scholarly journals Corrosion Resistance of Modified Heat-Treated 16Cr-4Ni Steel for Geothermal Steam Turbine Blades

2019 ◽  
Vol 23 (4) ◽  
pp. 213-221
Author(s):  
Li-Bin Niu ◽  
Yang Xiao ◽  
Kunio Shiokawa ◽  
Mitsuo Yamashita ◽  
Yoshihiro Sakai
Keyword(s):  
Corrosion Resistance ◽  
Steam Turbine ◽  
Turbine Blades ◽  
Heat Treated ◽  
Steam Turbine Blades

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.

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.

Diagnostics and monitoring of the operating condition of steam-turbine blades

2007 ◽  
Vol 41 (5) ◽  
pp. 295-301
Author(s):  
A. I. Danilin ◽  
S. I. Adamov ◽  
A. Zh. Chernyavskii ◽  
M. I. Serpokrylov
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Operating Condition ◽  
Steam Turbine Blades

Water-droplet erosion behavior of high-velocity oxygen-fuel-sprayed coatings for steam turbine blades

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Dingjun Li ◽  
Peng Jiang ◽  
Fan Sun ◽  
Xiaohu Yuan ◽  
Jianpu Zhang ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Water Droplet ◽  
Erosion Resistance ◽  
Turbine Blades ◽  
Impingement Angle ◽  
Erosion Behavior ◽  
Water Droplet Erosion ◽  
Steam Turbine Blades ◽  
Oxygen Fuel ◽  
Sprayed Coatings

Abstract The water-droplet erosion of low-pressure steam turbine blades under wet steam environments can alter the vibration characteristics of the blade, and lead to its premature failure. Using high-velocity oxygen-fuel (HVOF) sprayed water-droplet erosion resistant coating is beneficial in preventing the erosion failure, while the erosion behavior of such coatings is still not revealed so far. Here, we examined the water-droplet erosion resistance of Cr3C2–25NiCr and WC–10Co–4Cr HVOF sprayed coatings using a pulsed water jet device with different impingement angles. Combined with microscopic characterization, indentation, and adhesion tests, we found that: (1) both of the coatings exhibited a similar three-stage erosion behavior, from the formation of discrete erosion surface cavities and continuous grooves to the broadening and deepening of the groove, (2) the erosion rate accelerates with the increasing impingement angle of the water jet; besides, the impingement angle had a nonlinear effect on the cumulative mass loss, and 30° sample exhibited the smallest mass loss per unit area (3) an improvement in the interfacial adhesion strength, fracture toughness, and hardness of the coating enhanced the water-droplet erosion resistance. These results provide guidance pertaining to the engineering application of water erosion protective coatings on steam turbine blades.

Titanium steam turbine blades

JOM ◽  
1989 ◽  
Vol 41 (3) ◽  
pp. 31-35
Author(s):  
R.R. Jaffee
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Steam Turbine Blades

Corrosive resistance of nitride coatings of steam turbine blades

2009 ◽  
Vol 56 (2) ◽  
pp. 91-96 ◽  
Author(s):  
V. I. Nikitin ◽  
A. M. Smyslov ◽  
A. S. Lisyanskii ◽  
M. K. Smyslova ◽  
O. N. Simin ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Nitride Coatings ◽  
Steam Turbine Blades ◽  
Corrosive Resistance

Brazed coatings for steam turbine blades: impact of the tape architecture and composition on mechanical properties

2020 ◽  
Vol 111 (11) ◽  
pp. 916-922
Author(s):  
K. Bobzin ◽  
W. Wietheger ◽  
J. Hebing ◽  
L. Gerdt ◽  
H. Krappitz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Steam Turbine ◽  
Volume Fraction ◽  
Steel Substrate ◽  
Turbine Blades ◽  
Surface Hardness ◽  
Three Point Bending ◽  
Wear And Corrosion ◽  
Steam Turbine Blades ◽  
Positive Effect

Abstract Ni-based brazing coatings with tungsten or chromium carbides are used for wear and corrosion protection in various applications. Steam turbine blades especially present a highly stressed application in which in particular the resistance to erosion and corrosion is essential. Therefore, novel tape architectures of brazed coatings have been developed and investigated within this study. In contrast to the use of powders, the application by means of tapes offers a high potential with regard to later use in industry due to the reproducible handling and automation. In this work, different coating systems were successfully deposited by means of vacuum brazing on X12CrNiMo-12 steel substrate. In order to achieve a sufficient fracture toughness of the coatings, pure nickel powder was added to the tapes. The influence of this additive on the mechanical properties was analyzed by means of three-point bending tests. A positive effect has been observed when adding a volume fraction of φ(Ni) = 25% of nickel, increasing the flexural strength up to σf = 580 MPa. Furthermore, the surface hardness of the coating has been analyzed depending on coating architecture and post-deposition treatment by grinding.

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