scholarly journals Increasing the corrosion resistance of turbine

2021 ◽  
pp. 91
Author(s):  
Diana Hlushkova ◽  
Valeriy Bagrov ◽  
Elena Hrinchenko ◽  
Andrey Stepaniyk ◽  
Anastasiya Hnatiyk ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Ph Value ◽  
Chemical Elements ◽  
Turbine Blades ◽  
Working Environment ◽  
Working Fluid ◽  
Electrospark Alloying ◽  
Steam Turbines ◽  
Wet Steam Flow

The reliability of the vane apparatus of steam turbines largely determines the operation of the turbine as a whole. The results of scientific research indicate that the surface operation of the blades in the wet - steam flow is caused by a combination of corrosion and drip erosion. The presence of chemical elements and compounds in the working fluid intensifies the process of blade wear. The pH value of the working environment, which can fluctuate significantly during operation, has a significant effect on the wear characteristics. The influence of methods of strengthening the leading edges of steam turbine blades made of steel is analyzed 15Х11МФ on corrosion resistance. Corrosion tests of blade samples were carried out, the inlet edges of which were strengthened in three ways: high current amplification, electrospark alloying with T15K6 alloy, electrospark alloying with steel 15Х11МФ According to the results of the tests, the layer strengthened by hardening by high-frequency currents has the lowest corrosion rate, the layer strengthened by electrospark alloying with T15K6 hard alloy has the highest. The corrosion rate of the layer reinforced by electrospark alloying of steel 15H11MF is 2.1 less than that of the layer reinforced with T15K6 alloy.

scholarly journals CORROSION RESISTANCE OF REINFORCED LAYERS OF 15Х11МФ STEEL STEAM TURBINE BLADES

2021 ◽  
pp. 136-141
Author(s):  
D.B. Hlushkova ◽  
V.A. Bahrov ◽  
O.D. Hrinchenko ◽  
A.A. Hnatiuk ◽  
N.E. Kalinina ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Steam Turbine ◽  
Ph Value ◽  
Chemical Elements ◽  
Turbine Blades ◽  
Working Environment ◽  
Working Fluid ◽  
Electrospark Alloying ◽  
Steam Turbine Blades

The reliability of the vane apparatus of steam turbines largely determines the operation of the turbine as a whole. The results of scientific research indicate that the surface operation of the blades in the wet-steam flow is caused by a combination of corrosion and drip erosion. The presence of chemical elements and compounds in the working fluid intensifies the process of blade wear. The pH value of the working environment, which can fluctuate significantly during operation, has a significant effect on the wear characteristics. The influence of methods of strengthening the leading edges of steam turbine blades made of steel is analyzed 15H11MF on corrosion resistance. Corrosion tests of blade samples were carried out, the inlet edges of which were strengthened in three ways: high current amplification, electrospark alloying with T15K6 alloy, electrospark alloying with steel 15H11MF. According to the results of the tests, the layer strengthened by hardening by high-frequency currents has the lowest corrosion rate, the layer strengthened by electrospark alloying with T15K6 hard alloy has the highest. The corrosion rate of the layer reinforced by electrospark alloying of steel 15H11MF is 2.1 less than that of the layer reinforced with T15K6 alloy.

Corrosion Resistance of High-Alloyed Material UNS N08028 in Sodium Chloride Solution

2014 ◽  
Vol 893 ◽  
pp. 440-443
Author(s):  
Li Na Zhang ◽  
Jerzy A. Szpunar ◽  
Jian Xin Dong ◽  
Mai Cang Zhang
Keyword(s):  
Corrosion Resistance ◽  
Sodium Chloride ◽  
Corrosion Rate ◽  
Current Density ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Corrosion Potential ◽  
Ph Value ◽  
Chloride Concentration ◽  
Decreasing Ph

The influence of ions chloride concentration and pH value on the corrosion resistance of high-alloyed material UNS N08028 in the sodium chloride solution is investigated. Results show that the corrosion potential is active cathodically with the increase of chloride concentration. The current density and corrosion rate both increase with increasing chloride concentration and decreasing pH value.

Paper 38: Water Drainage from a Cascade of Hollow Slotted Low-Pressure Turbine Blades

1967 ◽  
Vol 182 (8) ◽  
pp. 357-365 ◽  
Author(s):  
D. H. McAllister ◽  
C. T. Moore
Keyword(s):  
High Speed ◽  
Turbine Blades ◽  
Rotor Blades ◽  
Working Fluid ◽  
Steam Turbines ◽  
Water Drainage ◽  
Low Pressure Turbine ◽  
Wide Range ◽  
Trailing Edges ◽  
Hollow Cavity

To prevent or minimize the erosion of the last row rotor blades in large high-speed steam turbines it has been proposed to remove the film of water on the surfaces of the last row stator blades before it reaches the trailing edges and is swept off by the steam drag into the path of the rotor blades. The paper describes experiments with a cascade of hollow stator blades with various dispositions of slots providing communication from the blade surfaces to the hollow cavity. The same cascade was used in turn with three different wet air tunnels, the experiments thus covering a wide range of Mach number and Reynolds number. With suitably disposed slots, and bleeding a very small proportion of the working fluid, about 90 per cent of the deleterious water can be removed, thus preventing it from striking the moving blades.

Effect of Elemental Sulfur on Corrosion Behavior of Super 13Cr Martensitic Stainless Steel

2014 ◽  
Vol 556-562 ◽  
pp. 162-165 ◽  
Author(s):  
Shi Dong Zhu ◽  
Hai Xia Ma ◽  
Jin Ling Li ◽  
Zhi Gang Yang
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Elemental Sulfur ◽  
Martensitic Stainless Steel ◽  
Chemical Elements ◽  
Different Temperatures ◽  
Corrosion Scales

Effects of elemental sulfur on corrosion behavior of super 13Cr martensitic stainless steel were investigated by utilizing weight loss test, and the micro morphologies and chemical elements of corrosion scales were characterized by using SEM and EDS. The results showed that corrosion resistance of super 13Cr stainless steel was aggravated by the hydrolytic action of sulfur, the corrosion rate of super 13Cr stainless steel increased with the increasing of sulfur content, and firstly increased and then decreased with the increasing of temperature due to the activated adsorption and existential state of sulfur at the different temperatures.

Eulerian-Lagrangian Numerical Simulation of Wet Steam Flow Through Multi-Stage Steam Turbine

2013 ◽  
Author(s):  
Yasuhiro Sasao ◽  
Satoshi Miyake ◽  
Kenji Okazaki ◽  
Satoru Yamamoto ◽  
Hiroharu Ooyama
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Steam Flow ◽  
Droplet Growth ◽  
Computational Domain ◽  
Steam Turbines ◽  
Wet Steam ◽  
Multi Stage ◽  
Flow Through ◽  
Wet Steam Flow

In this paper, we present an inclusive tracking algorithm for water droplets in a wet steam flow through a multi-stage steam turbine. This algorism is based on the Eulerian-Lagrangian coupled solver. The solver continuously computes water droplet growth, kinematic non-equilibrium between vapor and droplets, capture and kinetics of droplets on turbine blades, departure of large droplets from the trailing edge of blades, acceleration and atomization of large droplets, and recollisions between blades and droplets. Our Eulerian-Lagrangian coupled solver is used to predict wetness in unsteady three-dimensional (3D) wet steam flows through three-stage stator rotor cascade channels in a low pressure (LP) steam turbine model which is developed by Mitsubishi Heavy Industries (MHI). Droplet groups tracked by the discrete droplet model (DDM) are placed in the computational domain according to the predicted wetness. Interference from the gas phase on the droplets is considered, to track their kinetic and behavior, until they reach the outlet of the computational domain. The aim of this research is to investigate those multi-physics phenomena that trigger all forms of loss in steam turbines. In addition, this method will also be applied to multi-physics problems such as erosion in future work. This paper is presented as a first step in the research. Overviews of model of current coupling solver and several test calculations are presented.

scholarly journals Investigation on corrosion behavior of cryogenically treated friction stir welded AA5083

Mechanika ◽  
2020 ◽  
Vol 26 (5) ◽  
pp. 442-449
Author(s):  
Vasudevan NEELAMEGAM ◽  
Bhaskar GOVINDASAMY BHAVANI ◽  
Mohandass MUTHUKRISHNAN ◽  
Srinivasa Rao TADIVAKA
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Ph Value ◽  
Cryogenic Treatment ◽  
Base Material ◽  
Fusion Welding ◽  
Friction Stir ◽  
State Process ◽  
Welding Processes

The aluminum alloy 5083 is widely used as a structural material in marine applications due to very good corrosion resistance and low temperature mechanical properties. Friction stir welding, being a solid state process, offers several benefits over the traditional fusion welding processes. In this study, 10 mm thick AA5083–H321 plates were successfully friction stir welded and the welds were investigated for corrosion behavior using salt fog corrosion tests. The friction stir welds exhibited more corrosion rate compared to that of the base material. However, the corrosion rate was observed to decrease with increase in time of exposure. The cryogenic treatment was found to improve corrosion resistance of the base material and the welds. Furthermore, the corrosion rate increases with decrease in pH value of the salt solution. By and large, it is determined that the cryogenic treatment advantageously effects the corrosion behavior

scholarly journals Corrosion Resistance Evaluation of Some Stainless Steels Used in Manufacture of Hydraulic Turbine Runner Blades

2019 ◽  
Vol 70 (7) ◽  
pp. 2491-2496 ◽  
Author(s):  
Cristian Predescu ◽  
Andrei Constantin Berbecaru ◽  
George Coman ◽  
Mirela Gabriela Sohaciu ◽  
Andra Mihaela Predescu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Corrosion Rate ◽  
Stainless Steels ◽  
Turbine Blades ◽  
Hydraulic Turbine ◽  
Resistance Testing ◽  
General Corrosion ◽  
Steel Grades ◽  
Corrosion Pits

The paper presents corrosion resistance testing results of three stainless steels that may be used in hydropower turbine blades manufacture. Two of these have a chemical composition close to that of some other stainless steels previously employed in producing these parts, being updated steel grades of the former ones. The third one is of a new conception, having a chemical composition close to that of a maraging steel. The three materials were produced in an induction furnace with cold copper crucible under vacuum and argon atmosphere in order to obtain improved mechanical and corrosion resistance characteristics as well as an inclusion � free structure. Quenching and tempering heat treatments were subsequently applied. Tests were carried out at room temperature in normally aerated 1N Na2SO4 and 3% NaCl solutions. Corrosion rates were calculated using the Tafel slope method. All steels have a passivation tendency in a chlorine-free aqueous medium. The newly conceived steel has a more pronounced anodic field as a result of a chromium content below 12%. However, the general corrosion behavior of this material is rebalanced by the content of about 10% Ni which leads to a mainly martensitic structure in quenched state. The corrosion rate values obtained for all samples enframe the three materials in highly and very highly corrosion resistant steels. Nevertheless it must be specified that in chlorine environments the overall corrosion rate is not a sensitive indicator of corrosion resistance performance due to the local depassivation process followed by corrosion pits.

UDIMET L-605

Alloy Digest ◽  
2004 ◽  
Vol 53 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Gas Turbine ◽  
Oxidation Resistance ◽  
Turbine Blades ◽  
Heat Treating ◽  
Gas Turbine Blades ◽  
Temperature Performance

Abstract Udimet L-605 is a high-temperature aerospace alloy with excellent strength and oxidation resistance. It is used in applications such as gas turbine blades and combustion area parts. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: CO-109. Producer or source: Special Metals Corporation.

FIRTH-VICKERS F.V.520B

Alloy Digest ◽  
1965 ◽  
Vol 14 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Martensitic Stainless Steel ◽  
Turbine Blades ◽  
Heat Treating ◽  
Good Corrosion Resistance ◽  
Temperature Performance ◽  
Temperature Heat ◽  
Steam Turbine Blades ◽  
Temperature Heat Treatment

Abstract F.V.520B is an improved martensitic stainless steel which has good corrosion resistance, weldability, and capacity of being hardened by low temperature heat treatment. It is recommended for steam turbine blades and aircraft components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-166. Producer or source: Firth-Vickers Stainless Steels Ltd.

COOPER ALLOY 22W

Alloy Digest ◽  
1963 ◽  
Vol 12 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Creep Rate ◽  
Corrosion Rate ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
Casting Alloy ◽  
Hot Gas ◽  
Gas Corrosion ◽  
Very High

Abstract Cooper Alloy 22W is a high strength, heat resistant casting alloy with a low creep rate. It is recommended for heat applications where stress and hot gas corrosion rate are very high. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as casting, heat treating, machining, joining, and surface treatment. Filing Code: SS-146. Producer or source: Cooper Alloy Corporation.

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