| 摘要 |
PROBLEM TO BE SOLVED: To provide a turbine rotor capable of executing ultrasonic flaw detection of a stress concentration area of an axial groove for mounting a rotor vane to a disc, with high reliability.SOLUTION: In a turbine rotor, an axial groove is formed on a disc 2 mounted on a turbine shaft 1 as a rotor vane burying portion, and a relationship of &thetas;=tan((z1-zs)/(y0))≥35° is satisfied when a length in the turbine axial direction, of the axial groove is y0, a length in the disc radial direction free from a taper 8, of the axial groove is z1, a distance from an outer periphery in the disc radial direction, of a stress concentration area (dotted part) of the axial groove portion is zs, and an incident angle of ultrasonic wave used in ultrasonic flaw detection, is &thetas;. |
