Mechanical stability of retained austenite in aluminum-containing medium-Mn steel deformed at different temperatures

Kozłowska, Aleksandra; Radwański, Krzysztof; Matus, Krzysztof; Samek, Ludovic; Grajcar, A.

doi:10.1007/s43452-021-00177-8

Cited by 13 publications

(9 citation statements)

References 57 publications

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“…The high-resolution TEM image shows the presence of moire fringes (Fig. 5f), which indicate the occurrence of earlystage subgrain formation- Kozłowska et al (2021). An increased number of globular grains with a diameter below 1 μm in the sample deformed at 140°C (Fig.…”

Section: Resultsmentioning

confidence: 94%

Temperature-Stimulated Morphological Features of Advanced High-Strength Medium-Mn TRIP Steel

et al. 2022

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Advanced High-Strength Steels (AHSSs) are one of the most rapidly developing group of Fe-based metallic materials. Their excellent combination of high strength, ductility and formability is due to their complex microstructure and strain-induced martensitic transformation of metastable retained austenite (RA), which favors extra ductility of the sheet steels. A deformation temperature is one of the most important factors affecting the phase transformation behavior in these Fe–C–Mn–Al–Si systems. Therefore, the present study aimed at understanding the temperature-dependent phase transformations and structural phenomena in an advanced medium-Mn–Al-alloyed steel. The 3Mn steel was thermomechanically processed and subjected to tensile testing in a temperature range from 20°C to 200°C. The different extent of the strain-induced martensitic transformation and some softening phenomena of bainitic ferrite matrix were revealed using transmission electron microscopy and electron backscatter diffraction techniques. It was found that the thermal stability of RA is strongly dependent on the deformation temperature. Moreover, the dynamic recovery and carbide precipitation play a key role when the deformation temperature is increased to 140°C and higher temperatures.

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Section: Resultsmentioning

confidence: 94%

Temperature-Stimulated Morphological Features of Advanced High-Strength Medium-Mn TRIP Steel

et al. 2022

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“…The concept of a steel with the so called twinning induced plasticity (TWIP) effect was proposed for the first time by Grassel and Fromayer [4]. During the analysis of steel with 15 and 25% of Mn content, the authors established that the unique combination of high mechanical properties and high ductility is determined by the mechanical twins formation in the austenitic grains [5]. The same authors proved that TWIP steel with an advantageous combination of mechanical and plastic properties should contain the amount of manganese within the range of 20% wt.…”

Section: Introductionmentioning

confidence: 99%

Specific behavior of high-manganese steels in the context of temperature increase during dynamic deformation

Jabłońska

2023

Materials Research Proceedings

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Abstract. In recent years, a development of AHSS steels for manufacturing parts for the automotive industry is the observed trend. The high-manganese steels with aluminium and silicon addition, exhibiting twinning induced plasticity (TWIP) effect, are one of the most interesting modern materials, due to their unique combination of both very good strength and great ductility. However, the material behaviour during plastic deformation depends not only on the chemical composition but also on deformation conditions, inter alia, strain rate and temperature. TWIP steels can be used for production of energy-absorbing parts, therefore it is very important to analyse their deformation behaviour at high strain rates. The paper presents the effect of deformation in quasi-static and dynamic conditions on the microstructure of an experimental TWIP steel. The experiments were performed on tensile testing machine and on the flywheel machine. The microstructure was analyzed by optical and scanning transmission electron microscopy. Thanks to the measurements during the quasi-static test and numerical simulations of both tensile tests, the temperature increase was determined in the sample region from which the sections for microstructural studies were taken. It was found that the temperature increase in dynamic conditions can affect the microstructure evolution in the investigated TWIP steel.

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“…On the other hand, an increase of hot ductility in the TWIP steel with vanadium, in comparison to TWIP steel with a similar composition but without vanadium, in the temperature range of 800-900 °C, was observed. The largest limit strain results from the onset of dynamic recrystallization [18]. Reyes-Calderon et al [8] studied the influence of microalloying elements such as V, Ti and Nb on hot formability of a highmanganese TWIP steel.…”

Section: Introductionmentioning

confidence: 99%

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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Mechanical stability of retained austenite in aluminum-containing medium-Mn steel deformed at different temperatures

Cited by 13 publications

References 57 publications

Temperature-Stimulated Morphological Features of Advanced High-Strength Medium-Mn TRIP Steel

Temperature-Stimulated Morphological Features of Advanced High-Strength Medium-Mn TRIP Steel

Specific behavior of high-manganese steels in the context of temperature increase during dynamic deformation

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

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