| Title |
Reliability Prediction of Long-term Creep Strength of Gr. 91 Steel for Next Generation Reactor Structure Materials |
| Authors |
김우곤(Woo Gon Kim); 박재영(Jae Young Park); 윤송남(Song Nan Yin); 김대환(Dae Whan Kim); 박지연(Ji Yeon Park); 김선진(Seon Jin Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2011.49.4.275 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
creep; creep strength; Z-parameter; Larson-Miller parameter; Gr.91 steel |
| Abstract |
This paper focuses on reliability prediction of long-term creep strength for Modified 9Cr-1Mo steel (Gr. 91) which is considered as one of the structural materials of next generation reactor systems. A “Z-parameter” method was introduced to describe the magnitude of standard deviation of creep rupture data to the master curve which can be plotted by log stress vs. The larson-Miller parameter (LMP). Statistical analysis showed that the scattering of the Z-parameter for the Gr. 91 steel well followed normal distribution. Using this normal distribution of the Z-parameter, the various reliability curves for creep strength design, such as stress-time temperature parameter reliability curves (σ-TTP-R curves), stress-rupture time-reliability curves (σ-tr-R curves), and allowable stress-temperature- reliability curves ([σ]-T-R curves) were reasonably drawn, and their results are discussed. |