Abstract
In this paper, we focus on the bonding mechanism of bimetallic clad tube because of its low cost and comprehensive properties. The numerical simulation and the experiment are carried out from the diffusion behavior of carbon atoms in the metallurgical bonding process. Based on the dislocation density model of Kocks, the tube billets are rolled by pilger hot rolling; the outer tube is 06Cr19Ni10 stainless steel, the inner tube is Q235 carbon steel, and the wall thickness ratio is 1 : 1. The research shows that the diffusion ability of carbon atoms mainly depends on the degree of the plastic strain in the stainless steel hot rolling process; there is positive correlation between the thickness of bonding carburized layer and the dislocation density produced by plastic deformation of stainless steel. The thickness difference of circumferential carburized layer in the deformation zone is larger than that near the finishing zone. Furthermore, a lot of contaminants cannot be completely metallurgically bonded between 20% and 30% reduction ratios; the contaminants near the bonding layer are refined and completely bonded metallurgically between 30% and 60% reduction ratios; the contaminants are further refined above 60% to 70% reduction ratio.
Highlights
E technology of the bimetallic clad tube mainly includes mechanical bonding and metallurgical bonding process. e metallurgical bonding process has a higher bonding strength than the mechanical bonding process
Bonding Mechanism of Hot Rolling Carbon Steel/Stainless Steel. e difference between the mechanical bonding carbon steel/stainless steel and the hot rolling metallurgical bonding is whether the atomic diffusion takes place in the bonding layer
Carbon atoms in carbon steel acquire higher atomic activation energy at high temperature and begin to diffuse into a large number of new grain boundaries caused by dislocations in stainless steel [11,12,13]. e carburized layer, the decarburized layer, and the interface appear [14], as shown in Figures 1(c) and 1(d)
Summary
Due to the limitation of the finite element calculation and the complexity of the pilger hot rolling clad tube process, the model must be simplified [20]. E outer and the inner tube billets of the. En, the outer and inner tubes were packaged together by welding at both ends. En, the microstructure of stainless steel clad tube was observed by using SEM The inner metal and the outer metal were etched, respectively. e carbon steel was etched with 4% ethanol solution of nitric acid while the stainless steel was etched with 10% chromic acid electrolytic method for microstructure observation. en, the microstructure of stainless steel clad tube was observed by using SEM
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