Hitachi Metals, Ltd.

Hitachi Metals Mmc Superalloy, Ltd.

Kenichi Yaguchi

Tadashi Fukuda

Takanori Matsui

Masato Itoh

Daisuke Yoshida

Ikuo Okada

Yoshitaka Uemura

Hidetaka Oguma

Masaki Taneike

Yoshiyuki Inoue

A Ni-based alloy comprises nitrides, of which an estimated largest size is an area-equivalent diameter of 12 &#x3bc;m to 25 &#x3bc;m, 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&#xd7;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.

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

In a Ni-base alloy, an area-equivalent diameter D is calculated. D is defined by D=Afrom an area A of a largest nitride in a field of view when an observation area Sis observed. This process is repeated in n fields of view for measurement, where n is the number of the fields of view for measurement, so as to acquire n pieces of data on D, and the pieces are arranged in ascending order D, D, . . . , Dto obtain a reduced variate y. The obtained values are plotted on X-Y axis coordinates, where an X axis corresponds to D and a Y axis corresponds to y. In a regression line y=a&#xd7;D+b, yis obtained when a target cross-sectional area S is set to 100 mm. When the obtained yis substituted into the regression line, the estimated nitride maximum size is &#x2266;25 &#x3bc;m in diameter.

Ni-base alloy

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Kitamoto, Japan

Kenichi Yaguchi