The evaluation of suitability for operation of repair low-alloy steel welded joints
Journal Title: Archives of Materials Science and Engineering - Year 2016, Vol 78, Issue 2
Abstract
Purpose: The purpose of the work was to evaluate the material condition of repair weldedjoints of steam pipelines with regard to their suitability for operation including determinationof the time of their further safe operation.Design/methodology/approach: The following was carried out: microstructureinvestigations using scanning electron microscopy, investigations on mechanical propertiesat room and elevated temperatures, determination of the fracture appearance transitiontemperature based on impact tests. The abridged creep tests without measurement ofelongation during test were carried out to determine the material’s residual life.Findings: The time of safe operation was determined for welded joints made in 14MoV63steel after long-term service and 14MoV63 steel after long-term service and in theas-received condition.Practical implications: The applied methodology and the adopted procedures are usedin evaluating the condition and forecasting further operation of new repair welded joints forthe pressure part components of power equipment working under creep conditions.Originality/value: The obtained results of investigations will be the elements of materialscharacteristics worked out by the Institute for Ferrous Metallurgy for the steels and weldedjoints made in them to work under creep conditions.
Authors and Affiliations
M. Dziuba-Kałuża, A. Zieliński, J. Dobrzański, T. Linek
Keywords
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