Effect of Intercritical Thermomechanical Processing on Austenite Retention and Mechanical Properties in a Multiphase TRIP-Assisted Steel

Mohamadizadeh, Alireza; Zarei-Hanzaki, A.; Mehtonen, Saara; Porter, David; Moallemi, Mohammad

doi:10.1007/s11661-015-3213-9

Cited by 11 publications

(8 citation statements)

References 41 publications

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“…Using this method enables us to analyze the individual peaks, which allows to take into account the texture effects, at the same time minimizing background noise. This method is often applied to determine the retained austenite in TRIP-assisted steels [7,[12][13][14]. Another method applied for TRIP steels is the Rietveld method [25].…”

Section: Methodsmentioning

confidence: 99%

“…In order to improve the mechanical properties of steels with a TRIP (TRansformation Induced Plasticity) effect, microadditions of Nb and Ti can be also added [11]. The influence of bainitic transformation conditions on the microstructure consisting of ferrite, bainite, and retained austenite have been analyzed by many authors [12][13][14]. Garcia-Mateo et al [15,16] analyzed the factors affecting the stability of retained austenite in nanostructured bainitic steels.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Temperature and Time of Isothermal Holding on Retained Austenite Stability in Medium-Mn Steels

2018

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Effects of isothermal holding time and temperature on the stability of retained austenite in medium manganese bainitic steels with and without Nb microaddition were investigated. The amount of retained austenite for various variants of thermomechanical processing was determined by X-ray diffraction. Relationships between processing conditions and microstructure were revealed using light microscopy and scanning electron microscopy techniques. The isothermal holding temperatures changed from 500 to 300 °C and the time was from 60 to 1800 s. The optimal time and temperature of isothermal holding for all the investigated steels were 400 °C and 300 s, respectively. The relationships between the Mn content, amount of retained austenite, and carbon enrichment of the retained austenite (RA) were observed. The noticeable effect of Nb microaddition on the amount of retained austenite was not observed. In general, the carbon content in RA was slightly lower for the steels containing Nb. The optimum gamma phase amount was up to 18% for the 3% Mn steels, whereas it was c.a. 13% for the steels with 5% Mn. It was found that the morphology of blocky/interlath retained austenite depends substantially on the isothermal holding temperature.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Temperature and Time of Isothermal Holding on Retained Austenite Stability in Medium-Mn Steels

2018

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“…This kind of flow behavior is typically related to the occurrence of dynamic recrystallization (DRX). According to the previous studies, the occurrence of DRX is likely to happen in case of other similar boron steels under similar deformation conditions …”

Section: Resultsmentioning

confidence: 80%

Optimum Deformation Criteria and Flow Behavior Description of Boron-Alloyed Steel through Numerical Approach

Hamtaei

Zarei-Hanzaki

Mohamadizadeh

2016

steel research int.

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The capability of a phenomenological, a physical-based, and a restoration-based model in flow behavior description has been evaluated comparatively to determine the optimum high-temperature deformation condition for a boron-alloyed steel. For this purpose, the hot compression tests are performed over wide ranges of strain rate and temperature. The modified Zerilli-Armstrong model is found to be simple and handy for flow modeling since it employs less material constants compared to the other models. The strain-compensated Arrhenius constitutive equation is accurate and can be used to predict the flow behavior of similar alloys over a wide range of deformation temperatures. The restoration-based constitutive analysis is the most accurate approach for flow modeling because it takes different stages of deformation into account separately. Finally yet importantly, the experimental data are used to develop the efficiency maps and the optimum processing domains are determined.

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“…An Averbach-Cohen method was used in order to determine the amount of retained austenite depending on the deformation temperature. This method is commonly applied to determine the retained austenite in TRIP-assisted steels [17,21,23].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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The study addressed the microstructure and mechanical properties of hot-rolled advanced high-strength medium manganese steel. Some of the curves that were obtained in static tensile tests at deformation temperatures of 20–200 °C showed the occurrence of the heterogeneous plastic deformation phenomenon, called the Portevin-Le Chatelier (PLC) effect. The deformation temperature significantly influenced a serration character. The correlations between the deformation temperature, serration range, microstructural features, and fracture behavior were investigated. The curves showed no Lüders elongation as a result of the thermomechanical processing applied. The serrated flow phenomenon was observed at 60 and 140 °C. The serration type was different and the most enhanced at 140 °C, where the PLC effect was present in both uniform and post-uniform elongation ranges. The disappearance of serrations at 200 °C was related to the increased diffusion intensity.

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Effect of Intercritical Thermomechanical Processing on Austenite Retention and Mechanical Properties in a Multiphase TRIP-Assisted Steel

Cited by 11 publications

References 41 publications

Effects of Temperature and Time of Isothermal Holding on Retained Austenite Stability in Medium-Mn Steels

Effects of Temperature and Time of Isothermal Holding on Retained Austenite Stability in Medium-Mn Steels

Optimum Deformation Criteria and Flow Behavior Description of Boron-Alloyed Steel through Numerical Approach

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

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