Influence of annealing time on microstructure and impact behavior of medium Mn-automotive steel

Sudipta Mohapatra; Suman Kumar; Adya Charan Arohi; Rururaja Pradhan; Bishnu Narayan Mahapatra; Min Suk Oh

doi:10.1016/j.matlet.2026.140832

Influence of annealing time on microstructure and impact behavior of medium Mn-automotive steel

Sudipta Mohapatra
, Suman Kumar
, Adya Charan Arohi
, Rururaja Pradhan
, Bishnu Narayan Mahapatra
, Min Suk Oh^*

^*Corresponding author for this work

Metallurgical System Engineering

Jeonbuk National University
Indian Institute of Technology Bombay

Research output: Contribution to journal › Journal article › peer-review

Abstract

The present investigation focuses on the microstructure evolution and impact behavior of Fe-9.42Mn-4.3Al-0.2C-1.27Si (wt%) steel subjected to thermomechanical processing following annealing at 750 °C for 60, 120, and 180 min. Electron backscatter diffraction analysis reveals the presence of a multi-phase microstructure consisting of blocky and lath-type γ-austenite, fine α-ferrite, and coarse δ-ferrite in all the samples. When exposed to the Charpy impact test, the sample annealed at 750 °C for 120 min displays the highest impact energy compared to others owing to the strong transformation-induced plasticity effect. To enhance the understanding of the micro-mechanism behind fracture, scanning electron microscopy is employed to analyze the fracture surface.

Original language	English
Article number	140832
Journal	Materials Letters
Volume	418
DOIs	https://doi.org/10.1016/j.matlet.2026.140832
State	Published - 2026.09.1

Keywords

Annealing time
Impact behavior
Medium manganese steel
Microstructure
Recrystallization
TRIP effect

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10.1016/j.matlet.2026.140832

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title = "Influence of annealing time on microstructure and impact behavior of medium Mn-automotive steel",

abstract = "The present investigation focuses on the microstructure evolution and impact behavior of Fe-9.42Mn-4.3Al-0.2C-1.27Si (wt\%) steel subjected to thermomechanical processing following annealing at 750 °C for 60, 120, and 180 min. Electron backscatter diffraction analysis reveals the presence of a multi-phase microstructure consisting of blocky and lath-type γ-austenite, fine α-ferrite, and coarse δ-ferrite in all the samples. When exposed to the Charpy impact test, the sample annealed at 750 °C for 120 min displays the highest impact energy compared to others owing to the strong transformation-induced plasticity effect. To enhance the understanding of the micro-mechanism behind fracture, scanning electron microscopy is employed to analyze the fracture surface.",

keywords = "Annealing time, Impact behavior, Medium manganese steel, Microstructure, Recrystallization, TRIP effect",

author = "Sudipta Mohapatra and Suman Kumar and Arohi, \{Adya Charan\} and Rururaja Pradhan and Mahapatra, \{Bishnu Narayan\} and Oh, \{Min Suk\}",

note = "Publisher Copyright: {\textcopyright} 2026 Elsevier B.V.",

year = "2026",

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doi = "10.1016/j.matlet.2026.140832",

language = "English",

volume = "418",

journal = "Materials Letters",

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TY - JOUR

T1 - Influence of annealing time on microstructure and impact behavior of medium Mn-automotive steel

AU - Mohapatra, Sudipta

AU - Kumar, Suman

AU - Arohi, Adya Charan

AU - Pradhan, Rururaja

AU - Mahapatra, Bishnu Narayan

AU - Oh, Min Suk

PY - 2026/9/1

Y1 - 2026/9/1

N2 - The present investigation focuses on the microstructure evolution and impact behavior of Fe-9.42Mn-4.3Al-0.2C-1.27Si (wt%) steel subjected to thermomechanical processing following annealing at 750 °C for 60, 120, and 180 min. Electron backscatter diffraction analysis reveals the presence of a multi-phase microstructure consisting of blocky and lath-type γ-austenite, fine α-ferrite, and coarse δ-ferrite in all the samples. When exposed to the Charpy impact test, the sample annealed at 750 °C for 120 min displays the highest impact energy compared to others owing to the strong transformation-induced plasticity effect. To enhance the understanding of the micro-mechanism behind fracture, scanning electron microscopy is employed to analyze the fracture surface.

AB - The present investigation focuses on the microstructure evolution and impact behavior of Fe-9.42Mn-4.3Al-0.2C-1.27Si (wt%) steel subjected to thermomechanical processing following annealing at 750 °C for 60, 120, and 180 min. Electron backscatter diffraction analysis reveals the presence of a multi-phase microstructure consisting of blocky and lath-type γ-austenite, fine α-ferrite, and coarse δ-ferrite in all the samples. When exposed to the Charpy impact test, the sample annealed at 750 °C for 120 min displays the highest impact energy compared to others owing to the strong transformation-induced plasticity effect. To enhance the understanding of the micro-mechanism behind fracture, scanning electron microscopy is employed to analyze the fracture surface.

KW - Annealing time

KW - Impact behavior

KW - Medium manganese steel

KW - Microstructure

KW - Recrystallization

KW - TRIP effect

UR - https://www.scopus.com/pages/publications/105037920390

U2 - 10.1016/j.matlet.2026.140832

DO - 10.1016/j.matlet.2026.140832

M3 - Journal article

AN - SCOPUS:105037920390

SN - 0167-577X

VL - 418

JO - Materials Letters

JF - Materials Letters

M1 - 140832

ER -

Influence of annealing time on microstructure and impact behavior of medium Mn-automotive steel

Abstract

Keywords

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