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steam turbine blade erosion

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Published: 30 August 2021
Fig. 16 Liquid droplet erosion from a low-pressure steam turbine blade that failed under fatigue loading. (a) Photograph of leading-edge airfoil, suction side. The lower portion of the airfoil (left) was 400-series stainless steel alloy; the upper portion of the airfoil (right) was clad More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006378
EISBN: 978-1-62708-192-4
... of the distinctions between the different forms of erosion. It discusses steam turbine blade erosion, aircraft rain erosion, and rain erosion of wind turbine blades. The article describes the mechanisms of liquid impact erosion and time dependence of erosion rate. It reviews critical empirical observations regarding...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006428
EISBN: 978-1-62708-192-4
... Summary of wear and friction related issues in steam turbines Steam turbine section Components involved Potential issues Remarks Main stop valve and other control valves 565 to 650 °C (1050 to 1200 °F) Valve stem Erosion of valve stem by iron particles generating from exfoliating boiler...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004155
EISBN: 978-1-62708-184-9
... , 36 , 37 ). In addition, there is water droplet erosion of last rows of LP turbine blades ( Ref 2 , 3 , 6 , 29 , 38 ) and solid-particle erosion in the high-pressure and intermediate-pressure turbines and turbine valves caused by exfoliation of oxides in superheaters, reheaters, and steam piping...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
.... Affected Systems and Materials Material degradation by liquid-droplet erosion is a significant problem in just a few kinds of engineering systems: blades in the low-pressure ends of steam turbines where the steam is “wet,” and aircraft, missiles, and helicopter rotors flying at high speeds through...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006824
EISBN: 978-1-62708-329-4
..., creating asperities. Continued droplet impacts generate fatigue loading on the asperities and can eventually lead to their fracture ( Ref 12 ). Water droplet erosion of steam turbine blades is most significant at the leading edge of the airfoil suction side, where the droplets impact at a high...
Image
Published: 01 January 2002
Fig. 9 Two portions of a modified type 403 stainless steel steam turbine blade damaged by liquid impingement erosion. The portion at left was protected by a shield of 1 mm (0.04 in.) thick rolled Stellite 6B brazed onto the leading edge of the blade; the portion at right was unprotected More
Image
Published: 15 January 2021
Fig. 9 Two portions of a modified type 403 stainless steel steam turbine blade damaged by liquid impingement erosion. The portion at left was protected by a 1 mm (0.04 in.) thick shield made of rolled Stellite 6B brazed onto the leading edge of the blade; the portion at right was unprotected More
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006796
EISBN: 978-1-62708-295-2
... of Predictive Equations and Evaluation of Material Performance , Zairyo-to-Kankyo (Corros. Eng.) , Vol 57 , 2008 , p 146 – 152 10.3323/jcorr.57.146 26. Ahmad M. , Casey M. , and Sürken N. , Experimental Assessment of Droplet Impact Erosion Resistance of Steam Turbine Blade Materials...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
... microjet within the pit. Among the components most susceptible to liquid impingement erosion are low-pressure turbine blades, low-temperature steam piping, and condenser or other heat-exchanger tubes that are subjected to direct impingement by wet steam. Liquid impingement erosion in tubing...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005738
EISBN: 978-1-62708-171-9
... ceramics ABRADABLE CLEARANCE-CONTROL COATINGS are successfully used today (2013) in aero-engine, industrial and steam turbine, and various other types of turbomachinery applications. In most types of turbines, it is necessary to leave clearances beyond the free ends of the blades and vanes to provide...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... damage, because shock waves bouncing off the sides of the pit cause the formation of a high-energy microjet within the pit. Among the components most susceptible to liquid impingement erosion are low-pressure turbine blades, low-temperature steam piping, and condenser and other heat-exchanger...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004133
EISBN: 978-1-62708-184-9
...) and ultrasupercritical (USC) power plants. These components include high-pressure steam piping and headers, superheater and reheater tubing, water wall tubing in the boiler, high-and intermediate-pressure rotors, rotating blades, and bolts in the turbine section. The article reviews the boiler alloys, used in SC and USC...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004158
EISBN: 978-1-62708-184-9
... of turbines used in intermediate- or base-load service to clean without interrupting operation. Care must be exercised with online washing because of the risk of water-droplet erosion to the compressor blades. Original equipment manufacturers (OEMs) may limit the frequency and duration of online water washing...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005734
EISBN: 978-1-62708-171-9
... are caused by mechanical shock emanating from the surface and propagating into the coating and/or the substrate. Liquid Droplet Erosion Liquid droplet erosion is caused by a shock wave that is induced by liquid droplet impact. This is a common occurrence for steam or water turbine blades or buckets...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004124
EISBN: 978-1-62708-184-9
.... The Rankine cycle consists of compression of liquid water by a boiler feed pump, heating to the saturation temperature in an economizer, evaporation in the furnace, expansion work in the steam turbine, and condensation of the exhaust steam in a condenser. Steam cycle efficiency can be improved by adding...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... Abstract This article focuses on the life assessment methods for elevated-temperature failure mechanisms and metallurgical instabilities that reduce life or cause loss of function or operating time of high-temperature components, namely, gas turbine blade, and power plant piping and tubing...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005708
EISBN: 978-1-62708-171-9
... substrates such as stainless steels. Susceptible components are impellors, turbine blades, and casings ( Ref 5 ). Figure 3 shows runner blades that experienced cavitation erosion failure. Fig. 3 Turbine runner blades showing cavitation erosive failure. Source: Ref 5 In most situations...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003521
EISBN: 978-1-62708-180-1
... in understanding what properties should be typical. It is also very useful to examine the failed component in undamaged areas. For example, turbine blade roots in steam turbines are not exposed to service environment steam and temperature as airfoils are. Comparison of properties between the root and airfoil can...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003631
EISBN: 978-1-62708-182-5
... involve a cavitation mechanism. Two areas are most notable for water drop impingement: steam turbines and helicopter rotor blades. In turbines, condensation of steam produces droplets that are carried into the rotor blades, with consequent surface damage. Raindrop erosion on helicopter blades...