Evaluation of the crystallographic fatigue crack growth rate in a single-crystal nickel-base superalloy

•Development of a method to evaluate the fatigue crack growth rate of crystallographic cracks in a single-crystal nickel-base superalloy.•Applicable to 3D models with arbitrary material orientation and crack front shapes.•Prediction of crystallographic fatigue crack growth rate.•Calibrated by labora...

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Bibliographic Details
Published in:International journal of fatigue 2019-10, Vol.127, p.259-267
Main Authors: Busse, C., Palmert, F., Sjödin, B., Almroth, P., Gustafsson, D., Simonsson, K., Leidermark, D.
Format: Article
Language:English
Subjects:
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Crack propagation
Crystallographic cracking
Crystallography
Data points
Fatigue crack growth rate
Fatigue cracks
Fatigue failure
Finite element analysis
Fracture mechanics
Fracture surfaces
Materials fatigue
Nickel
Nickel base alloys
Single crystals
Single-crystal nickel-base superalloys
Stress intensity factor
Superalloys
Three dimensional models
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Summary:•Development of a method to evaluate the fatigue crack growth rate of crystallographic cracks in a single-crystal nickel-base superalloy.•Applicable to 3D models with arbitrary material orientation and crack front shapes.•Prediction of crystallographic fatigue crack growth rate.•Calibrated by laboratory tests.•Modeling of complex 3D crack geometries. Cracks in single-crystal nickel-base superalloys have been observed to switch cracking mode from Mode I to crystallographic cracking. The crack propagation rate is usually higher on the crystallographic planes compared to Mode I, which is important to account for in crack growth life predictions. In this paper, a method to evaluate the crystallographic fatigue crack growth rate, based on a previously developed crystallographic crack driving force parameter, is presented. The crystallographic crack growth rate was determined by evaluating heat tints on the fracture surfaces of the test specimens from the experiments. Complicated crack geometries including multiple crystallographic crack fronts were modelled in a three dimensional finite element context. The data points of the crystallographic fatigue crack growth rate collapse on a narrow scatter band for the crystallographic cracks indicating a correlation with the previously developed crystallographic crack driving force.
ISSN:0142-1123
1879-3452
1879-3452
DOI:10.1016/j.ijfatigue.2019.05.023