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A new creep equation for ferritic and martensitic steels
Author(s) -
Bartsch Herbert
Publication year - 1995
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199501142
Subject(s) - creep , materials science , stress (linguistics) , rod , metallurgy , structural engineering , thermodynamics , mathematics , mechanics , physics , engineering , medicine , linguistics , philosophy , alternative medicine , pathology
Creep rupture tests lasting 100 000 h at temperatures between 500 and 650°C were conducted on X22CrMoV12‐1 rods. An equation has been derived from the measured creep data for the primary and the beginning of the secondary creep range of the following formA new element in the equation is the description for the dependency on stress f (σ) which was obtained from the stress dependency in the Norton equationThe new equation allows the description of the creep behaviour up to a strain of 0.5 %. Using the equation, the corresponding stress can be calculated to an accuracy of ±10 % from the strain limits determined in relation to time during creep rupture tests (above 0.1 % strain).