Speaker
Description
Titanium/steel bimetallic composite tubes combine the excellent corrosion resistance of titanium with the high strength and low cost of carbon steel, and therefore have considerable application potential in demanding service environments such as petrochemical engineering, marine engineering, and shipbuilding. Owing to its high forming efficiency, simplified processing route, and high dimensional accuracy, three-roll skew rolling is an effective method for fabricating seamless composite tubes with large length-to-diameter ratios. In this study, a dynamic three-dimensional finite element model was developed in Abaqus to simulate the three-roll skew rolling process of such composite tubes. The motion trajectory, metal flow behavior, distributions of stress, strain, and temperature fields, and evolution of interfacial bonding during skew rolling were systematically investigated. In addition, titanium/steel bimetallic composite tubes with uniform wall thickness and high-strength metallurgical bonding at the interface were successfully fabricated through rolling experiments, and their interfacial shear strength reached 260 MPa. The results show that the composite tube undergoes a typical helical forward motion driven by the three circumferentially arranged rolls. As a result of coupled circumferential and axial metal flow, the tube cross-section exhibits a periodic “round–triangular–round” geometric evolution. The numerical simulation further reveals the spatiotemporal distribution characteristics of stress, strain, and temperature during deformation, and elucidates the dynamic mechanism of interfacial bonding under thermomechanical coupling. The experimental results confirm the reliability of the finite element model and demonstrate that three-roll skew rolling can effectively produce high-quality titanium/steel bimetallic composite tubes. This study provides a theoretical basis and technical guidance for optimizing skew rolling process parameters and improving the bonding quality of bimetallic interfaces.
| Speaker Company/University | Taiyuan University of Technology |
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