Mechanical behaviour of material of thermal power plant steam superheater collector after exploitation

The article deals with the comprehensive research of temperature influence upon fracture energy of operational 12Cr1MoV steel of steam superheater collector of TP-100 type boiler. The authors found out that heating from 20 °С to 200 °С results in an increase of Charpy toughness and eventual reaching of plateau. There were also spotted the main dependencies of changes of steel microhardness along the thickness of collector considering on the distance from the hole.