Publication Date:
2017-09-19
Description:
In this paper, a turbine blade made of K417 nickel-based superalloy after service for 600 hours was investigated, the microstructural features were identified through metallographic observation, the size of γ′ precipitates was adopted to quantitatively characterize the coarsening behavior, decomposition of primary carbides was also analyzed. In addition, micro-hardness tests were conducted on the turbine blade. The results indicated that size of γ′ precipitates in the tip region of the blade had a small increase, the decomposition of primary carbides did not occur. Meanwhile, the little reduction in micro-hardness in the tip section was found, which was caused by the coarsening of γ′ precipitates. To sum up, the service induced damage of the turbine blade after service for 600 hours was slight, the degeneration in the tip region was relatively obvious due to high temperature, the result is of great significance to evaluating the service safety of service exposed turbine blades.
Print ISSN:
1757-8981
Electronic ISSN:
1757-899X
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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