MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A SIMILAR T24 STEEL WELDED JOINT AFTER SERVICE
Journal Title: Prace Instytutu Metalurgii Żelaza - Year 2018, Vol 70, Issue 2
Abstract
The material under investigation was a welded joint made of 7CrMoVTiB10-10 (T24) steel after 36,000 hours of use at the temperature of 540°C and pressure of 27 MPa. The test samples for the study were taken from a membrane wall of a USC steam boiler. The research scope included: analysis of chemical composition of the original and the additional material (weld pass), investigation of the microstructure using optical microscopy and scanning electron microscopy, as well as tests of mechanical properties of the joint – hardness measurement. It was proved that the investigated joint was characterised by a regular structure, without any welding defects, which probably resulted from the application of the additional material based on the CrMo steel from the weld root side. The observation showed that the microstructure of the original material consisted of granular bainite with numerous precipitates. In the heat affected zone and in the weld, the microstructure of lath bainite (bainitic-martensitic microstructure) was observed, also with numerous precipitates. The hardness of the analysed joint was lower than the limiting value of 350HV.
Authors and Affiliations
Agata Merda, Grzegorz Golański, Paweł Urbańczyk, Kaludia Klimaszewska
Keywords
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- DOI 10.32730/imz.0137-9941.18.2.04
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