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The effect of fine precipitate particles on the creep behaviour of ferritic model steels – II. Analysis of creep results
Author(s) -
Peterseim Jürgen,
Sauthoff Gerhard
Publication year - 1986
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198600715
Subject(s) - creep , materials science , metallurgy , stress (linguistics) , diffusion creep , dislocation , shear modulus , particle (ecology) , diffusion , composite material , thermodynamics , microstructure , grain boundary , physics , linguistics , philosophy , oceanography , geology
In view of efforts to develop ferritic creep resistant steels for applications above 600°C the effect of fine precipitate particles on the creep behaviour of ferritic model steels (20% Cr, up to 0.9 % Nb and 0.1 % C) was studied between 600 and 800°C as a function of stress, temperature and particle distribution. The analysis of the experimental results leads to the conclusion that the observed secondary creep rate can be described completely as dislocation creep by means of a modified power law: the temperature dependence is determined by that of the diffusion coefficient and of the shear modulus, the stress dependence is given by (σ‐σ th ) 3 where σ = applied stress and σ th = threshold stress, and the effect of the particles is described exclusively by the threshold stress which is of the order of the Orowan stress.