Abstract
The results of a series of creep tests on the materials of CrMoV weldments, in main steam pipes, are presented in this paper. The tests were performed at 640°C, using uniaxial, notched, impression and cross-weld creep test specimens. The materials involved include service-aged and ‘as-new’ 1/2Cr1/2Mo1/4V parent materials, service-aged and new 2 1/4Cr1Mo weld metals and the HAZ materials in the new, service-aged and fully repaired welds. Based on the test data obtained, material constants in creep continuum damage constitutive equations for the parent, weld and HAZ materials were determined. Direct comparison of the test data allows the creep deformation and rupture behaviour of the parent, weld and HAZ materials to be identified. The material properties of these CrMoV weldment materials can be used in numerical FE modelling to contribute to the understanding of the performance of the new, service-aged and repaired welds in similar materials.
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