Abstract: In order to obtain Al/steel bimetal composite materials with good metallurgical combination, the process of Al/steel compound casting is proposed. The solid heat-resisting steel plate is dipped into liquid aluminum for 15min and then put it into the casting mould and pour the fresh liquid ZL102 of 760℃ around it. After coasting, the sample is carried out to heat preservation treatment. During hot-dipping in an Al alloy bath, a 32μm thick diffusion was formed between the steel plate and the aluminum coating. During the composite casting process, complex interface reactions were observed for the Al_4.5FeSi phases formation in the interfacial bonding zone. Analysis found, heat preservation of the sample can promote the formation of the intermetallic compounds in the diffusion layer and the growth of the diffusion layer. After heat preservation treatment 30min, the diffusion layer can achieve 300μm, meanwhile the microhardness is over 650HV. The results show that a metallurgical combination is achieved between ZL102 and high-temperature steel via this casting process, which contributes to the foundation of producing Al/steel bimetal composite materials.
 
Keywords: Compound casting, hot-dipping, metallurgical combination, intermetallic compounds.

Cite: Qiang Wang, Cheng-Zhi Zhao, He-Xin Zhang, Hong Li, Xue-Kai Yang, "Microstructure and Mechanical Properties of Al/Steel Bimetal Composite Produced by Compound Casting," International Journal of Materials Science and Engineering, Vol. 6, No. 3, pp. 72-79, September 2018. doi: 10.17706/ijmse.2018.6.3.72-79