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  • Chen, ZheLinköpings universitet,Linköping University,Konstruktionsmaterial,Tekniska fakulteten (author)

Nano-scale characterization of white layer in broached Inconel 718

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • Amsterdam :Elsevier BV,2017
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:6a7bb659-db8c-483a-a13e-ab666694be13
  • https://doi.org/10.1016/j.msea.2016.12.045DOI
  • https://research.chalmers.se/publication/246537URI
  • https://lup.lub.lu.se/record/834c6791-9b16-4a8e-bc11-83150dc4d372URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-134123URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Funding agencies: AForsk Foundation [15-334];  [2009-00971]
  • The formation mechanism of white layers during broaching and their mechanical properties are not well investigated and understood to date. In the present study, multiple advanced characterization techniques with nano-scale resolution, including transmission electron microscopy (TEM), transmission Kikuchi diffraction (TKD), atom probe tomography (APT) as well as nano-indentation, have been used to systematically examine the microstructural evolution and corresponding mechanical properties of a surface white layer formed when broaching the nickel-based superalloy Inconel 718.TEM observations showed that the broached white layer consists of nano-sized grains, mostly in the range of 20–50 nm. The crystallographic texture detected by TKD further revealed that the refined microstructure is primarily caused by strong shear deformation. Co-located Al-rich and Nb-rich fine clusters have been identified by APT, which are most likely to be γ′ and γ′′ clusters in a form of co-precipitates, where the clusters showed elongated and aligned appearance associated with the severe shearing history. The microstructural characteristics and crystallography of the broached white layer suggest that it was essentially formed by adiabatic shear localization in which the dominant metallurgical process is rotational dynamic recrystallization based on mechanically-driven subgrain rotations. The grain refinement within the white layer led to an increase of the surface nano-hardness by 14% and a reduction in elastic modulus by nearly 10% compared to that of the bulk material. This is primarily due to the greatly increased volume fraction of grain boundaries, when the grain size was reduced down to the nanoscale.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Hörnqvist Colliander, Magnus,1979Chalmers University of Technology,Department of Physics, Chalmers University of Technology, Gothenburg, Sweden(Swepub:cth)magnuh (author)
  • Sundell, Gustav,1985Chalmers University of Technology,Department of Physics, Chalmers University of Technology, Gothenburg, Sweden(Swepub:cth)gussund (author)
  • Peng, RuLinköpings universitet,Linköping University,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)rupe37 (author)
  • Zhou, JinmingLund University,Lunds universitet,Industriell Produktion,Institutionen för maskinvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Production and Materials Engineering,Department of Mechanical Engineering Sciences,Departments at LTH,Faculty of Engineering, LTH,Division of Production and Materials Engineering, Lund University, Sweden(Swepub:lu)mtov-jzh (author)
  • Johansson, StenLinköpings universitet,Linköping University,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)stejo02 (author)
  • Moverare, JohanLinköpings universitet,Linköping University,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)johmo31 (author)
  • Linköping UniversityKonstruktionsmaterial (creator_code:org_t)

Related titles

  • In:Materials Science & Engineering A: Structural Materials: Properties, Microstructure and ProcessingAmsterdam : Elsevier BV684, s. 373-3840921-50931873-4936

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