Defects and Fracture Strength of Large Rotor Forgings for Steam Turbines

[+] Author and Article Information
K. Kumeno

Fundamental Engineering, Technology Center, Hitachi Ltd., Chiyoda-Ku, Tokyo, Japan

M. Nishimura, K. Mitsuda

Steam Turbine Engineering Section, Hitachi Works of Hitachi Ltd., Salwal-Cho, Hitachi-Shi, Ibaraki-Ken, Japan

T. Iwasaki

3–4 Room, Hitachi Research Laboratory of Hitachi Ltd., Salwal-Cho, Hitachi-Shi, Ibaraki-Ken, Japan

J. Eng. Power 99(1), 134-142 (Jan 01, 1977) (9 pages) doi:10.1115/1.3446242 History: Received June 23, 1975; Online July 14, 2010


Engineering criterion for brittle fracture of turbine rotors has been established based on the fracture mechanics and test results of fracture toughness and crack growth rate. From two typical large rotor forgings which contain defects in the region of center bore, the reliable K IC data and crack growth rate data were obtained by various types of test specimens. The strength evaluation method of the rotor in the presence of defects has been completed as a form of allowable flaw size diagrams considering the loading conditions in service life of steam turbines.

Copyright © 1977 by ASME
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