2019 年 68 巻 4 号 p. 346-350
To improve reliability and manufacture yield of gas turbine blade for thermal power plant, the method of measuring crystal orientation of Ni-base superalloy turbine blade by non-destruction using laboratory X-ray was developed. Crystal orientation measurement function was added to existing X-ray residual stress measurement equipment, which is diffraction method measuring crystal orientation defined from diffraction data of particular lattice plane by characteristic X-ray. The measurement accuracy of this equipment is very high equal to Laue method or EBSD which are general technique, and a surface smooth finishing process is not necessary. Furthermore, calculation method of inclination angle of crystal growth direction from blade height direction was established in measurement from the side face of blade with this equipment. Crystal orientation of mass-produced turbine blade became able to be measured experimentally and effectively by this technique.