Non-destructive techniques for determining the material characteristics of Cr-Mo-V rotor steel

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:82744

Goto, Toru; Kadoya, Yoshikuni; Konishi, Takashi; Kamimura, Takeo; Suyama, Shouji ^[1]; Haruki, Nirou; Ikuno, Takeshi; Yoshimura, Kouji ^[2]

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1. Mitsubishi Heavy Industries, Ltd., Hyogo (Japan). Takasago Research and Development Center
2. Kansai Electric Power Co., Inc., Hyogo (Japan)

Long-term service causes material deterioration, such as the accumulation of creep and fatigue damage, as well as softening and embrittlement, in the high-temperature components of fossil fuel power plants. Therefore, in order to extend plant life at minimum cost without any accidental outages, it is important to observe the material state, especially of rotors and conduct necessary repairs or replace them at the most appropriate time. Therefore, there is a need for non-destructive techniques to evaluate the material characteristics of Cr-Mo-V rotors under service. In this paper, a comparative report of non-destructive techniques using artificially aged and crept Cr-Mo-V steel specimens is given. The techniques tested include replication, hardness measurement, electro-magnetic and ultrasonic techniques, and conventional metallurgical techniques, which have been here to fore usable only in the laboratory, but due to expected advances in the non-destructive sampling of material from service rotors these techniques are now usable in the field. As a result of the studies, the features of each technique are well recognized and the suggestions for the further development of NDE methods for the evaluation of creep damage in Cr-Mo-V rotors are presented.

• OSTI ID: 82744
• Report Number(s): CONF-941007--; ISBN 0-7918-1382-7
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
CHROMIUM ALLOYS
MOLYBDENUM ALLOYS
NONDESTRUCTIVE TESTING
ROTORS
STEAM TURBINES
VANADIUM BASE ALLOYS