Development of an accelerated test for pitting corrosion of CUSTOM 450 by rDHM

2021 ◽  
Vol 112 (8) ◽  
pp. 600-609
Author(s):  
Omid Pedram ◽  
Esmaeil Poursaeidi ◽  
Ramin Khamedi ◽  
Hassan Shayani-jam ◽  
Yousef Mollapour
Keyword(s):  
Gas Turbine ◽  
Pitting Corrosion ◽  
Three Dimensions ◽  
Accelerated Test ◽  
Compressor Blades ◽  
Constant Potential ◽  
Microscopy Method ◽  
Compressor Installation ◽  
The One ◽  
Gas Turbine Compressor

Abstract A key application of CUSTOM 450 alloy is in the construction of gas turbine compressor blades. The study of pitting corrosion can prevent the failure of many gas turbine compressor blades. In this study, a reflective digital holography microscopy method was employed to investigate the growth of pitting corrosion in depth. To this end, a constant potential of 350 mVSCE in a 3.5 wt.% NaCl solution was applied to the specimen. The generated pits were simulated in three dimensions, and it was indicated that pitting corrosion rate was decreased as time passed. Comparing the obtained experimental data with the data gathered from the real industrial environment surrounding a compressor installation, an accelerated test was proposed. By the proposed accelerated test, it is possible to produce a pit similar to the one that will be initiated and propagated at any time in the future in real conditions.

High Temperature Braze Repair for Compressor Blades

1997 ◽  
Author(s):  
Hans van Esch ◽  
Ernst Herren
Keyword(s):  
Mechanical Property ◽  
High Temperature ◽  
Fatigue Strength ◽  
Gas Turbine ◽  
Pitting Corrosion ◽  
Process Development ◽  
Mechanical Tests ◽  
Compressor Blades ◽  
Gas Turbine Compressor ◽  
Metallurgical Evaluation

This summary describes the repair and refurbishment process development for a set of compressor blades that suffered from heavy pitting corrosion. The objective was to restore the surface of the corroded blades and regain fatigue strength, while maintaining the proper airfoil profile. Metallurgical evaluation during the development and refurbishment indicated where improvements were needed and later on controlled the progress of the repair. Mechanical tests, such as fatigue and hardness, were performed to ensure that mechanical property criteria were met following the complete refurbishment of the blades. The resulting repair scheme is generic and can be used on most types of gas turbine compressor blades.

A Statistical Study on HCF Validation Data for Axial Gas Turbine Compressor Blades

2021 ◽  
Author(s):  
Lukas Schuchard ◽  
Stefano Cerutti ◽  
Matthias Voigt ◽  
Ronald Mailach
Keyword(s):  
Gas Turbine ◽  
Statistical Study ◽  
Compressor Blades ◽  
Validation Data ◽  
Gas Turbine Compressor

Failure Investigation of Frame 6FA Gas Turbine Compressor Blades

2015 ◽  
Vol 69 (2) ◽  
pp. 647-651 ◽  
Author(s):  
M. Swamy ◽  
Kulvir Singh ◽  
A. H. V. Pavan ◽  
Antony Harison M. C. ◽  
G. Jayaraman
Keyword(s):  
Gas Turbine ◽  
Compressor Blades ◽  
Failure Investigation ◽  
Gas Turbine Compressor

Determination of Vibration Amplitudes and Stresses Using the Holography Interference Techniques and Finite Element Method

1983 ◽  
Vol 105 (4) ◽  
pp. 484-488 ◽  
Author(s):  
Z. F. Fu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Gas Turbine ◽  
Strain Gage ◽  
Present Method ◽  
The Finite Element Method ◽  
Compressor Blades ◽  
Gas Turbine Compressor ◽  
Element Method

A new method which combines the holography interference technique with the finite element method for determining the distribution of vibration amplitudes and stresses of gas turbine compressor blades is presented in this paper. In comparison with the ordinary electrical strain gage method, the present method has the advantage that there is no limitation to the number of measuring points and good results can be obtained even at high order modes.

Vibration Amplitudes of Compressor Blades Resulting From Scatter in Blade Natural Frequencies

1969 ◽  
Vol 91 (3) ◽  
pp. 182-187 ◽  
Author(s):  
R. C. F. Dye ◽  
T. A. Henry
Keyword(s):  
Gas Turbine ◽  
Natural Frequency ◽  
Natural Frequencies ◽  
Model Analysis ◽  
Lumped Parameter Model ◽  
Compressor Blades ◽  
Lumped Parameter ◽  
Gas Turbine Compressor ◽  
Flexible Disk

Intercoupling between blades mounted on a flexible disk is examined employing a lumped-parameter model incorporating damping. Tests carried out on a gas turbine compressor and blades provide frequency and mass parameters for the model. Analysis of the model shows that vibration, and hence stress, in one or more blades, can be magnified if the distribution of blade natural frequency around the disk is suitably chosen. Feasible distributions are examined, leading to stress increases of up to 180 percent.

Aerodynamic Factors of Influence on the Resonance Vibration of Gas Turbine Compressor Blades

2015 ◽  
Vol 47 (5) ◽  
pp. 711-718 ◽  
Author(s):  
Yu. M. Tereshchenko ◽  
E. V. Doroshenko ◽  
A. Tehrani ◽  
J. Abolhassanzade
Keyword(s):  
Gas Turbine ◽  
Resonance Vibration ◽  
Compressor Blades ◽  
Factors Of Influence ◽  
Gas Turbine Compressor

Degradation of Compressor Blades of Gas Turbines in Coastal and Industrial Environment

2016 ◽  
Vol 1133 ◽  
pp. 371-375 ◽  
Author(s):  
Salmi Mohd Yunus ◽  
Saiful Adilin Sekari ◽  
Mohd Hafiz Abdul Ghaffar
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Turbine Unit ◽  
Oil Refinery ◽  
Oil Refining ◽  
Degradation Mechanisms ◽  
Gas Turbine Unit ◽  
Compressor Blades ◽  
Industrial Environment ◽  
Gas Turbine Compressor

Gas turbine compressor blades will age and degrade in their operation. There are a lot of factors that will contribute to the degradation mechanisms and its acceleration. These factors encompass the site location, the site conditions including the aspect of air quality, water washing practice, etc. A study undertaken by Materials Engineering Group of TNB Research Sdn Bhd on 2 units of gas turbine compressor those are located near to the sea around Peninsular of Malaysia, to determine the degradation mechanisms of the blades. All these gas turbine units are located in different industrial environment. The first gas turbine unit, so called GTA is located in coastal, petrochemicals production and crude oil refining environment. The second gas turbine unit, so called GTB, located in coastal and industrial environment. The surrounding industries of GTB including oil refinery, chemical, ship fabrication and etc. This paper reports the degradation type of those gas turbine units’ compressor blades with their contributing factors.

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