Thermal fatigue test for turbine housing by a pulse YAG laser

Muneharu Kutsuna; Shinji Fujita; Yuji Sugita; Katsushige Yamada

doi:10.1117/12.377051

7 February 2000 Thermal fatigue test for turbine housing by a pulse YAG laser

Muneharu Kutsuna, Shinji Fujita, Yuji Sugita, Katsushige Yamada

Proceedings Volume 3888, High-Power Lasers in Manufacturing; (2000) https://doi.org/10.1117/12.377051
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

A steam turbine housing (casing) for power plant is subject to thermal fatigue in the long service. Evaluation of the life time is required for the replacement of turbine housing. In the present work, the possibility of thermal fatigue test by laser to accelerate the thermal damage of the materials (heat resisting Cr-Mo steel) and estimate the life time of casing in short time has been investigated using a pulse YAG laser. The test specimen are taken from the turbine housing which have been used for 100,000 hours in service. The pulse YAG laser of 100 pps was irradiated on the specimen with different beam spot sizes for one sec. and interrupted for 9 sec. as a thermal fatigue cycle. Max. cycle in this laser thermal fatigue tests was 5400 cycles. The peak temperature of theram cycle was about 220 degrees Celsius after 5400 cycles in this laser thermal fatigue test. The fatigue crack was observed at the root of circular groove after 5400 cycles.

Citation Download Citation

Muneharu Kutsuna, Shinji Fujita, Yuji Sugita, and Katsushige Yamada "Thermal fatigue test for turbine housing by a pulse YAG laser", Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); https://doi.org/10.1117/12.377051

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