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10.3390/ma18040758
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Article

Deformation and Fracture Behaviour of Heterostructure Mn8/SS400 Bimetal Composite

by
Shengnan Yuan
1,
Cunlong Zhou
2,
Haibo Xie
1,
Mengyuan Ren
1,3,
Fei Lin
1,3,
Xiaojun Liang
4,
Xing Zhao
4,
Hongbin Li
4,
Sihai Jiao
4 and
Zhengyi Jiang
1,*
1
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
2
School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
3
Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China
4
Baosteel Research Institute (R&D Centre), Baoshan Iron & Steel Co., Ltd., Shanghai 200431, China
*
Author to whom correspondence should be addressed.
Materials 2025, 18(4), 758; https://doi.org/10.3390/ma18040758
Submission received: 30 December 2024 / Revised: 29 January 2025 / Accepted: 5 February 2025 / Published: 8 February 2025
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Abstract

This study examines the deformation behaviour and fracture mechanisms of bimetal composites (BCs) composed of high-carbon medium-manganese steel (Mn8) and low-carbon steel (SS400), fabricated through hot roll bonding. The research highlights the effect of varying thickness ratios on the mechanical properties of Mn8/SS400 BCs. The microstructure and interfacial characteristics were analysed using scanning electron microscopy (SEM), revealing a well-bonded and defect-free interface with distinct elemental distributions. Tensile and bending tests were conducted to evaluate the composites’ mechanical performance, highlighting the synergistic effects of Mn8’s high strain hardening capacity and SS400’s ductility. Mathematical models, including the rule of mixtures (ROM) and the long-wavelength approach (LWA), were employed to predict the tensile strength and plastic instability strain (PIS), with experimental results showing deviations due to interfacial strengthening mechanisms and dislocation pile-ups. The findings provide insights into the interplay between layer thickness ratios, interfacial properties, and strain hardening, offering valuable guidance for optimising the design and industrial-scale production of Mn8/SS400 BCs.
Keywords: bimetal composite; deformation; plastic instability strain; fracture mechanism bimetal composite; deformation; plastic instability strain; fracture mechanism

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MDPI and ACS Style

Yuan, S.; Zhou, C.; Xie, H.; Ren, M.; Lin, F.; Liang, X.; Zhao, X.; Li, H.; Jiao, S.; Jiang, Z. Deformation and Fracture Behaviour of Heterostructure Mn8/SS400 Bimetal Composite. Materials 2025, 18, 758. https://doi.org/10.3390/ma18040758

AMA Style

Yuan S, Zhou C, Xie H, Ren M, Lin F, Liang X, Zhao X, Li H, Jiao S, Jiang Z. Deformation and Fracture Behaviour of Heterostructure Mn8/SS400 Bimetal Composite. Materials. 2025; 18(4):758. https://doi.org/10.3390/ma18040758

Chicago/Turabian Style

Yuan, Shengnan, Cunlong Zhou, Haibo Xie, Mengyuan Ren, Fei Lin, Xiaojun Liang, Xing Zhao, Hongbin Li, Sihai Jiao, and Zhengyi Jiang. 2025. "Deformation and Fracture Behaviour of Heterostructure Mn8/SS400 Bimetal Composite" Materials 18, no. 4: 758. https://doi.org/10.3390/ma18040758

APA Style

Yuan, S., Zhou, C., Xie, H., Ren, M., Lin, F., Liang, X., Zhao, X., Li, H., Jiao, S., & Jiang, Z. (2025). Deformation and Fracture Behaviour of Heterostructure Mn8/SS400 Bimetal Composite. Materials, 18(4), 758. https://doi.org/10.3390/ma18040758

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