Cerium-containing austenitic nickel-base alloy having enhanced intergranular attack and stress corrosion cracking resistances, and preparation method thereof

摘要

The present invention relates to a cerium-containing austenitic nickel-base alloy having enhanced IGA(intergranular attack) and SCC(stress corrosion cracking) resistances, and a preparation method thereof. The cerium-containing alloy according to the present invention is prepared by adding cerium to an austenitic nickel-base alloy, which is used as a material of heat tubes of a steam generator in a nuclear power plant. The cerium-containing alloy has a refiner grain size than the conventional alloy without cerium, a semi-continuous distribution of intergranular carbides, and improved intergranular attack and stress corrosion cracking resistances in the environment of high temperature and base.