NI-BASED ALLOY, NI-BASED ALLOY FOR GAS TURBINE COMBUSTOR, MEMBER FOR GAS TURBINE COMBUSTOR, MEMBER FOR LINER, MEMBER FOR TRANSMISSION PIECE, LINER, AND TRANSMISSION PIECE

摘要

A Ni-based alloy comprises nitrides, of which an estimated largest size is an area-equivalent diameter of 12 µm to 25 µm, the estimated largest size of the nitrides being determined by calculating an area-equivalent diameter D which is defined as D = A 1/2 in relation to an area A of a nitride with a largest size among nitrides present in a measurement field of view area So of an observation of the Ni-based alloy, repeatedly performing this operation for n times corresponding to a measurement field of view number n to acquire n pieces of data of the area-equivalent diameter D, arranging the pieces of data of area-equivalent diameter D in ascending order into D 1 , D 2 , ... D n to calculate a standardized variable y j , plotting the area-equivalent diameter D and the standardized variable y j on X and Y axes of an X-Y coordinate system, respectively, to obtain a regression line y j = a × D + b (wherein a and b are constants) to calculating y j where a cross-sectional area to be predicted S is 100 mm 2 , and substituting the obtained value of y j into the regression line to obtain the estimated largest size of the nitrides.