High-aluminum austenite Incoloy 800H alloy and preparation method thereof

The invention discloses a high-aluminum austenite Incoloy 800H alloy and a preparation method thereof, and the high-aluminum austenite Incoloy 800H alloy comprises the following components in percentage by mass: 3-7% of Al, 2-24% of Cr, 32% of Ni, 0.4% of Ti, 0.08% of C and the balance of Fe. The method comprises the following steps: (1) weighing reaction materials according to a preset proportion to prepare an initial mixture; (2) uniformly mixing the initial mixture in a ball mill, and then pressing into a cake-shaped blank on a press machine; (3) the cake-shaped blank is put into a reaction kettle, an ignition agent is placed on a blank body, protective gas is inflated for gas washing, then protective gas is inflated for pressure maintaining, the temperature continues to rise till a self-propagating reaction occurs in a system, and an initial casting blank is obtained; (4) the initial casting blank is subjected to vacuum induction secondary smelting, and a high-aluminum Incoloy 800H casting blank is obtain