High temperature creep is often dealt with simplified models to assess and pre-dict the future behavior of materials and components. Also, for most applications the creep properties of interest require costly long-term testing that limits the available data to support design and life assessment. Such test data sets are even smaller for welded joints that are often the weakest links of structures. It is of considerable interest to be able to reliably predict and extrapolate long term creep behavior from relatively small sets of supporting creep data. For creep strain, the current tools for model verification and quality assurance are very limited. The ECCC PATs can be adapted to some degree but the uncer-tainty and applicability of many models are still questionable outside the range of data. In this thesis tools for improving the model robustness have been devel-oped. The toolkit includes creep rupture, weld strength and creep strain model-ing improvements for uniaxial prediction. The applicability is shown on data set consisting of a selection of common high temperature steels and the oxygen-free phosphorous doped (OFP) copper. The steels assessed are 10CrMo9-10 (P22), 7CrWVMoNb9-6 (P23), 7CrMoVTiB10-10 (P24), 14MoV6-3 (0.5CMV), X20CrMoV11-1 (X20), X10CrMoVNb9-1 (P91) and X11CrMoWVNb9-1-1 (E911).
|Award date||5 Feb 2010|
|Place of Publication||Espoo|
|Publication status||Published - 2010|
|MoE publication type||G5 Doctoral dissertation (article)|
- OFP copper