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

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=A1/2 in relation to an area A of a nitride with a largest size among nitrides present in a measurement field of view area S0 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 D1, D2, . . . Dn to calculate a standardized variable yj, plotting the area-equivalent diameter D and the standardized variable yj on X and Y axes of an X-Y coordinate system, respectively, to obtain a regression line yj=a×D+b (wherein a and b are constants) to calculating yj where a cross-sectional area to be predicted S is 100 mm2, and substituting the obtained value of yj into the regression line to obtain the estimated largest size of the nitrides.