Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

Kozłowska, Aleksandra; Grzegorczyk, B.; Staszuk, M.; Nuckowski, Paweł M.; Grajcar, A.

doi:10.3390/ma12244184

Cited by 4 publications

(8 citation statements)

References 43 publications

(94 reference statements)

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“…An increase in deformation temperature to 140 °C results in an increase in the oscillation amplitude and an increase in the extent of deformation in which they occurred. Above the 0.08 strain value, B + C oscillations were observed [21]. In the case of the sample deformed at 200 °C, no evidence of PLC phenomenon was observed.…”

Section: Mechanical Propertiesmentioning

confidence: 84%

“…In the case of samples deformed at 100 °C and 140 °C, the oscillations were observed at the final stage of deformation above the uniform deformation range. The type of oscillations observed in the sample deformed at 100 °C was classified as type B [21]. An increase in deformation temperature to 140 °C results in an increase in the oscillation amplitude and an increase in the extent of deformation in which they occurred.…”

Section: Mechanical Propertiesmentioning

confidence: 98%

“…The C content also prevents probability of the Portevin-Le Chatelier (PLC) effect, which is known especially for the 5-10 wt% Mn TRIP steels [21]. The reduced manganese content makes it a cheaper solution than the high-Mn steels or medium-Mn steels containing 8-12 wt% Mn [22].…”

Section: Materials and Thermomechanical Processingmentioning

confidence: 99%

“…An increase in deformation temperature to 60 °C caused the appearance of the PLC effect in the early stage of plastic deformation. The observed oscillations were classified as type A according to [21]. The serrations were characterized by a small amplitude, and they occurred in a range of uniform elongation.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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

Kozłowska

Radwański

Matus

et al. 2021

Archiv.Civ.Mech.Eng

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The thermal and mechanical stabilities of retained austenite in aluminum-containing medium-Mn 0.16C–4.7Mn–1.6Al–0.2Si sheet steel were investigated. The strain-induced martensitic transformation in Mn TRIP steel was studied at different temperatures. Static tensile tests were carried out at the temperature ranging from − 60 to 200 °C. The tests allowed to study the influence of the temperature on austenite-to-martensite transformation kinetics. The interrupted tensile tests and corresponding X-ray measurements of retained austenite amount were performed to determine the mechanical stability of retained austenite using the Sugimoto model. The microstructure changes were investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. Observed results reflected the effects of deformation temperature on the mechanical stability of retained austenite and the corresponding response of this phase to martensitic transformation. It was found that an increase in the deformation temperature resulted in the reduced intensity of the TRIP effect due to the higher mechanical stability of retained austenite. At the highest deformation temperature (200 °C), the evidence of thermally activated processes affecting the mechanical behavior was identified.

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Section: Mechanical Propertiesmentioning

confidence: 84%

Section: Mechanical Propertiesmentioning

confidence: 98%

Section: Materials and Thermomechanical Processingmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

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

Kozłowska

Radwański

Matus

et al. 2021

Archiv.Civ.Mech.Eng

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“…It is based on the austenite reverted transformation (ART) process [ 11 , 12 ], which allows the producing of lath-like duplex microstructures. It is used both for hot-rolled [ 13 , 14 , 15 ] and cold-rolled [ 16 , 17 ] sheet steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hot Deformation on Phase Transformation Kinetics in Isothermally Annealed 3Mn-1.6Al Steel

et al. 2020

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The kinetics of ferritic transformation and the corresponding microstructural evolution in 0.17C-3.1Mn-1.6Al-0.04Nb-0.22Mo-0.22Si medium-Mn steel during isothermal annealing was investigated in dilatometric studies. The material was subjected to thermal and thermo-mechanical treatments aimed at obtaining, by the austenite → ferrite transformation, a sufficient fraction of ferrite to stabilize the retained austenite by C and eventual Mn partitioning. The samples were isothermally held for 5 h in a temperature range from 600 to 750 °C to simulate simplified temperature conditions of an industrial coiling process following hot rolling. Some of the samples were plastically deformed at a temperature of 900 °C before isothermal holding in order to study the effect of hot deformation on the kinetics of phase transformations. After the dilatometric investigations the material was subjected to light and scanning electron microscopy to reveal relationships between the holding temperature, deformation and microstructure evolution. Hardness tests were performed to assess the mechanical behavior. A significant effect of manganese in slowing down diffusional transformations during the cooling of steel was found. The influence of austenite deformation on the kinetics of austenite to ferrite transformation was noted. The plastically deformed samples showed an accelerated start of ferritic transformation and the extension of its range. During dilatometric tests, low-range dynamic ferritic transformation was recorded, which was also confirmed by the microscopic tests.

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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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Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

Cited by 4 publications

References 43 publications

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

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

Effect of Hot Deformation on Phase Transformation Kinetics in Isothermally Annealed 3Mn-1.6Al Steel

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

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