Kh. Kloos et al., CREEP-BEHAVIOR OF HEAT-RESISTANT STEELS . 1. CREEP EQUATIONS FOR INDIVIDUAL TEST MATERIALS, Materialwissenschaft und Werkstofftechnik, 24(8), 1993, pp. 287-295
For finite element calculations of high temperature components a conti
nuous description of the creep behaviour in the material's whole field
of application is required. For several long term tested heats of ste
els 2.25 Cr - 1 Mo, 1 Cr - 1 Mo - 0.5 Ni - 0.25 V and 12 Cr- 1 Mo - 0.
3 V creep equation were established.They contain the initial plastic s
train as well as the primary-. secondary- and tertiary-creep strain an
d are valid in the interesting range of temperature, stress and time f
or these steels. The test results are well interpreted by the correspo
ndent values calculated according to the creep equations. Additionally
. an equation of the recovery strain is proposed. Moreover, the creep
equations can be applied to incremental calculations with true strain
and true stress and in a certain extent, a transformation of the creep
equations to similar steels seems to be possible.