Research Papers: Gas Turbines: Structures and Dynamics

Investigation on Material's Fatigue Property Variation Among Different Regions of Directional Solidification Turbine Blades—Part I: Fatigue Tests on Full Scale Blades

[+] Author and Article Information
Xiaojun Yan

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China;
Collaborative Innovation Center of
Advanced Aero-Engine,
Beijing 100191, China
e-mail: yanxiaojun@buaa.edu.cn

Xia Chen

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: zuoweicat@126.com

Ruijie Sun

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: srj_0515@163.com

Ying Deng

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: yingdeng@sjp.buaa.edu.cn

Lianshan Lin

Oak Ridge National Laboratory,
Oak Ridge, TN 37831
e-mail: lianshanlin@hotmail.com

Jingxu Nie

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: buaa405@163.com

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 2, 2014; final manuscript received June 5, 2014; published online July 22, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(10), 102502 (Jul 22, 2014) (8 pages) Paper No: GTP-14-1262; doi: 10.1115/1.4027928 History: Received June 02, 2014; Revised June 05, 2014

At present, directional solidification (DS) made blades are commonly used in high performance turbine for their better high temperature mechanical, especially in creep properties compared with the equiaxed grain (EG) blades made by conventional casting method. To predict DS blades' fatigue life accurately, one of the practical ways is to conduct tests on full-scale blades in a laboratory/bench environment. In this investigation, two types of full scale turbine blades, which are made from DZ22B by DS method and K403 by conventional casting method, respectively, were selected to conduct high temperature combined low and high cycle fatigue (CCF) tests on a special design test rig, to evaluate the increase of fatigue life benefitted from material change. Experimental results show that different from EG blades, DS blades' fracture section is not located on the position where the maximum stress point lies. By comparing fatigue test results of the two types of blade, it can be found that the fatigue properties among different regions of the DS blade are different, and its fatigue damage is not only related to the stress field, but also affected by different parts material's fatigue properties.

Copyright © 2014 by ASME
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Fig. 1

A typical turbine blade

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Fig. 2

The static stress distribution: (a) DZ22B blade and (b) K403 blade

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Fig. 3

The dangerous vibration mode's stress distribution: (a) DZ22B blades and (b) K403 blades

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Fig. 4

Loading method and principle of the CCF test system: (a) directions of LCF and HCF loadings, (b) LCF loading transferring path, and (c) HCF loading transferring path. Notes: 1—outer clamp, 2—vibration exciting plate, 3—inner clamp, 4—test blade, 5—ball bearing, 6—real turbine disk, 7—electromagnetic exciter, 8—high-frequency eddy current induction coil, and 9—electron microscope.

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Fig. 5

LCF test calibration: (a) paste locations of the strain gauges and (b) comparisons between measured readings and FEM results

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Fig. 6

Schematic diagram of vibration amplitude monitoring

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Fig. 7

CCF test system: 1—high-frequency eddy current induction coil; 2—electromagnetic exciter; 3—electron microscope; 4—outer clamp; 5—low cycle loading links; 6—vibration exciting plate; 7—inner clamp; 8—ball bearing; 9—real turbine disk; 10—cooling water pipe; 11—disk fixing rod; and 12—test machine frame

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Fig. 8

CCF test load spectrum

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Fig. 9

Illustration of the reverse method

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Fig. 10

Main fracture positions of test blades

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Fig. 11

Fracture position statistics of DZ22B blades

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Fig. 12

The stress distribution of turbine blades without HCF load: (a) DZ22B blades and (b) K403 blades

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Fig. 13

Stress distribution comparison between position 1 and position 2: (a) DZ22B blade and (b) K403 blade

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Fig. 14

The approximate S-N curves of position 1 and position 2




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