0
research-article

Effect of Aluminized Coating on Combined Low and High Cycle Fatigue (CCF) Life of Turbine Blade at Elevated Temperature

[+] Author and Article Information
Cao Chen

School of Energy and Power Engineering, Beihang University, Beijing 100191, China; AVIC CAPDI Integration Equipment Co., Ltd., Beijing 102206, China
c1990c@sina.com

Xiaojun Yan

School of Energy and Power Engineering, Beihang University, Beijing 100191, China; Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China; National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Beijing 100191, China; Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China
09744@buaa.edu.cn

Xiaoyong Zhang

School of Energy and Power Engineering, Beihang University, Beijing 100191, China; Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China; National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Beijing 100191, China; Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China
zhangxy@buaa.edu.cn

Yingsong Zhang

School of Energy and Power Engineering, Beihang University, Beijing 100191, China; Xiangyang Hangtai Power Machinery Factory, Xiangyang 441002, Hubei, China
chencao1990@yeah.net

Min Gui

Xiangyang Hangtai Power Machinery Factory, Xiangyang 441002, Hubei, China
zhangdalin2013@126.com

Min Tao

Xiangyang Hangtai Power Machinery Factory, Xiangyang 441002, Hubei, China
1565539656@qq.com

1Corresponding author.

ASME doi:10.1115/1.4041252 History: Received October 28, 2017; Revised August 07, 2018

Abstract

Some cracks were detected on the fir-tree root of turbine blade in an in-service aero-engine, and the aluminized coating was considered to be the main cause of these cracks. To study the effect of aluminized coating on fatigue life of turbine blade, the combined low and high cycle fatigue (CCF) tests are carried out at elevated temperature on both aluminized and untreated turbine blades. Probability analysis of test data is conducted and the result indicates that the median life is decreased by 62.2% due to the effect of the aluminized coating. Further study on the mechanism of crack initiation and propagation has been conducted based on fractography and cross-section morphology analysis by using scanning electron microscope (SEM), and the results indicate: 1) The aluminized coating consists of two layers, of which the inner layer is considered to contain the s phase and it reduces the resistance to fatigue of blade. 2) Many cavities are found in the inner layer of aluminized coating, which lead to the initiation of cracks and result in the reduction of crack initiation life. 3) The marker band widths of aluminized and untreated blade are very close, which indicated the aluminized coating may have no effect on the crack propagation life of the blade.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In