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Influence of High-Temperature Exposure on the Microstructure of ATI 718Plus Superalloy Studied by Electron Microscopy and Tomography Techniques.

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Title: Influence of High-Temperature Exposure on the Microstructure of ATI 718Plus Superalloy Studied by Electron Microscopy and Tomography Techniques.
Authors: Lech, Sebastian1 (AUTHOR) slech@agh.edu.pl, Kruk, Adam1 (AUTHOR), Cempura, Grzegorz1 (AUTHOR), Gruszczyński, Adam1 (AUTHOR), Gil, Aleksander2 (AUTHOR), Agüero, Alina3 (AUTHOR), Wusatowska-Sarnek, Agnieszka M.4 (AUTHOR), Czyrska-Filemonowicz, Aleksandra1 (AUTHOR)
Source: Journal of Materials Engineering & Performance. Mar2020, Vol. 29 Issue 3, p1453-1459. 7p.
Subjects: Electron microscope techniques, Three-dimensional imaging, Heat resistant alloys, Microstructure, Crystal grain boundaries, Nickel alloys
Abstract: The changes in ATI® 718Plus™ (718Plus) superalloy microstructure after high-temperature long-term exposure (850 °C/4000 h/air) were characterized by two- and three-dimensional imaging techniques. The 718Plus microstructure consists of a γ-matrix strengthened by coherent γ′-phase and plate-like η-phase at grain boundaries. The η-phase analysis showed the presence of δ-phase stacking faults within it, along with fluctuations of chemical composition within these defects. Applied thermal exposure resulted in an increased amount of δ-, η-phases and formation of topologically close-packed phases. One of them was identified by electron diffraction as trigonal μ-phase. However, the difference in size and morphology revealed via tomographic reconstruction indicates that the formation of other topologically close-packed phases is possible. The μ-phase was enriched in Mo, Co, Fe and Cr, which causes their depletion in the γ-matrix and may detrimentally affect the superalloy mechanical properties. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The changes in ATI® 718Plus™ (718Plus) superalloy microstructure after high-temperature long-term exposure (850 °C/4000 h/air) were characterized by two- and three-dimensional imaging techniques. The 718Plus microstructure consists of a γ-matrix strengthened by coherent γ′-phase and plate-like η-phase at grain boundaries. The η-phase analysis showed the presence of δ-phase stacking faults within it, along with fluctuations of chemical composition within these defects. Applied thermal exposure resulted in an increased amount of δ-, η-phases and formation of topologically close-packed phases. One of them was identified by electron diffraction as trigonal μ-phase. However, the difference in size and morphology revealed via tomographic reconstruction indicates that the formation of other topologically close-packed phases is possible. The μ-phase was enriched in Mo, Co, Fe and Cr, which causes their depletion in the γ-matrix and may detrimentally affect the superalloy mechanical properties. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-019-04474-5