Análisis experimental y simulación numérica de unión por laminación de planchas de acero Q235

Guanghui Zhao; Qingxue Huang; Cunlong Zhou; Zhanjie Zhang; Lifeng Ma; Xiaogang Wang

doi:10.3989/revmetalm.069

Authors

Guanghui Zhao University of Science and Technology, Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology
Qingxue Huang University of Science and Technology, Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology
Cunlong Zhou University of Science and Technology, Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology
Zhanjie Zhang University of Science and Technology, Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology
Lifeng Ma University of Science and Technology, Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology
Xiaogang Wang University of Science and Technology, Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology

DOI:

https://doi.org/10.3989/revmetalm.069

Keywords:

Heavy-gauge steel plate, MARC simulation, Roll bonding

Abstract

Heavy-gauge Q235 steel plate was roll bonded, and the process was simulated using MARC software. Ultrasonic testing results revealed the presence of cracks and lamination defects in an 80-mm clad steel sheet, especially at the head and tail of the steel plate. There were non-uniform ferrite + pearlite microstructures and unbound areas at a bond interface. Through scanning electron microscopy analysis, long cracks and additional inclusions in the cracks were observed at the interface. A fracture analysis revealed non-uniform inclusions that pervaded the interface. Moreover, MARC simulations demonstrated that there was little equivalent strain at the centre of the slab during the first rolling pass. The equivalent centre increased to 0.5 by the fourth rolling pass. Prior to the final pass, the equivalent strain was not consistent across the thickness direction, preventing bonding interfaces from forming consistent deformation and decreasing the residual stress. The initial rolling reduction rate should not be very small (e.g. 5%) as it is averse to the coordination of rolling deformation. Such rolling processes are averse to the rolling bond.

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