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Microstructural modelling of the creep behaviour of particle‐strengthened superalloys
Author(s) -
Reppich Bernd,
Heilmaier Martin,
Liebig Karin,
Schumann Gerhard,
Stein KlausDieter,
Woller Thomas
Publication year - 1990
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199000343
Subject(s) - nimonic , creep , superalloy , materials science , metallurgy , hardening (computing) , particle (ecology) , stress (linguistics) , precipitation hardening , matrix (chemical analysis) , exponent , thermodynamics , composite material , microstructure , physics , geology , linguistics , oceanography , philosophy , layer (electronics)
The steady‐state creep of particle‐strengthened systems is predicted from the matrix behaviour within the framework of the threshold stress concept. A procedure is outlined for estimation of the hardening parameter σ p reflecting the effect of the particles. Unlike previous suggestions neither questionable nor restrictive simplifications are assumed for σ p and the stress exponent n m of the particle‐free matrix. The proposed approach is exemplified with γ’ precipitation‐strengthened Ni‐based superalloy Nimonic PE 16 crept at 810°C. The matrix creep data and, in particular, the needed n m ‐values are measured on single‐phase Nichrome reference alloys.