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Small-scale tension specimens taken transversely from similar weldments of 12% Cr steel as well as small- and large-scale specimens from dissimilar weldments of 12% Cr/1% CrMoV with 12% Cr deposit were tested to obtain creep rupture data at 550°C. For the similar weld, the rupture time of the specimens was considerably longer than the rupture time determined in uniaxial creep tests of the weakest heat-affected zone (HAZ) microstructure. Results of finite element analyses have shown that this is caused by a constraint imposed on the weakest HAZ by the surrounding microstructures with higher creep strength. For the dissimilar weld, the creep rupture strength of large-scale specimens is higher than that of small-scale specimens. Finite element analyses have shown differences in the stress states developing in small- and large-scale specimens, which lead to different rupture times.
creep, weldments, finite element analysis, HAZ properties, Type IV cracking
Director, Staatliche Materialprüfungsanstalt (MPA), Stuttgart 80,
Head of department, Staatliche Materialprüfungsanstalt (MPA), Stuttgart 80,
Research engineer, Staatliche Materialprüfungsanstalt (MPA), Stuttgart 80,