Abstract
15CrMoG steel is a type of heat-resistant steel frequently used in boiler and piping systems. Creep properties of the 15CrMoG steel at service temperatures are not much documented due to the difficulties in obtaining long-term creep data. Herein, the creep behavior and the cavity evolution of 15CrMoG steel were investigated based on 20,000 h of creep tests at varied temperatures. Creep curves were analyzed to elucidate the creep behavior and creep rupture mechanism of the 15CrMoG steel. A continuum damage model was adopted to fit the rupture stress versus creep time data, and the results showed the reliability of this model in describing the creep behavior and predicting the creep life. The creep rupture stress at 20,000 h decreased significantly with the increase in the temperature in the tested temperature range. The cavitation in the 15CrMoG steel samples occurring during the creep tests was also examined by microscopic analysis, the results of which confirmed that the cavitation evolution is responsible for the reduced mechanical performance and finally creep rupture of the steel. This work provides valuable high-temperature creep data of the 15CrMoG heat-resistant steel and insights into evaluation and prediction of long-term creep behavior at high temperatures.
Highlights
High-chromium steels are frequently used as the materials for high-temperature boilers in power plants designed for ultra-supercritical steam parameters.[1,2]
The 15CrMoG steel is a type of pearlitic steel with high creep resistance and long creep rupture lives at the temperature of ;500°C that are expected for boilers in power plants.[3,4]
It was found that the continuum damage model (CDM) model prediction curves agreed well with the experimental data at all the temperatures, demonstrating the reliability of the CDM model for predicting the long-term creep behavior and creep life of 15CrMoG steel
Summary
High-chromium steels are frequently used as the materials for high-temperature boilers in power plants designed for ultra-supercritical steam parameters.[1,2] Among these, the 15CrMoG steel is a type of pearlitic steel with high creep resistance and long creep rupture lives at the temperature of ;500°C that are expected for boilers in power plants.[3,4] Creep is usually responsible for the deformation of steels operating at high temperatures.[5]. Keywords 15CrMoG steel, high-temperature creep, creep tests, cavity evolution Hightemperature creep tests were conducted for 15CrMoG steel samples under different conditions over a long period of up to 20,000 h.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
