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

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

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandBegutachtung

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.

Originalspracheenglisch
TitelMATEC Web of Conferences
Herausgeber (Verlag)EDP Sciences
Seiten10002-10002
Band14
DOIs
PublikationsstatusVeröffentlicht - 2014
Veranstaltung2nd European Symposium on Superalloys and Their Applications, EUROSUPERALLOYS 2014 - Giens, Frankreich
Dauer: 12 Mai 201416 Mai 2014

Konferenz

Konferenz2nd European Symposium on Superalloys and Their Applications, EUROSUPERALLOYS 2014
Land/GebietFrankreich
OrtGiens
Zeitraum12/05/1416/05/14

ASJC Scopus subject areas

  • Chemie (insg.)
  • Ingenieurwesen (insg.)
  • Werkstoffwissenschaften (insg.)

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