Impact of Non-Metallic Inclusions and Grain Structures Modified by Fast Heating Annealing on Tensile Properties of a V-Microalloyed High-Mn TWIP Steel

Abstract:

Characterization, classification, and size distribution of non-metallic inclusions (NMIs) in a cast high-Mn TWIP steel (Fe-20Mn-0.6C-1.5Al-0.3V, in wt.%), were studied to explore their interplay with the fracture mode during tensile deformation. NMIs were separated by electrochemical extraction, and subsequent X-ray dispersive analysis was performed to characterize their compositions. Subsequently, 70 % cold rolled TWIP sheets were processed and undergone fast heating annealing (FHA) at a heating rate of 200°C/s to anneal at temperatures 750 - 850 °C for 30 s. The grain structures achieved by FHA were evaluated by EBSD. The mechanical properties were determined by tensile testing. Distinct categories of NMIs, including Al2O3 and Mn (S,Se), and (Ti,V)N nitrides, and intricate combinations of inclusions, were identified. FHA process at low temperatures, 750-800 °C, promoted partially recrystallized microstructures. Fully recrystallized structures were obtained at 850 °C characterized by an average grain size of 2 µm at 850 °C. The structure promoted at FA 850 °C displayed noteworthy elongation of 60% with a yield strength (YS) and tensile strength (TS) of 410 and 830 MPa, respectively. A minimal effect of NMIs in TWIP steel was observed due to activating mechanical twinning mechanism, which overcomes the detrimental impact of NMIs and retard the necking induced by void formation related to NMIs.

• Periodical: Solid State Phenomena (Volume 383)
• Pages: 19-24
• DOI: https://doi.org/10.4028/p-78sxvC
• Online since: January 2026
• Authors: Atef Saad Hamada*, Tuomas Alatarvas, Matias Jaskari, Antti Järvenpää
• Keywords: Fast Annealing, High-Mn TWIP Steel, Mechanical Properties, Microstructure, Non-Metallic Inclusions

References

[1] O. Güvenç, F. Roters, T. Hickel, M. Bambach, ICME for Crashworthiness of TWIP Steels: From Ab Initio to the Crash Performance, JOM. 67 (2015) 120–128.

DOI: 10.1007/s11837-014-1192-8

[2] J. Zhao, Z. Jiang, Thermomechanical processing of advanced high strength steels, Prog. Mater. Sci. 94 (2018) 174–242.

[3] A.L.V. Da Costa E Silva, The effects of non-metallic inclusions on properties relevant to the performance of steel in structural and mechanical applications, J. Mater. Res. Technol. 8 (2019) 2408–2422.

DOI: 10.1016/j.jmrt.2019.01.009

[4] G. Gigacher, W. Krieger, P.R. Scheller, C. Thomser, Non-Metallic Inclusions in High-Manganese-Alloy Steels, Steel Res. Int. 76 (2005) 644–649.

DOI: 10.1002/srin.200506069

[5] G. Gigacher, R. Pierer, J. Wiener, C. Bernhard, Metallurgical aspects of casting high-manganese steel grades, Adv. Eng. Mater. 8 (2006) 1096–1100.

DOI: 10.1002/adem.200600152

[6] C. Zhuang, J. Liu, Z. Mi, H. Jiang, D. Tang, G. Wang, Non-Metallic Inclusions in TWIP Steel, Steel Res. Int. 85 (2014) 1432–1439.

DOI: 10.1002/srin.201300354

[7] Y.-N. Wang, Solidification Structure, Non-metallic Inclusions and Hot Ductility of Continuously Cast High Manganese TWIP Steel Slab, ISIJ Int. 59 (2019) 872–879.

DOI: 10.2355/isijinternational.isijint-2018-694

[8] Y.N. Wang, J. Yang, R.Z. Wang, X.L. Xin, L.Y. Xu, Effects of Non-metallic Inclusions on Hot Ductility of High Manganese TWIP Steels Containing Different Aluminum Contents, Metall. Mater. Trans. B Process Metall. Mater. Process. Sci. 47 (2016) 1697–1712.

DOI: 10.1007/s11663-016-0626-9

[9] H.K. Yang, V. Doquet, Z.F. Zhang, Fatigue crack growth in two TWIP steels with different stacking fault energies, Int. J. Fatigue. 98 (2017) 247–258.

DOI: 10.1016/j.ijfatigue.2017.01.034

[10] K. Dai, Z. Wang, J. He, J. Ye, W. Liu, W. Cai, X. Liu, L. Zhong, Nonmetallic inclusion characterizations and effects on impact toughness anisotropy of TWIP steel with different Ce additions, Mater. Today Commun. 35 (2023) 106270.

DOI: 10.1016/j.mtcomm.2023.106270

[11] F. Vercruysse, F.M. Castro Cerda, P. Verleysen, R.H. Petrov, Behavior of ultrafast annealed advanced high strength steels under static and dynamic conditions, Mater. Sci. Eng. A. 780 (2020) 139168.

DOI: 10.1016/j.msea.2020.139168

[12] V. Mattos Ferreira, M.G. Mecozzi, R.H. Petrov, J. Sietsma, Microstructure development of pearlitic railway steels subjected to fast heating, Mater. Des. 221 (2022) 110989.

DOI: 10.1016/j.matdes.2022.110989

[13] H. Liu, J. Liu, S.K. Michelic, S. Shen, X. Su, B. Wu, H. Ding, Characterization and Analysis of Non-Metallic Inclusions in Low-Carbon Fe–Mn–Si–Al TWIP Steels, Steel Res. Int. 87 (2016) 1723–1732.

DOI: 10.1002/srin.201600131

[14] M.R. Aboutalebi, M. Isac, R.I.L. Guthrie, The behaviour of selenium impurities during the addition of se-containing manganese to steel melt, Steel Res. Int. 75 (2004) 366–372.

DOI: 10.1002/srin.200405782