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Crystallographic crack propagation rate in single-crystal nickel-base superalloys
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik och hållfasthetslära. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0003-1688-9732
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska fakulteten. Siemens Ind Turbomachinery AB, Sweden.
Fracture Anal Consultants Inc, NY USA.
Siemens Ind Turbomachinery AB, Sweden.
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2018 (Engelska)Ingår i: 12TH INTERNATIONAL FATIGUE CONGRESS (FATIGUE 2018), E D P SCIENCES , 2018, Vol. 165, artikel-id 13012Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Single-crystal nickel-base superalloys are often used in the hot sections of gas turbines due to their good mechanical properties at high temperatures such as enhanced creep resistance. However, the anisotropic material properties of these materials bring many difficulties in terms of modelling and crack growth prediction. Cracks tend to switch cracking mode from Mode I cracking to crystallographic cracking. Crystallographic crack growth is often associated with a decrease in crack propagation life compared to Mode I cracking and this must be taken into account for reliable component lifing. In this paper a method to evaluate the crystallographic crack propagation rate related to a crystallographic crack driving force parameter is presented. The crystallographic crack growth rate is determined by an evaluation of heat tints on the fracture surface of a specimen subjected to fatigue loading. The complicated crack geometry including two crystallographic crack fronts is modelled in a three dimensional finite element context. The crack driving force parameter is determined by calculating anisotropic stress intensity factors along the two crystallographic crack fronts by finite-element simulations and post-processing the data in a fracture mechanics tool that resolves the stress intensity factors on the crystallographic slip planes in the slip directions. The evaluated crack propagation rate shows a good correlation for both considered crystallographic cracks fronts.

Ort, förlag, år, upplaga, sidor
E D P SCIENCES , 2018. Vol. 165, artikel-id 13012
Serie
MATEC Web of Conferences, ISSN 2261-236X
Nationell ämneskategori
Infrastrukturteknik
Identifikatorer
URN: urn:nbn:se:liu:diva-159901DOI: 10.1051/matecconf/201816513012ISI: 000478990600114OAI: oai:DiVA.org:liu-159901DiVA, id: diva2:1346109
Konferens
12th International Fatigue Congress (FATIGUE)
Anmärkning

Funding Agencies|Swedish Energy Agency; Siemens industrial Turbomachinery AB through Research Consortium of Materials Technology for Thermal Energy Processes [KME-702]

Tillgänglig från: 2019-08-27 Skapad: 2019-08-27 Senast uppdaterad: 2019-09-23

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Busse, ChristianPalmert, FransLeidermark, Daniel
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Mekanik och hållfasthetsläraTekniska fakultetenKonstruktionsmaterial
Infrastrukturteknik

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