Liquid impact erosion mechanism and theoretical impact stress analysis in TiN-coated steam turbine blade materials

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Coating of TiN film was done by reactive magnetron sputter ion plating to improve the liquid impact erosion resistance of steam turbine blade materials, 12Cr steel and Stellite 6B, for nuclear power plant application. TiN-coated blade materials were initially deformed with depressions due to plastic deformation of the ductile substrate. The increase in the curvature in the depressions induced stress concentration with increasing number of impacts, followed by circumferential fracture of the TiN coating due to the circular propagation of cracks. The liquid impact erosion resistance of the blade materials was greatly improved by TiN coating done with the optimum ion plating condition. Damage decreased with increasing TiN coating thickness. According to the theoretical analysis of stresses generated by liquid impact, TiN coating alleviated the impact stress of 12Cr steel and Stellite 6B due to stress attenuation and stress wave reactions such as reflection and transmission at the coating-substrate interface.
Publisher
MINERALS METALS MATERIALS SOC
Issue Date
1999-04
Language
English
Article Type
Article
Citation

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.30, no.4, pp.961 - 968

ISSN
1073-5623
URI
http://hdl.handle.net/10203/25247
Appears in Collection
MS-Journal Papers(저널논문)
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