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Research Papers

Extrapolation Techniques for Very Low Cycle Fatigue Behavior of a Ni-base Superalloy

[+] Author and Article Information
Brian R. Daubenspeck

Department of Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450daubenspeck@knights.ucf.edu

Ali P. Gordon

Department of Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450apgordon@mail.ucf.edu

J. Eng. Mater. Technol 133(2), 021023 (Mar 23, 2011) (9 pages) doi:10.1115/1.4003602 History: Received May 20, 2010; Revised January 18, 2011; Published March 23, 2011; Online March 23, 2011

A combination of extrapolation and estimation techniques from both prior and current studies has been explored with the goal of developing a method to accurately characterize high-stress amplitude low cycle fatigue of a material commonly used in gas turbine blades with the absence of such data. This paper describes innovative methods used to predict high-temperature fatigue of IN738LC, a dual-phase Ni-base superalloy. Three sets of experimental data at different temperatures are used to evaluate and examine the validity of extrapolation methods such as anchor points and hysteresis energy trends. High-stress amplitude data points approaching the ultimate strength of the material were added to pre-existing base data with limited plastic strain to achieve a full-range data set that could be used to test the legitimacy of the different prediction methods. Each method is evaluated at a number of temperatures.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical LCF test data for a Ni-base superalloy

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Figure 2

Material properties of IN738LC as functions of temperature (9,16)

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Figure 3

Test specimen used in the current study (inches)

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Figure 4

Un-normalized strain-life data gathered from various sources (10,19-22)

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Figure 5

Stress histories for specimens D912-14 and D912-15 at 750°C and 850°C, respectively

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Figure 6

Hysteresis loops for specimens D912-14 and D912-15 at 750°C and 850°C, respectively

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Figure 7

Comparison of the strain-life models and hysteresis energy-life data regression at 24°C

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Figure 8

Comparison of the strain-life models and hysteresis energy-life data regression at 750°C

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Figure 9

Comparison of the strain-life models and hysteresis energy-life data regression at 850°C

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Figure 10

Comparison of the predicted and experimental life via the various models

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