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.

► The influence of temperature on impact energy of collector was studied.
► With increasing of temperature from 20 °С to 200 °С the Charpy energy augments.
► Dependencies of steel microhardness along the collector thickness were revealed.
► The authors performed the microstructural analysis of the collector material.
► The histograms of carbides sizes on the grain boundaries were obtained.