HIGH-STRENGTH AND CORROSION-RESISTANT NICKEL-BASED POLYCRYSTALLINE HIGH-TEMPERATURE ALLOY AND PREPARATION METHOD THEREFOR

摘要

A high-strength and corrosion-resistant nickel-based polycrystalline high-temperature alloy and a preparation method therefor. The high-temperature alloy comprises (in mass percentages): 13-17% of Cr, 15-20% of Co, 0.1-0.5% of Ti, 5.0-5.5% of Al, 3.0-7.0% of W, Si: ≤0.5%, Mn: ≤0.5%, 1.5-2.0% of Nb, and 0.04-0.07% of C, with the balance being Ni. The process involves smelting, then a homogenization treatment, hot rolling, and finally a heat treatment. The alloy of the present invention has both excellent strength and corrosion resistance, and the tensile yield strengths thereof at room temperature and 850°C are respectively greater than 900 MPa and 680 MPa. In addition, same also has excellent processing properties and structural stability.