Effect of rheo-diecast process on the mechanical properties of A390 alloy by serpentine channel

Kunhyok Ri^1,2，Wei-min Mao¹，Zhi-kai Zheng¹，Myongsik Kim²，Yongho Sin²

1. School of Materials Science and Engineering, University of Science and Technology Beijing2. School of Material Engineering, Pyongyang Machinery University

摘 要：In this paper, the effects of rheo-diecast process parameters and T6 heat treatment on the microstructure and mechanical properties of the rheo-diecasting（RDC） semi-solid A390 alloy prepared through pure copper serpentine channel were investigated. The results indicate that the mechanical properties of the RDC samples change with the pouring temperature and injection pressure. In this case, a lower pouring temperature results in better tensile strength and elongation of the RDC A390 alloy; however, the tensile strength and elongation decrease when the pouring temperature decreases to 660°C. Higher injection pressures result in the improved mechanical properties of the RDC A390 alloy. To some extent, T6 heat treatment improves the tensile strength and ductility of the RDC A390 alloy compared to those of the non-heat treated alloy. However, when the pouring temperature and injection pressure are greater than 670°C and 70 MPa, respectively, the mechanical properties are sharply diminished.

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