Ni-based alloy, ni-based alloy for gas turbine combustor, member for gas turbine combustor, liner member, transition piece member, liner, and transition piece

Abstract

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=Ain relation to an area A of a nitride with a largest size among nitrides present in a measurement field of view area Sof 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, D, . . . Dto calculate a standardized variable y, plotting the area-equivalent diameter D and the standardized variable yon X and Y axes of an X-Y coordinate system, respectively, to obtain a regression line y=a×D+b (wherein a and b are constants) to calculating ywhere a cross-sectional area to be predicted S is 100 mm, and substituting the obtained value of yinto the regression line to obtain the estimated largest size of the nitrides.