Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests

Lukas Haußmann, Steffen Neumeier, Markus Kolb, Johannes Ast, Gaurav Mohanty, Johann Michler, Mathias Göken

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Chemical inhomogenities due to dendritic solidification of Ni-based superalloys result in different local microstructures with varying mechanical properties. New indentation creep test methods allow probing of the local creep properties at the dendrite scale at high temperatures. The as-cast single crystalline Ni-based superalloy ERBO1A (a derivative alloy of CMSX–4) was investigated and electron-probe microanalysis (EPMA) measurements revealed strong segregation of, e.g., Re and W in the dendritic region and, e.g., Ta in the interdendritic region. Indentation creep experiments at 750 °C and micropillar compression tests at 785 °C were conducted in both regions, and a higher creep strength was found in the dendritic region compared to the interdendritic region. Theoretical models for solid solution hardening as well as γ′ precipitation hardening confirm these results, since they predict a higher strength in the dendritic region than in the interdendritic region. Compared with the fully heat treated state, a smaller difference in the local mechanical properties or even a reverse strength ratio of the dendritic and interdendritic region can be expected.

Original languageEnglish
Title of host publicationSuperalloys 2020
Subtitle of host publicationProceedings of the 14th International Symposium on Superalloys
EditorsSammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki
PublisherSpringer
Pages273-281
Number of pages9
ISBN (Electronic)978-3-030-51834-9
ISBN (Print)9783030518332
DOIs
Publication statusPublished - 2020
Publication typeA4 Article in a conference publication
EventInternational Symposium on Superalloys - Seven Springs, United States
Duration: 12 Sep 202116 Sep 2021

Publication series

NameThe Minerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceInternational Symposium on Superalloys
Country/TerritoryUnited States
CitySeven Springs
Period12/09/2116/09/21

Keywords

  • Dendritic segregations
  • Indentation creep
  • Micropillar compression
  • Ni-based superalloy

Publication forum classification

  • Publication forum level 0

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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