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Influence of Dynamic Strain Ageing and Long Term Ageing on Deformation and Fracture Behaviors of Alloy 617
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Sandvik Materials Technology, Strategy research, Sandviken, Sweden.
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.
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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2016 (English)In: THERMEC 2016 / [ed] C. Sommitsch, M. Ionescu, B. Mishra, E. Kozeschnik and T. Chandra, Trans Tech Publications, 2016, Vol. 879, 306-311 p.Conference paper, Published paper (Refereed)
Abstract [en]

Influences of dynamic strain ageing and long term ageing on deformation, damage and fracture behaviors of Alloy 617 material have been studied. Dynamic strain ageing can occur in this alloy at temperature from 400 to 700°C, which leads to a strain hardening and also an increase in fracture strain due to plastic deformation caused by twinning. Long term ageing at 700°C for up to 20 000 hours can cause different precipitation such as γ ́, M6C (Mo-rich) and M23C6 (Cr-rich) carbides. These carbides are both inter-and intra-granular particles. The long term ageing reduces the fracture toughness of the material, but the alloy can still have rather high impact toughness and fracture toughness even with an ageing at 700°C for 20 000 hour. The mechanisms have been studied using electron backscatter detection and electron channeling contrast imaging. It shows that besides dislocation slip, twinning is another main deformation mechanism in these aged Alloy 617 materials. At the crack front, plenty of micro or nanotwins can be observed. The formation of these twins leads to a high ductility and toughness which is a new observation or a new concept for this type of material.

Place, publisher, year, edition, pages
Trans Tech Publications, 2016. Vol. 879, 306-311 p.
Series
Materials Science Forum, ISSN 1662-9752 ; 879
Keyword [en]
Nickel based superalloy, Ageing, Fracture toughness, Microstructure, Twinning
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-129243DOI: 10.4028/www.scientific.net/MSF.879.306OAI: oai:DiVA.org:liu-129243DiVA: diva2:936713
Conference
THERMEC'16, Graz, Austria, May 29-June 3, 2016
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-11-30Bibliographically approved

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