Vliv tepelného zpracování na vlastnosti svarových spojů modifikované 9% Cr oceli

Abstract

The introductory part of the thesis consists of a description and characterization of the mechanical properties of modified 9% Cr steel P91 and P92. It focuses on the changes of microstructure during tempering, the emergence of various minority phases and precipitation processes occurring during creep exposure. These processes are described in the individual model ranges heat affected zone of the weldment. Effects of heat treatment on mechanical properties are tested on four test pieces and testing of welded joints, which are based on assessed values, obtained graphically, compared and selected the most suitable welding temperature regime.