Ultra-fine grained structure formation through deformation-induced ferrite formation in duplex low-density steel

Mohamadizadeh, Alireza; Zarei-Hanzaki, A.; Kisko, A.; Porter, David

doi:10.1016/j.matdes.2015.12.040

Cited by 32 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…have illustrated that the effects of deformation parameters on the activation energy evolution of Fe-18Mn-8Al-0.8C steel. Hamada et al investigated hot deformation behavior of Fe-20Mn-1.5Al-0.8C steel by the physically based modeling [13][14][15]. As we know, Al is the major alloying elements of the present alloy, and Al plays a significant role on the ferrite stabilizer.…”

Section: Introductionmentioning

confidence: 99%

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Tang

Chen

et al. 2019

Vacuum

View full text Add to dashboard Cite

The effect of Al content on the hot deformation behavior of high-Mn low density Fe-Mn-Al-C steels was investigated by the 3D processing map at the temperatures of 850-1050 °C and the strain rates of 0.001-10s-1. The high-Al steel showed a higher flow stress and a greater activation energy (443 kJ/mol) in contrast to the low-Al steel (394 kJ/mol). The microstructures of 8Al steel and 10Al steel depends on the deformation parameters. The initial hot rolling microstructure has been displaced by the recrystallized structure and substructures for both steels, while the unstable zone has deformation bands and flow localization. As the Z content increases with increasing Al content, this leads to a significant inhibition of the DRX process, resulting in an unstable domain with deformation zones and flow localization. For high-Al steel, the morphology and distribution of ferrite transform from the continuous band ferrite to discontinuous granular ferrite, moreover, the flow localization features cannot be observed with the decrease of strain rate to 0.001s-1. Furthermore, the proportion of instability region for each of the strains increases with the increasing of the Al content, the high Al content weakens the workability of the Fe-Mn-Al-C steels.

show abstract

Section: Introductionmentioning

confidence: 99%

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Tang

Chen

et al. 2019

Vacuum

View full text Add to dashboard Cite

show abstract

“…In situations that mechanical properties can be controlled by the prior austenite size and phase transformation, hot deformation processes applied to promote ferrite and pearlite transformation has been investigated . Mohanmadizadeh et al studied grain refinement mechanism of deformed austenite, and explained that the accumulation of stored deformation energy inside micro‐shear bands led to ultra‐fine austenite grains (UFAG) with an average size of 1.8 µm . It was concluded that the size of austenite affected the effective grain boundary area and significantly influenced ferrite and pearlite nucleation .…”

Section: Introductionmentioning

confidence: 99%

“…Ok and Chung et al investigated the mechanism of two types of deformation‐induced phase transformation as massive transformation and conventional strain‐induced transformation when the low carbon steel was deformed in (γ + α) region at low strain rate . The main purposes of DIFT were on obtaining excellent mechanical properties such as strength, ductility and toughness . However, heat treatment and surface carburization after machining are usually adopted for good performance in gear industry, whereas rolling industry is more concerned about the machinability of gear steel bars, which implies optimum hardness for easy machining.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness Evolution during Deformation near Ae₃ in a Cr–Mn–Ti Gear Steel

Xi-nan

Meng

et al. 2018

steel research int.

View full text Add to dashboard Cite

Developing appropriate thermomechanical processing routes for decreasing macrohardness of gear steels without heat treatment has a numerous futuristic applications in rolling industry. The effect of different deformation processes applied to Cr–Mn–Ti gear steel on the evolution of microstructure and hardness are studied by using a thermal simulator. It is found that imposing second‐pass deformation near Ae3 temperature inhibits occurrence of dynamic recrystallization (DRX), and increases stored deformation energy in austenite, which significantly promotes ferrite and pearlite transformation. As a result, the maximum volume fraction of ferrite and pearlite approaches ≈90%, and the corresponding macrohardness decreases to ≈215 HV. The difference of ferrite transformation between different deformation processes is analyzed using a thermodynamic equation by taking into account the stored deformation energy. The present calculations indicate that interval between Ae3 and deformation temperature can only be avoided at lower deformation temperature of second‐pass. This restricts static recovery or recrystallization, and quantities of dislocations that act as nucleation sites are retained before ferrite transformation.

show abstract

“…The maximum efficiency is calculated to be about 29% at the true strain of 0.18 which gradually increases to 37% at true strain of 0.42. Based on previous studies, the deformation‐induced transformation of austenite to ferrite at this condition is expected. The higher amount of deformation‐stored energy at relatively low temperatures and higher strain rates may well provide the necessary driving force for the aforementioned transformation …”

Section: Resultsmentioning

confidence: 72%

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

Hamtaei

Zarei-Hanzaki

Mohamadizadeh

2016

steel research int.

View full text Add to dashboard Cite

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.

show abstract

Ultra-fine grained structure formation through deformation-induced ferrite formation in duplex low-density steel

Cited by 32 publications

References 37 publications

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Microstructure and Hardness Evolution during Deformation near Ae₃ in a Cr–Mn–Ti Gear Steel

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

Contact Info

Product

Resources

About

Ultra-fine grained structure formation through deformation-induced ferrite formation in duplex low-density steel

Cited by 32 publications

References 37 publications

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Exploring the influence of Al content on the hot deformation behavior of Fe-Mn-Al-C steels through 3D processing map

Microstructure and Hardness Evolution during Deformation near Ae3 in a Cr–Mn–Ti Gear Steel

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

Contact Info

Product

Resources

About

Microstructure and Hardness Evolution during Deformation near Ae₃ in a Cr–Mn–Ti Gear Steel