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Creep equations for high temperature alloys on the basis of a parametric assessment of multi‐heat data
Author(s) -
Kloos Karl Heinz,
Granacher Joachim,
Pfenning Andreas
Publication year - 1996
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199605466
Subject(s) - creep , alloy , materials science , parametric statistics , finite element method , atmospheric temperature range , heat equation , thermodynamics , metallurgy , structural engineering , mathematics , engineering , mathematical analysis , physics , statistics
For the design of high temperature components creep equations are necessary. These describe the deformation behaviour of the material type used over its whole application range. The method of developing such an equation is demonstrated for the example of alloy G‐NiCo 15 Cr 10 Al 6 TiMo (Alloy 100). As a basic requirement, a multi‐heat assessment of time to specific strain is performed with the aid of a time temperature parameter procedure. In this way optimum correlated master curves are generated for the whole range of permanent strain and rupture. From these curves mean creep curves for the material type can be determined by minimal further smoothing. On the basis of these creep curves a modified Garofalo equation with initial plastic strain as well as primary, secondary and tertiary strain can be established to describe the creep behaviour of Alloy 100. Additionally, an equation for the time temperature dependent contraction of this alloy can be developed. These equations form a useful tool for the calculation of high temperature components with the finite element method.