Abstract
Increasing share of renewable energy sources in the electricity production results in a pressure on the thermal power plants to cover the power fluctuation very frequently. The increasing number of the start-ups and shutdowns as well as requirements for prompt ramping and for higher operation temperature has cardinal influence on the lifetime of the steam turbine. This all brings new challenges in to the designing process of the new steam turbines and lifetime analysis of currently operated ones. This paper aims to present experimental work, basic material parameters such as tensile test properties and FATT are determined here. Additionally, advanced material properties are probed by fracture toughness tests, fatigue crack growth tests and stress intensity factor threshold tests under various temperature ranges and cycle asymmetries R. The study is carried out for several steels used for the turbine shafts design.
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