Environmental Fatigue Behaviors of CF8M Stainless Steel in 310℃ Deoxygenated Water - Effects of Hydrogen and Microstructure

Environmental Fatigue of Metallic Materials in Nuclear Power Plants – A Review of Korean Test Programs

“…We carefully extracted the LCF data of cast stainless steels produced in RT air and 310 ºC deoxygenated water and re-plotted the Fen value of cast SSs. The Fen value was smaller than [20] that of wrought SSs in simulated PWR environment, which is similar to our test data [22]. Fig.…”

“…Therefore, like SA508 Gr. 1a [8] and 316LN [19,20], the LCF life of CF8M was mainly affected by the environmental factor during LCF processes in 310 ºC deoxygenated water [22].…”

“…Because it is well known that the micro-structurally small crack is significantly affected by a barrier role of relatively high hardness phases [1], similar effects could be operated in fatigue crack growth process with multiple cracking. Therefore, the fatigue crack growth would be retarded by a barrier role of ferrite phase in CF8M, especially in 310 ºC deoxygenated water although the HIC mechanism is still operated in the LCF process at the same time [22]. …”