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The reasons of failure of a steam turbine blade made of Polish steel 23H12MNF (DIN X22Cr11MoV121), exploited 20.000 h at temperature 350 degrees centigrade were considered. Study on: chemical composition, mechanical properties, microstructure with the use of optical microscope, and scanning electron microscope (SEM) with microanalyser (EDS) have shown, that the reason of fatigue fracture were macro-...
Results of the examination of properties and microstructure of the CuNi16A15 and Cu(NiFe)16A15 based alloys with and addition of about 10% m/m Mn are presented. Advantageous characteristics of ageing of these alloys have been obtained, confirming the possibility of influencing their mechanical properties by control of the precipitation mechanism.
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