Research on bonding mechanism of bimetallic composite shaft by cross-wedge rolling

作者：Junling Li, Ao Wang, Jialong Lü, Zhigang Li, Ping Chen, Chaoyang Sun, Like Pan, Lijian Xuan, Lu Zhang · 发表于：Journal of Materials Research and Technology · 年份：2025 · DOI：10.1016/j.jmrt.2025.05.080 · 被引用次数：6 · 研究领域：Metal Forming Simulation Techniques、Metallurgy and Material Forming、Advanced Welding Techniques Analysis

In order to meet the demand of high-performance shaft parts for Marine engineering equipment under high salt and high-pressure environment, in this paper, the cross-wedge rolling (CWR) method is used to prepare 34CrMo1/316L bimetallic composite shaft. Based on the thermal compression test, the harmonious deformation law of the two materials was investigated. The forming of composite shaft is studied by means of wedge rolling experiment and finite element analysis. The interface properties of composite axes were characterized by shear tests. The microcosmic analysis of the interface region is carried out. The results show that: Deformation temperature, deformation amount and deformation rate significantly affect the deformation coordination of the two materials. The composite shaft is well formed in the process of forming temperature of 1000∼1200°C, area reduction of 50∼60%, coating thickness of 2∼3mm and rolling speed of 15∼20rpm. The shear strength of the composite shafts with good macro forming reaches more than 70% of the substrate. Element diffusion occurs at the bonding interface, and elements diffuse downward from the high concentration region to the low concentration region. A clear bonding layer is formed between the two materials. Most of the grain boundaries on the side of the cladding material (CM) are high angle grain boundaries (LAGBs), while most of the grain boundaries on the side of the substrate material (SM) are low angle grain boundaries (LAGBs). The grains...