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The Role of Oxidized Carbides on Thermal-Mechanical Performance of Polycrystalline Superalloys
Max Planck Inst Eisenforsch GmbH, Germany.
Max Planck Inst Eisenforsch GmbH, Germany.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8304-0221
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2018 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 49A, no 9, p. 4236-4245Article in journal (Refereed) Published
Abstract [en]

Oxidized MC carbides which act as main crack initiation sites in a polycrystalline superalloy under thermal-mechanical fatigue (TMF) conditions at 850 degrees C were studied. Microstructural observations in the TMF tested specimens were compared to findings from bulk samples exposed isothermally in air at 850 degrees C for 30 hours in the absence of any external applied load. Carbides were found to oxidize rapidly after exposure at 850 degrees C for 30 hours resulting in surface eruptions corresponding to oxidation products, from where micro-cracks initiated. Plastic deformation due to volume expansion of the often porous oxidized carbides led to high dislocation densities in the adjacent matrix as revealed by controlled electron channeling contrast imaging. The high dislocation density facilitated the dissolution kinetics of gamma precipitates by segregation and diffusion of chromium and cobalt along the dislocations via pipe diffusion, resulting in the formation of soft recrystallized grains. Atom probe tomography revealed substantial compositional differences between the recrystallized grains and the adjacent undeformed gamma matrix. Similar observations were made for the TMF tested alloy. Our observations provide new insights into the true detrimental role of oxidized MC carbides on the crack initiation performance of polycrystalline superalloys under TMF.

Place, publisher, year, edition, pages
SPRINGER , 2018. Vol. 49A, no 9, p. 4236-4245
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-150480DOI: 10.1007/s11661-018-4709-xISI: 000440714700039OAI: oai:DiVA.org:liu-150480DiVA, id: diva2:1241748
Conference
3rd European Conference on Superalloys (Eurosuperalloys)
Note

Funding Agencies|Max Planck Society; Siemens Industrial Turbomachinery AB, Sweden; MPG; Swedish Energy Agency [KME-702]

Available from: 2018-08-24 Created: 2018-08-24 Last updated: 2018-09-11

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Segersäll, MikaelMoverare, Johan
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