Microstructure and Interfacial Bonding Property of a Hot-roll-bonded TWIP/IF Steel Composite Plate

doi:10.3901/JME.2024.04.345

Abstract

Abstract: The reliability of interfacial bonding has a significant impact on the mechanical properties of a laminated composite plate.A three-layered composite plate with the surface layers of twinning-induced plasticity(TWIP) steel and the central layer of interstitial free(IF) steel is fabricated by hot-roll-bonding and annealing processes. Through tensile-shear tests, microhardness measurements,quantitative analysis of alloying elements distributing around the bonding interface, and microstructure characterization before and after deformation, the formation of the bonding interface, the reliability of the interfacial bonding, and the inter-layer shear deformation behavior of the composite plate are investigated. The results are as follows. The bonding interface of the composite plate is essentially a thin-layered region with an average width of approximately 12 μm, which mainly contains lamellar martensite structure and has significantly higher hardness than the neighboring TWIP and IF steels. Around the thin interfacial layer, the main alloying elements C and Mn undergo redistribution. A mechanism is then proposed for the formation of the thin interfacial bonding region, based on the above characterizations and analyses. The inter-layer shear strength of the composite plate is higher than the shear strength of the IF steel, and the failure of the tensile-shear specimen takes place in the IF steel matrix, indicating that the interfacial bonding region develops a robust metallurgical bond with both the IF steel and the TWIP steel. During the tensile-shear deformation, the good plasticity of the IF steel contributes to inhibiting the initiation and propagation of parallel microcracks on both sides of the interfacial bonding region and perpendicular microcracks within the interfacial bonding region.

Key words: multi-layered composite plate, microstructure, interfacial bonding property, shear deformation and fracture behavior

CLC Number:

TG142

MA Yixing, YANG Yutao, GUAN Xiaohu, YANG Qi, ZHAO Tongxin. Microstructure and Interfacial Bonding Property of a Hot-roll-bonded TWIP/IF Steel Composite Plate[J]. Journal of Mechanical Engineering, 2024, 60(4): 345-356.

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