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Influence of Cold Rotary Swaging on Microstructure and Uniaxial Mechanical Behavior in Alloy 718

Klumpp, Alexander 1; Kauffmann, Alexander 1; Seils, Sascha 1; Dietrich, Stefan ORCID iD icon 1; Schulze, Volker 1
1 Karlsruher Institut für Technologie (KIT)

Abstract:

In this study, the influence of cold rotary swaging on microstructure and mechanical properties of the precipitation-strengthened nickel-based superalloy 718 (Alloy 718) was investigated. The initial stages of work-hardening were characterized by means of microhardness, electron backscatter diffraction (EBSD), and X-ray diffraction (XRD) analyses. Furthermore, attention was devoted to the mechanical behavior at ambient and elevated temperature (550 °C) in uniaxial tension and compression. Rotary swaging to different true strains of maximum φ=0.91 caused a moderate increase of microhardness and enhanced markedly the load-bearing capacity in tension, giving rise to yield strength beyond 2000 MPa. The mechanical strength R$_{ p0.2}$ in tension subsequent to rotary swaging perfectly correlates with increasing dislocation density ρ estimated from XRD in the form of a Taylor-like relationship R$_{ p0.2}$ ∝ $\sqrt{p}$. In compression, transient stress–strain evolution without the occurrence of a clear elastic range and distinct yield phenomenon was observed. Restoration of the elastic range, accompanied by a pronounced increase of microhardness, was obtained by a post-swaging tempering treatment at 600 °C.


Verlagsausgabe §
DOI: 10.5445/IR/1000136038
Veröffentlicht am 02.08.2021
Originalveröffentlichung
DOI: 10.1007/s11661-021-06371-w
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1073-5623, 1543-1940
KITopen-ID: 1000136038
HGF-Programm 38.04.01 (POF IV, LK 01) Gas turbines
Erschienen in Metallurgical and materials transactions / A
Verlag Springer
Band 52
Seiten 4331–4341
Vorab online veröffentlicht am 28.07.2021
Nachgewiesen in Dimensions
Web of Science
Scopus
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