Morfologi dan Karakteristik Lapisan Intermetalik Akibat Die Soldering pada Permukaan Baja Cetakan (Dies) dalam Proses Pengecoran Tekan Paduan Aluminium Silikon

The major mode which lead to die failure in die casting is die soldering caused by the intimate contact between alloy and die at high temperature. It leads to malfunctioning of die inserts that require replacement or repair, thus causing significant decrease in productivity. The effect of melt temperatures on morphology and characteristic of intermetallic layer such as thickness and hardness of intermetallic layer between die surface and aluminum has been studied. This experiment used as-annealed H13 tool steel as die material which dipped into Al-7%Si alloy at 6800C, 7000C, 7200C and Al-11%Si alloy at 6600C, 6800C, 7000C. High melt temperature favored the growth of intermetallic layer due tp the increasie of the diffusion rate of iron and aluminum atoms. Hence, high melt temperature facilitates die soldering.