000203284 001__ 203284
000203284 005__ 20181203023703.0
000203284 0247_ $$2doi$$a10.1016/j.actamat.2012.06.028
000203284 022__ $$a13596454
000203284 037__ $$aARTICLE
000203284 245__ $$aEvolution of microstructure and twin density during thermomechanical processing in a γ-γ' nickel-based superalloy
000203284 260__ $$c2012
000203284 269__ $$a2012
000203284 336__ $$aJournal Articles
000203284 520__ $$aMicrostructure evolution has been studied in the nickel-based superalloy PER®72 subjected to hot torsion, to annealing below the primary γ' solvus temperature and to annealing at a supersolvus temperature, with a special emphasis on grain size and twin content. Dynamic abnormal grain growth occurs before the onset of dynamic recrystallization. The resulting bimodal grain size distribution affects the grain-coarsening kinetics at the supersolvus temperature, so that the final microstructures depend on the former straining stages. As a consequence, the twin content does not follow a univocal relationship with the average grain size. The grain boundary velocity history before reaching the final grain size is a contributing factor, and this is notably related to the initial grain size distribution width. Dynamically recrystallized microstructures are by nature more homogeneous and thus give rise to lower rates in supersolvus grain coarsening, and accordingly lead to relatively lower twin densities. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
000203284 6531_ $$aAbnormal grain growth
000203284 6531_ $$aAverage grain size
000203284 6531_ $$aBimodal grain-size distribution
000203284 6531_ $$aBoundary velocity
000203284 6531_ $$aContributing factor
000203284 6531_ $$aDynamic recrystallization
000203284 6531_ $$aGrain boundaries
000203284 6531_ $$aGrain boundary engineering
000203284 6531_ $$aGrain coarsening
000203284 6531_ $$aGrain growth
000203284 6531_ $$aGrain size
000203284 6531_ $$aGrain size and shape
000203284 6531_ $$aHot torsion
000203284 6531_ $$aInitial grain size
000203284 6531_ $$aMicrostructural evolution
000203284 6531_ $$aMicrostructure
000203284 6531_ $$aMicrostructure evolutions
000203284 6531_ $$aNi-based superalloys
000203284 6531_ $$aNickel- based superalloys
000203284 6531_ $$aPlastic flow
000203284 6531_ $$aRecrystallized microstructures
000203284 6531_ $$aSolvus temperature
000203284 6531_ $$aSuperalloys
000203284 6531_ $$aSupersolvus temperatures
000203284 6531_ $$aThermo-mechanical processing
000203284 6531_ $$aThermomechanical processing
000203284 6531_ $$aTwin boundaries
000203284 6531_ $$aTwin boundary
000203284 700__ $$aBozzolo, N.
000203284 700__ $$aSouaï, N.
000203284 700__ $$0248074$$g243441$$aLogé, R.E.
000203284 773__ $$j60$$tActa Materialia$$q5056-5066
000203284 909C0 $$xU12903$$0252516$$pLMTM
000203284 909CO $$pSTI$$particle$$ooai:infoscience.tind.io:203284
000203284 937__ $$aEPFL-ARTICLE-203284
000203284 973__ $$rREVIEWED$$sPUBLISHED$$aOTHER
000203284 980__ $$aARTICLE