain rate (10−3 and 10 s−1) and vanadium content (0.029 and 0.047 wt.%) on the hot ductility of low-carbon microalloyed steels. The results indicate that a hot ductility trough appears at a low strain rate (10−3 s−1) because of the sufficient time for ferrite transformation and the growth of second particles, but it disappears at a high strain rate (10 s−1). The hot ductility is improved with the increase in strain rate at 700 °C or higher temperatures. In addition, with the increase in vanadium content, the large amounts of precipitate and increased ferrite transformation result in poor hot ductility of steels fractured at a low temperature range (600~900 °C). However, when the steel is fractured at a high temperature range (1000~1200 °C), more vanadium in the solid solution in the austenite inhibits the growth of parental austenite grains and results in grain refinement strengthening, slightly improving the hot ductility.

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“…Such a mechanism involves the mutual rearrange ment of crystal lattices between adjacent fragments at angles that will be proportional to the accumulated density of dislo cations. The specified distortions of the crystal lattice of the austenite should be sufficient to violate conditions for the for mation of a pearlite colony, at cooling after full annealing [9,12]. As a result, the size fragment at austenite grain should influence the growth of the pearlite colony.…”

Section: Solid State Physics Mineral Processingmentioning

confidence: 99%

Influence of hot plastic deformation on properties of the carbon steel

Vakulenko,

Plitchenko

2024

Nauk. visn. nat. hirn. univ.

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Purpose. Determination of the influence of hot plastic deformation degree on the set of carbon steel properties. Methodology. Steel with 0.6 % carbon was used for the study. The steel structure corresponded to the state after compression at 1,240 °C. Mechanical properties were determined by the tensile curve, friction stress of the ferrite crystal lattice and resistance of interphase boundary pearlite to propagation of deformation were estimated. Findings. Depending on the structural state of austenite, dispersion of pearlite colonies is accompanied by different rates of change in the properties of carbon steel. For pearlite formed from austenite after annealing, the strain hardening coefficient and maximum ductility are inversely proportional. For pearlite formed from austenite with preserved substructure after hot deformation, the strain hardening coefficient and maximum ductility are related through the proportional relationship. Originality. Preservation of the substructure of hot-deformed austenite affects propagation deformation in pearlite of the steel. Against the background of decreasing friction stress of the ferrite crystal lattice, there is an increase in resistance of ferrite-cementite boundary of the pearlite to the spread of deformation. Practical value. For carbon steels with a pearlite structures, the accelerated increase in ductility from maintaining the proportion of hot work hardening of the austenite will improve technology for manufacturing rolled products of large sections. When producing thermally strengthened rolled products, achieving a simultaneous increase in strength and plastic properties is ensured by increasing ability of metal to strain hardening.

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The influence of grain size and precipitation and a boron addition on the hot ductility of a high Al, V containing TWIP steels

Cited by 8 publications

References 18 publications

The influence of the heat generation during deformation on the mechanical properties and microstructure of the selected TWIP steels

The influence of the heat generation during deformation on the mechanical properties and microstructure of the selected TWIP steels

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

Influence of hot plastic deformation on properties of the carbon steel

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