New development of spray forming technology - spray rolling
2023-01-02 01:05:58
Jet-rolling technology is a thin strip continuous casting technique that combines injection molding with twin-roll casting. It uses a high-pressure gas to atomize the molten metal into droplets, and then directs the high-speed fly to the gap of the roll to thermally deform the semi-solid material into a densely solidified dense strip. Compared to traditional twin-roll strip casting technology, this new technology offers higher cooling rates and productivity, as well as more alloys.
The main difference between the jet rolling technology and the twin-roll strip casting is: (1) In the twin-roll strip casting, the removal of the latent heat of the metal mainly depends on the heat conduction of the water-cooled roll, while in the spray-rolling, the atomized droplets The convective heat transfer, coupled with the heat transfer from the roll surface, greatly increases heat transfer and production efficiency, thereby reducing alloy segregation and casting defects. (2) In twin-roll strip casting, liquid metal is in contact with the roll surface and semi-solid metal in spray rolling. The solid particles uniformly distributed in the semi-solid material will become the heat sink of the nucleation site and the remaining liquid.
The study of 2124Al alloy (component: 4.4% Cu-1.5% Mg-0.6% Mn - residual Al) shows that, if optimized process parameters are used, the tensile strength, yield strength and fracture extension of the material obtained by spray rolling The long-term rate increased by 39%, 46% and 100% respectively. Microscopic studies have shown that microsegregation is reduced and the distribution of the constituent phases is relatively uniform. The results also show that proper control of the solid fraction in the semi-solid entering the nip can effectively improve the tensile properties of the material obtained.
Another advantage of spray rolling is the reduced anisotropy of the mechanical properties of the material obtained. The longitudinal and transverse mechanical properties of the spray-rolled material are very close, while the performance of conventional process materials is very sensitive to the rolling direction.
At present, there is no report on the research work of jet rolling process in the true sense. However, work has shown that the combination of spray forming and subsequent rolling can effectively improve the performance of the obtained material and further exploit the advantages of spray forming. For example, a steel/Al-Pb composite bearing strip with high interfacial bonding strength and good wear resistance is prepared by a spray+rolling process; Fe with high magnetic induction and low iron loss is prepared by spray forming and rolling process. -4.5% Si high silicon steel sheet; using injection molding and subsequent controlled rolling to produce ultra high carbon steel with ultra high strength and high plasticity, and so on. It is conceivable that the new process of combining injection molding directly with continuous casting and rolling will certainly bring us many new advanced materials that have never been seen before.
The main difference between the jet rolling technology and the twin-roll strip casting is: (1) In the twin-roll strip casting, the removal of the latent heat of the metal mainly depends on the heat conduction of the water-cooled roll, while in the spray-rolling, the atomized droplets The convective heat transfer, coupled with the heat transfer from the roll surface, greatly increases heat transfer and production efficiency, thereby reducing alloy segregation and casting defects. (2) In twin-roll strip casting, liquid metal is in contact with the roll surface and semi-solid metal in spray rolling. The solid particles uniformly distributed in the semi-solid material will become the heat sink of the nucleation site and the remaining liquid.
The study of 2124Al alloy (component: 4.4% Cu-1.5% Mg-0.6% Mn - residual Al) shows that, if optimized process parameters are used, the tensile strength, yield strength and fracture extension of the material obtained by spray rolling The long-term rate increased by 39%, 46% and 100% respectively. Microscopic studies have shown that microsegregation is reduced and the distribution of the constituent phases is relatively uniform. The results also show that proper control of the solid fraction in the semi-solid entering the nip can effectively improve the tensile properties of the material obtained.
Another advantage of spray rolling is the reduced anisotropy of the mechanical properties of the material obtained. The longitudinal and transverse mechanical properties of the spray-rolled material are very close, while the performance of conventional process materials is very sensitive to the rolling direction.
At present, there is no report on the research work of jet rolling process in the true sense. However, work has shown that the combination of spray forming and subsequent rolling can effectively improve the performance of the obtained material and further exploit the advantages of spray forming. For example, a steel/Al-Pb composite bearing strip with high interfacial bonding strength and good wear resistance is prepared by a spray+rolling process; Fe with high magnetic induction and low iron loss is prepared by spray forming and rolling process. -4.5% Si high silicon steel sheet; using injection molding and subsequent controlled rolling to produce ultra high carbon steel with ultra high strength and high plasticity, and so on. It is conceivable that the new process of combining injection molding directly with continuous casting and rolling will certainly bring us many new advanced materials that have never been seen before.
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