The paper is dealing with microstructural characterisation and mechanical properties of thermally simulated parts of the heat affected zone in homogeneous weldments of T24 steel. The study has been targeted on the blunt peripheral weld joints of T24 steel between two tubes, which are an integral part of the production of membrane walls. Investigations on thermally simulated HAZ samples were performed in two states: after simulation (as-welded) and after PWHT 740 °C / 1 h. Thermal cycles for simulation of basic parts of HAZ in homogeneous welds of T24 steel were obtained by real measurements with subsequent corrections based on numerical simulations of welding using the Sysweld software. Thermal simulations were carried out on samples of Vallourec & Mannesmann tubes using a simulator TCS 1405. On the thermally simulated samples hardness and impact energy were evaluated. Microstructural characterisation was carried out using both light microscopy and transmission electron microscopy. Extraction replicas were used for identification of minor phases. Results of thermal simulations were validated on a real weldment. Results on simulated samples reasonably complied with results obtained on the real homogeneous weldment of T24 steel.Keywords: weld joint, T24 steel, HAZ, thermal cycle, thermal simulation, precipitation
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