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Evaluation of the crystallographic fatigue crack growth rate in a single-crystal nickel-base superalloy
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Siemens Ind Turbomachinery AB, Sweden.
Siemens Ind Turbomachinery AB, Sweden.
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2019 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 127, p. 259-267Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 127, p. 259-267
Keywords [en]
Single-crystal nickel-base superalloys; Finite element analysis; Fracture mechanics; Stress intensity factor; Crystallographic cracking; Fatigue crack growth rate
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-160388DOI: 10.1016/j.ijfatigue.2019.05.023ISI: 000482492600024OAI: oai:DiVA.org:liu-160388DiVA, id: diva2:1353580
Note

Funding Agencies|Linkoping University; Siemens Industrial Turbomachinery AB

Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2019-11-19
In thesis
1. Modelling of Crack Growth in Single-Crystal Nickel-Base Superalloys
Open this publication in new window or tab >>Modelling of Crack Growth in Single-Crystal Nickel-Base Superalloys
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation was produced at the Division of Solid Mechanics at Linköping University and is part of a research project, which comprises modelling, microstructure investigations and material testing of cast nickel-base superalloys. The main objective of this work was to deepen the understanding of the fracture behaviour of single-crystal nickel-base superalloys and to develop a model to predict the fatigue crack growth behaviour. Frequently, crack growth in these materials has been observed to follow one of two distinct cracking modes; Mode I like cracking perpendicular to the loading direction or crystallographic crack growth on the octahedral {111}-planes, where the latter is associated with an increased fatigue crack growth rate. Thus, it is of major importance to account for this behaviour in component life prediction. Consequently, a model for the prediction of the transition of cracking modes and the correct active crystallographic plane, i.e. the crack path, and the crystallographic crack growth rate has been developed. This model is based on the evaluation of appropriate crack driving forces using three-dimensional finite-element simulations. A special focus was given towards the influence of the crystallographic orientation on the fracture behaviour. Further, a model to incorporate residual stresses in the crack growth modelling is presented. All modelling work is calibrated and validated by experiments on different specimen geometries with different crystallographic orientations. This dissertation consists of two parts, where Part I gives an introduction and background to the field of research, while Part II consists of six appended papers.

Abstract [de]

Die vorliegende Dissertation wurde in der Abteilung für Festigkeitslehre an der Universität von Linköping erstellt und ist Teil eines Forschungsprojektes, welches Modellierung, Mikrostrukturuntersuchungen und Materialtests von gegossenen nickelbasierten Superlegierungen umfasst.

Das Hauptziel dieser Arbeit war es, das Verständnis des Bruchverhaltens von einkristallinen Superlegierungen auf Nickelbasis zu vertiefen und ein Modell zur Vorhersage des Wachstumsverhaltens von Ermüdungsrissen zu entwickeln. Es wurde beobachtet, dass das Risswachstum in diesen Materialien einem von zwei unterschiedlichen Rissmodi folgt; Modus I Rissfortschritt senkrecht zur Belastungsrichtung oder kristallographisches Risswachstum auf den oktaedrischen f111g-Ebenen, wobei letzteres mit einer erhöhten Ermüdungsrisswachstumsrate verbunden ist. Somit ist es von grosser Bedeutung dieses Verhalten in der Lebensdauervorhersage einer Komponente zu berücksichtigen. Demzufolge wurde ein Modell für die Vorhersage des Übergangs zwischen den Rissmodi und der korrekten aktiven kristallographischen Ebene, d.h. des Risspfades, sowie der kristallographischen Risswachstumsrate erarbeitet. Dieses Modell basiert auf geeigneten Rissantriebskräften, welche mit Hilfe dreidimensionaler Finite-Elemente-Simulationen berechnet werden. Im Fokus stand insbesondere der Einuss der kristallographischen Orientierung auf das Bruchverhalten. Ausserdem wird ein Modell zur Berücksichtigung von Restspannungen in der Risswachstumsmodellierung präsentiert. Alle Modellierungsarbeiten wurden durch Experimente an verschiedenen Probengeometrien mit unterschiedlichen kristallographischen Orientierungen kalibriert und validiert.

Diese Dissertation besteht aus zwei Teilen, wobei Teil I aus einer Einführung und einem Hintergrund in das Forschungsgebiet und Teil II aus sechs beigefügten Forschungsartikeln besteht.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2019. p. 55
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2023
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-160477 (URN)10.3384/diss.diva-160477 (DOI)9789179299835 (ISBN)
Public defence
2019-12-13, Planck, E-House, Campus Valla, Linköping, 10:15 (English)
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Available from: 2019-09-24 Created: 2019-09-23 Last updated: 2019-11-19Bibliographically approved

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