Liquid impact erosion mechanism and theoretical impact stress analysis in TiN-coated steam turbine blade materials
Creators
- 1. Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering
Description
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
Additional details
Publishing Information
- Journal Title
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
- Journal Volume
- 30
- Journal Issue
- 4
- Journal Page Range
- p. 961-968
- ISSN
- 1073-5623
- CODEN
- MMTAEB
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 30038601
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Descriptors DEI
- EROSION; LIQUIDS; NUCLEAR POWER PLANTS; PROTECTIVE COATINGS; STEEL-CR12; STELLITE 6; STRESSES; THICKNESS; TITANIUM NITRIDES; TURBINE BLADES
- Descriptors DEC
- ALLOY-CO60CR30W4; ALLOYS; CARBON ADDITIONS; CHROMIUM ALLOYS; CHROMIUM STEELS; COATINGS; COBALT ALLOYS; COBALT BASE ALLOYS; CORROSION RESISTANT ALLOYS; DIMENSIONS; FLUIDS; HAYNES ALLOYS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; MARTENSITIC STEELS; MATERIALS; NICKEL ALLOYS; NITRIDES; NITROGEN COMPOUNDS; NUCLEAR FACILITIES; PNICTIDES; POWER PLANTS; STAINLESS STEELS; STEELS; STELLITE; THERMAL POWER PLANTS; TITANIUM COMPOUNDS; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS; TUNGSTEN ALLOYS