METHOD TO DETERMINE SHIFT OF CRITICAL BRITTLENESS TEMPERATURE OF STEELS FOR FORECASTING EMBRITTLEMENT OF BODIES OF REACTORS OF PWR TYPE Russian patent published in 2017 - IPC G21C17/00 G01N3/18 

FIELD: metallurgy.

SUBSTANCE: method to determine shift of critical brittleness temperature of steels includes production of samples, determination of their hardness in initial state and after irradiation with fast neutrons, determination of temperature shift of brittle-viscous transition, at that the samples of steel with alternating concentration of one of components according to one of sample parameters, their macrohardness at the points with the same concentration of the variable component is determined by the Brinell hardeness test, and shift of temperature of brittle-viscous transition ΔTc is determined for each point by the formula: ΔTc=A+B(ΔHB)²_,where ΔNV=NV_on-NV_i, NV_OB - hardness steel after exposure, MP_A, NV_i - hardness steel the initial state, MP_A, A=100°C, B=0.00012°C/(Mpa)².

EFFECT: invention makes it possible to reduce labour coefficient and time to determine shift of critical brittleness temperature when developing steels for bodies of reactors of type PWR type.

6 cl