PRECIPITATION-STRENGTHENED NI-BASED HEAT-RESISTANT ALLOY AND METHOD FOR PRODUCING THE SAME

摘要

A precipitation-strengthened Ni-based heat-resistant alloy of the present invention includes 0.03 wt% or less of C, 0.5 wt% or less of Mn, 0.01 wt% or less of P, 0.01 wt% or less of S, 2.0 to 3.0 wt% of Si, 23 to 30 wt% of Cr, 7.0 to 14.0 wt% of W, 10 to 20 wt% of Fe, and 40 to 60 wt% of Ni, wherein a total content of C, N, O, P and S is 0.01 wt% or less. A silicide is dispersed and precipitated and a grain size of a matrix austenite is controlled through a thermo-mechanical treatment. As a result, the precipitation-strengthened Ni-based heat-resistant alloy excellent in irradiation resistance, heat resistance and corrosion resistance can be obtained with a low cost.