H2气氛用耐热合金的成分设计与力学性能研究

Ni-Cr-Al and Ni-Cr-W foundry alloys are widely used in the high temperature and corrosive conditions due to their excellent high-temperature resistant, corrosion resistance and high temperature mechanical properties. In this paper, the influence of the change of Cr, W, Al, C and other elements on the melting point of the alloy was studied by thermodynamic calculation software Thermo-Calc. And, two experimental alloys for furnace tubes used in H2 atmosphere were designed. The room temperature tensile strength of 2# experimental alloy is 520MPa, the room temperature tensile strength of 3# experimental alloy is 517MPa; the high temperature (1100℃) tensile strength of 2# experimental alloy is 93.0MPa; the high temperature of 3# experimental alloy (1100℃) ) The tensile strength is 82.0MPa; the permanent fracture time of the 2# and 3# experimental alloys is greater than 100h at 1100℃ and the test stress is 17MPa. Compared with the ZG50Ni45Cr35NbM alloy, the experimental alloy has greatly improved mechanical properties at room temperature and high temperature, and has the potential to be used in H2 atmosphere.