Kh. Kloos et al., CREEP EQUATIONS FOR HIGH-TEMPERATURE ALLOYS ON THE BASIS OF A PARAMETRIC ASSESSMENT OF MULTI-HEAT DATA, Steel research, 67(3), 1996, pp. 106-110
For the design of high temperature components creep equations are nece
ssary. These describe the deformation behaviour of the material type u
sed 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 temperatu
re parameter procedure. In this way optimum correlated master curves a
re generated for the whole range of permanent strain and rupture. From
these curves mean creep curves for the material type can be determine
d by minimal further smoothing. On the basis of these creep curves a m
odified Garofalo equation with initial plastic strain as well as prima
ry, secondary and tertiary strain can be established to describe the c
reep behaviour of Alloy 100. Additionally, an equation for the time te
mperature dependent contraction of this alloy can be developed. These
equations form a useful tool for the calculation of high temperature c
omponents with the finite element method.