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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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Figures

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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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