scholarly journals Improvement of the Turbine Blade Surface Phase Structure Recovered by Plasma Spraying

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 62
Author(s):  
Vitalii V. Savinkin ◽  
Petrica Vizureanu ◽  
Andrei Victor Sandu ◽  
Tatyana Yu. Ratushnaya ◽  
Andrey A. Ivanischev ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Phase Structure ◽  
Turbine Blades ◽  
Fine Tuning ◽  
Technological Parameters ◽  
Martensitic Class ◽  
Class Steel ◽  
Steam Turbine Blades ◽  
Implantation Method

This paper presents the results of research on the construction, technological parameters and criteria that control the process of formation of optimal phase structure of austenitic- and martensitic-class material for steam turbine blades. The hypothesis that the established correlation could increase the quality of blade recovery and its resistance against dynamic and vibrational loads was proved. The efficiency of the developed implantation method for the recovery of steam turbine blades was demonstrated. The optimal technological parameters of the process of laser plasma recovery were established empirically, allowing the development of the system for the fine tuning of the phase composition of austenitic- and martensitic-class steel.

Study on the optimal phase structure of recovered steam turbine blades using different technological spray modes for deposition of Al2O3

2019 ◽  
Author(s):  
V. V. Savinkin ◽  
T. Yu. Ratushnaya ◽  
A. A. Ivanischev ◽  
A. R. Surleva ◽  
O. V. Ivanova ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Phase Structure ◽  
Turbine Blades ◽  
Steam Turbine Blades

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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