Kim, Myung-Yeon Chu, Dong-Ju Lee, Young-Kook Shim, Jae-Hyeok Jung, Woo-Sang 2024-01-19T19:32:38Z 2024-01-19T19:32:38Z 2021-09-02 2019-08 0951-8320 https://pubs.kist.re.kr/handle/201004/119739 Non-destructive testing (NDT) is the process of evaluating and inspecting materials without damage. The purpose of present study is to evaluate the residual lifetime of materials by proposing a new concept of nondestructive testing. The residual lifetime of service-exposed 1.25Cr-0.5Mo (P11) steel cold-reheater pipes in a coal-fired power plant, which were used for approximately 23 years at 310 degrees C, was investigated with accelerated degradation tests of a fresh P11 steel. The hardness and the microstructure of the P11 steel aged at 550 degrees C for 1000 h were similar to those of the service-exposed cold-reheater pipe. The creep-rupture tests of the steel aged at 550 degrees C for 1000 h were performed under various temperature and stress conditions together with the fresh steel. The creep-rupture properties analyzed using a Larson Miller parameter (LMP) approach suggested that the residual lifetime of the service-exposed pipes is approximately 53% at the current conditions. The proposed methodology is expected to serve as a useful tool to check the timing of materials replacement and to maintain safety in a coal-fired power plant. English ELSEVIER SCI LTD CREEP-BEHAVIOR STEEL MICROSTRUCTURE STRESS Residual lifetime assessment of cold-reheater pipe in coal-fired power plant through accelerated degradation test Article 10.1016/j.ress.2019.03.043 1 RELIABILITY ENGINEERING & SYSTEM SAFETY, v.188, pp.330 - 335 RELIABILITY ENGINEERING & SYSTEM SAFETY 188 330 335 scie scopus 000470341400029 2-s2.0-85063403269 Engineering, Industrial Operations Research & Management Science Engineering Operations Research & Management Science Article CREEP-BEHAVIOR STEEL MICROSTRUCTURE STRESS 1.25Cr-0.5Mo steel Cold-reheater pipe Creep LMP Residual lifetime