Research Papers: Gas Turbines: Structures and Dynamics

Scatter in Dwell Time Cracking for a Ni-Based Superalloy in Combination With Overloads

[+] Author and Article Information
Erik Storgärds

Division of Solid Mechanics,
Linköping University,
Linköping SE-58183, Sweden
e-mail: erik.storgards@liu.se

Jonas Saarimäki, Johan Moverare

Division of Engineering Materials,
Linköping University,
Linköping SE-58183, Sweden

Kjell Simonsson, Sören Sjöström

Division of Solid Mechanics,
Linköping University,
Linköping SE-58183, Sweden

David Gustafsson

Siemens Industrial Turbomachinery AB,
Finspång SE-61283, Sweden

Tomas Månsson

GKN Aerospace Engine Systems,
Trollhättan SE-46181, Sweden

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 July 15, 2015; final manuscript received July 20, 2015; published online August 12, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(1), 012502 (Aug 12, 2015) (7 pages) Paper No: GTP-15-1328; doi: 10.1115/1.4031157 History: Received July 15, 2015

In this paper, scatter in crack growth for dwell time loadings in combination with overloads has been investigated. Multiple tests were performed for surface cracks at 550 °C in the commonly used high temperature material Inconel 718. The test specimens originate from two different batches which also provide for a discussion of how material properties affect the dwell time damage and overload impact. In combination with these tests, an investigation of the microstructure was also carried out, which shows how it influences the growth rate. The results from this study show that, in order to take overloads into consideration when analyzing spectrum loadings containing dwell times, one needs a substantial amount of material data available as the scatter seen from one batch to the other are of significant proportions.

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Larsen, J. , and Nicholas, T. , 1983, “Load Sequence Crack Growth Transients in a Superalloy at Elevated Temperature,” 14th National Symposium on Fracture Mechanics, Los Angeles, CA, June 30–July 2, Vol. II: Testing and Applications, ASTM STP 791, pp. II-536–II-552.
Nicholas, T. , and Weerasooriya, T. , 1986, “ Hold-Time Effects in Elevated Temperature Fatigue Crack Propagation,” 17th National Symposium on Fracture Mechanics, ASTM STP 905, Albany, NY, Aug. 7–9, 1984, pp. 155–168.
Weerasooriya, T. , 1987, “Effect of Frequency on Fatigue Crack Growth Rate of Inconel 718 at High Temperature,” Air Force Wright Aeronautical Laboratories Report, Wright-Patterson Air Force Base, OH, Technical Report No. AFWAL-TR-87-4038.
Andrieu, E. , Molins, R. , Ghonem, H. , and Pineau, A. , 1992, “Intergranular Crack Tip Oxidation Mechanism in a Nickel-Based Superalloy,” Mater. Sci. Eng., A, 154(1), pp. 21–28. [CrossRef]
Ghonem, H. , Nicholas, T. , and Pineau, A. , 1993, “Elevated Temperature Fatigue Crack Growth in Alloy 718—Part I: Effects of Mechanical Variables,” Fatigue Fract. Eng. Mater. Struct., 16(5), pp. 565–576. [CrossRef]
Krupp, U. , 2005, “Dynamic Embrittlement—Time-Dependent Quasi-Brittle Intergranular Fracture at High Temperatures,” Int. Mater. Rev., 50(2), pp. 83–97. [CrossRef]
Woodford, D. A. , 2006, “Gas Phase Embrittlement and Time Dependent Cracking of Nickel Based Superalloys,” Energy Mater., 1(1), pp. 59–79. [CrossRef]
Ghonem, H. , and Zheng, D. , 1992, “Depth of Intergranular Oxygen Diffusion During Environment-Dependent Fatigue Crack Growth in Alloy 718,” Mater. Sci. Eng., A, 150(2), pp. 151–160. [CrossRef]
Molins, R. , Hochstetter, G. , Chassaigne, J. C. , and Andrieu, E. , 1997, “Oxidation Effects on the Fatigue Crack Growth Behaviour of Alloy 718 at High Temperature,” Acta Mater., 45(2), pp. 663–674. [CrossRef]
Liu, X. B. , Ma, L. Z. , Chang, K. M. , and Barbero, E. , 2005, “Fatigue Crack Propagation of Ni-Based Superalloys,” Acta Metall. Sin., 18(1), pp. 55–64.
Gustafsson, D. , and Lundström, E. , 2013, “High Temperature Fatigue Crack Growth Behaviour of Inconel 718 Under Hold Time and Overload Conditions,” Int. J. Fatigue, 48, pp. 178–186. [CrossRef]
Ponnelle, S. , Brethes, B. , and Pineau, A. , 2002, “High Temperature Fatigue Crack Growth Rate in Inconel 718: Dwell Effect Annihilations,” European Structural Integrity Society, Elsevier, Vol. 29, pp. 257–266.
Nicholas, T. , Haritos, G. , Hastie, R., Jr. , and Harms, K. , 1991, “The Effect of Overloads on Sustained-Load Crack Growth in a Nickel-Base Superalloy: Part II—Experiments,” Theor. Appl. Fract. Mech., 16(1), pp. 51–62. [CrossRef]
Wanhill, R. , 2002, “Significance of Dwell Cracking for IN718 Turbine Discs,” Int. J. Fatigue, 24(5), pp. 545–555. [CrossRef]
ASTM, 2008, “Standard Test Method for Measurement of Fatigue Crack Growth Rates,” ASTM International, West Conshohocken, PA, ASTM Standard No. E647-08.
Newman, J. C., Jr. , and Raju, I. S. , 1984, “ Stress-Intensity Factor Equations for Cracks in Three-Dimensional Finite Bodies Subjected to Tension and Bending Loads,” NASA Langley Research Center, Hampton, VA, NASA Technical Memorandum No. 85793.
Lundström, E. , Simonsson, K. , Gustafsson, D. , and Månsson, T. , 2014, “A Load History Dependent Model for Fatigue Crack Propagation in Inconel 718 Under Hold Time Conditions,” Eng. Fract. Mech., 118, pp. 17–30. [CrossRef]
Saarimäki, J. , Moverare, J. , Eriksson, R. , and Johansson, S. , 2014, “Influence of Overloads on Dwell Time Fatigue Crack Growth in Inconel 718,” Mater. Sci. Eng., A, 612, pp. 398–405. [CrossRef]
Gutierrez-Urrutia, I. , Zaefferer, S. , and Raabe, D. , 2009, “Electron Channeling Contrast Imaging of Twins and Dislocations in Twinning-Induced Plasticity Steels Under Controlled Diffraction Conditions in a Scanning Electron Microscope,” Scr. Mater., 61(7), pp. 737–740. [CrossRef]
Viskari, L. , Cao, Y. , Norell, M. , Sjöberg, G. , and Stiller, K. , 2011, “Grain Boundary Microstructure and Fatigue Crack Growth in Allvac 718Plus Superalloy,” Mater. Sci. Eng., A, 528(6), pp. 2570–2580. [CrossRef]
Lenets, Y. N. , 2012, “Practical Aspects of Fatigue Crack Growth in Aero-GTE Applications,” ASME Paper No. GT2012-68736.
Storgärds, E. , and Simonsson, K. , 2015, “Crack Length Evaluation for Cyclic and Sustained Loading at High Temperature Using Potential Drop,” Exp. Mech., 55(3), pp. 559–568. [CrossRef]


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Fig. 1

Drawing of the Kb-specimen with the rectangular cross section, dimensions in mm

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Fig. 2

Schematic illustrations of the different test types plotted as load versus time. (a) Cyclic test, (b) dwell test, (c) 2160 s test, (d) 2160 s test with overload, (e) block type A, (f) block type B, and (g) block type C.

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Fig. 3

Results for the dwell tests, a zoom in on the crack growth rate trend lines is also included

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Fig. 4

Growth rate comparison between dwell tests and 2160 s tests

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Fig. 5

Overload tests versus nonoverload tests, all for 2160 s dwell if not otherwise marked. (a) Batch 1, (b) batch 2, and (c) trend lines for batches 1 and 2.

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Fig. 6

Results for the block tests for batches 1 and 2, including results for dwell tests without overload. (a) Growth rate and (b) crack length versus time.

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Fig. 7

Microstructure for (a) batch 1 and (b) batch 2



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