Thermomechanical behavior of different Ni-base superalloys during cyclic loading at elevated temperatures

Daniel Huber*, Matthias Hacksteiner, Maria Cecilia Poletti, Fernando Warchomicka, Martin Stockinger

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The material behavior of three Ni-base superalloys (Inconel® 718, Allvac® 718PlusTM and Haynes® 282®) during in-phase cyclic mechanical and thermal loading was investigated. Stress controlled thermo-mechanical tests were carried out at temperatures above 700 °C and different levels of maximum compressive stress using a Gleeble® 3800 testing system. Microstructure investigations via light optical microscopy (LOM) and field emission gun scanning electron microscopy (FEG-SEM) as well as numerical precipitation kinetics simulations were performed to interpret the obtained results. For all alloys, the predominant deformation mechanism during deformation up to low plastic strains was identified as dislocation creep. The main softening mechanism causing progressive increase of plastic strain after preceding linear behavior is suggested to be recrystallization facilitated by coarsening of grain boundary precipitates. Furthermore, coarsening and partial transformation of strengthening phases was observed. At all stress levels, Haynes® 282® showed best performance which is attributable to its stable microstructure containing a high phase fraction of small, intermetallic precipitates inside grains and different carbides evenly distributed along grain boundaries.

Original languageEnglish
Title of host publicationMATEC Web of Conferences
PublisherEDP Sciences
Pages10002-10002
Volume14
DOIs
Publication statusPublished - 2014
Event2nd European Symposium on Superalloys and Their Applications, EUROSUPERALLOYS 2014 - Giens, France
Duration: 12 May 201416 May 2014

Conference

Conference2nd European Symposium on Superalloys and Their Applications, EUROSUPERALLOYS 2014
CountryFrance
CityGiens
Period12/05/1416/05/14

ASJC Scopus subject areas

  • Chemistry(all)
  • Engineering(all)
  • Materials Science(all)

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