A METHOD OF HEAT TREATMENT FOR DESENSITIZING A NICKEL-BASED ALLOY RELATIVE TO ENVIRONMENTALLY-ASSISTED CRACKING, IN PARTICULAR FOR A NUCLEAR REACTOR FUEL ASSEMBLY AND FOR A NUCLEAR REACTOR, AND A PART MADE OF SAID ALLOY AND SUBJECTED TO SAID TREATMENT

摘要

Process for heat treatment for crack desensitizing assisted by a nickel (Ni)-based alloy environment of composition comprising (in wt.%) e.g. carbon (C) (= 0.10), manganese (Mn) (= 0.5), silicon (Si) (= 0.5), phosphorus (P) (= 0.015), sulfur (S) (= 0.015), Ni (= 40), chromium (Cr) (12-40), cobalt (Co) (= 10), aluminum (Al) (= 5), molybdenum (Mo) (0.1-15), titanium (Ti) (= 5), boron (B) (= 0.01), copper (Cu) (= 5), and tungsten (W) (0.1-15 ), comprises maintaining the alloy at 950-1160[deg] C in an atmosphere containing 100 ppm of hydrogen mixed with neutral gas or in pure hydrogen. Process for heat treatment for crack desensitizing assisted by a nickel (Ni)-based alloy environment of composition comprising (in wt.%), carbon (C) (= 0.10), manganese (Mn) (= 0.5), silicon (Si) (= 0.5), phosphorus (P) (= 0.015), sulfur (S) (= 0.015), Ni (= 40), chromium (Cr) (12-40), cobalt (Co) (= 10), aluminum (Al) (= 5), molybdenum (Mo) (0.1-15), titanium (Ti) (= 5), boron (B) (= 0.01), copper (Cu) (= 5), tungsten (W) (0.1-15 ), niobium (Nb) (0-10), tantalum (Ta) (= 10), and the remainder of iron (Fe), and unavoidable impurities obtained by elaboration, comprises maintaining the alloy at 950-1160[deg] C in an atmosphere containing 100 ppm of hydrogen mixed with neutral gas or in pure hydrogen. Independent claims are included for: (1) a manufacturing process of a piece of Ni-based alloy composition, comprising the heat treatment of crack desensitization assisted by the alloy environment; and (2) a part made of a Ni-based alloy, where the alloy is subjected to the heat treatment of desensitization.