Abstract
This paper presents the results of tests conducted on the HR6W (23Cr-45Ni-6W-Nb-Ti-B) alloy under low-cycle fatigue at room temperature and at 650 °C. Fatigue tests were carried out at constant values of the total strain ranges. The alloy under low-cycle fatigue showed cyclic strengthening both at room temperature and at 650 °C. The degree of HR6W strengthening described by coefficient n’ was higher at higher temperatures. At the same time, its fatigue life Nf at room temperature was, depending on the range of total strain adopted in the tests, several times higher than observed at 650 °C.
Highlights
In Poland, electricity is mainly produced in conventional power plants, i.e., those in which the steam needed to drive the generators comes from coal-fired or lignite-fired boilers
The reduction in CO2 emissions can be achieved, among others, by increasing the operating parameters of supercritical boilers with constantly improved advanced materials which have better properties at elevated temperatures [1,2,3,4,5,6,7]. Such materials include the HR6W alloy, which is mainly used for superheater tubes in power boilers, thick-walled tubular elements, reactors, as well as in chemical plants
What is required from materials under high temperatures and pressures, which occur in boilers under increased operating parameters, is high creep resistance and thermalmechanical and low-cycle fatigue resistance as well as high corrosion resistance [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]
Summary
In Poland, electricity is mainly produced in conventional power plants, i.e., those in which the steam needed to drive the generators comes from coal-fired or lignite-fired boilers. The reduction in CO2 emissions can be achieved, among others, by increasing the operating parameters of supercritical boilers with constantly improved advanced materials which have better properties at elevated temperatures [1,2,3,4,5,6,7]. Such materials include the HR6W alloy, which is mainly used for superheater tubes in power boilers, thick-walled tubular elements, reactors, as well as in chemical plants.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call