Influence of intercritical annealing temperature on microstructure, microtexture, and tensile behavior of TRIP-assisted medium manganese steel

Mohapatra, Sudipta; Mandal, Arka; Poojari, Govardhana; Das, Siddhartha; Das, Karabi

doi:10.1016/j.mtla.2023.101781

Cited by 13 publications

(2 citation statements)

References 76 publications

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“…However, the volume percentage of austenite in A_850 (53 vol%) was lower than that of A_800 (~60 vol%). This was presumably due to the reduced availability of Mn and C in austenite at higher IA temperatures (850 °C) and the transformation of a certain amount of austenite (formed during IA at 850 °C) to ferrite during cooling from 850 °C to ambient temperature [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…Specifically, the maximum intensity increased from ~8.6R for A_750 to ~11.7R for A_800. Increasing the annealing temperature resulted in the activation of a greater number of potential sites for nucleation [ 54 ], which consequently increased the probability of recrystallization. Therefore, grains with a high degree of independent orientation were formed in A_850.…”

Section: Resultsmentioning

confidence: 99%

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Intercritically Annealed Medium-Manganese Steel: Insights into Microstructural and Microtextural Evolution, Strain Distribution, and Grain Boundary Characteristics

Mohapatra,

Baek,

2024

Materials

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Aluminum-incorporated medium-manganese steel (MMnS) has potential for lightweight transport applications owing to its impressive mechanical properties. Increasing the austenite volume fraction and making microstructural changes are key to manufacturing MMnS. However, the grain boundary character and strain distribution of intercritically annealed low-density MMnS have not been extensively scrutinized, and the effects of crystallographic texture orientation on tensile properties remain ambiguous. Therefore, in this study, the microstructure, microtexture, strain distribution, and grain boundary characteristics of a hot-rolled medium-Mn steel (Fe–0.2 C–4.3 Al–9.4 Mn (wt%)) were investigated after intercritical annealing (IA) at 750, 800, or 850 °C for 1 h. The results show that the 800 °C annealed sample exhibited the highest austenite volume fraction among the specimens (60%). The duplex microstructure comprised lath-type γ-austenite, fine α-ferrite, and coarse δ-ferrite. As the IA temperature increased, the body-centered cubic phase orientation shifted from <001> to <111>. At higher temperatures, the face-centered cubic phase was oriented in directions ranging from <101> to <111>, and the sums of the fractions of high-angle grain boundaries and coincidence–site–lattice special boundaries were significantly increased. The 800 °C annealed sample with a high austenite content and strong γ-fiber {111}//RD orientation demonstrated a noteworthy tensile strength (1095 MPa) and tensile elongation (30%).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Intercritically Annealed Medium-Manganese Steel: Insights into Microstructural and Microtextural Evolution, Strain Distribution, and Grain Boundary Characteristics

Mohapatra,

Baek,

2024

Materials

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Effect of Partition Temperature on Microstructure and Mechanical Properties of Cold‐Rolled Medium‐Manganese Steel

Zhu,

Ren,

Jing

et al. 2024

steel research int.

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The influence of different heat‐treatment conditions on the microstructure evolution and mechanical properties of cold‐rolled Fe–7.69Mn–2.76Al–0.12C (wt%) steel is investigated using various techniques, including scanning electron microscopy, transmission electron microscopy (TEM), and X‐ray diffraction. In the results, it is shown that the stability of austenite is significantly affected by different partitioning temperatures. It is found that factors such as dislocation density, temperature, and grain size collectively influence partitioning behavior. In the observations, it is revealed that when the partitioning temperature is raised from 120 to 180 °C, the dislocation density of the face centered cubic phase within the test steel decreases from 10.38 × 1016 to 7.67 × 1016 m−2. Additionally, within specimens exhibiting higher dislocation densities, carbon element diffusion is more uniform. During the experiment, the poor stability of the austenite is found to be susceptible to stress‐inducing the phase of the martensitic transformation, and the type of the martensite transformation affects the deformation process and the performance of submission behavior. In the observations under TEM, a phenomenon where variations in dislocation density within individual austenite grains may lead to differing stability across grain regions is revealed, thereby triggering localized martensitic phase transformations.

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A Comprehensive Study on the Effect of Annealing Temperature on the Tensile and Impact Behavior of Automotive-Grade Medium Manganese Steel (Fe-6.22Mn-0.18C)

Mohapatra,

Poojari,

Satpathy

et al. 2023

J. of Materi Eng and Perform

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Influence of intercritical annealing temperature on microstructure, microtexture, and tensile behavior of TRIP-assisted medium manganese steel

Cited by 13 publications

References 76 publications

Intercritically Annealed Medium-Manganese Steel: Insights into Microstructural and Microtextural Evolution, Strain Distribution, and Grain Boundary Characteristics

Intercritically Annealed Medium-Manganese Steel: Insights into Microstructural and Microtextural Evolution, Strain Distribution, and Grain Boundary Characteristics

Effect of Partition Temperature on Microstructure and Mechanical Properties of Cold‐Rolled Medium‐Manganese Steel

A Comprehensive Study on the Effect of Annealing Temperature on the Tensile and Impact Behavior of Automotive-Grade Medium Manganese Steel (Fe-6.22Mn-0.18C)

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