Low-cycle fatigue behaviors of two heats of SA508 Gr.1a low alloy steel in 310°C air and deoxygenated water—Effects of dynamic strain aging and microstructures

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

“…As a consequence, in 310 ºC air, where the effect of DSA was large enough to override the microstructure effect, the LCF life of heat BA was similar to that of heat FP. On the other hand, the LCF life of heat BA was longer than that of heat FP in 310 ºC deoxygenated water, where the difference of DSA was not significant for both heats [7].…”

“…7 [7]. The LCF life of heat FP was shorter than that of heat BA in 310 ºC deoxygenated water while the LCF life of both heats was slightly shorter or comparable in 310 ºC air.…”

“…The LCF tests were conducted in a strain-controlled mode with a fully reversed triangle waveform. The fatigue specimen was a solid cylindrical type with a gauge section diameter of 9.63mm and a gauge length of 19.05mm [7]. During the LCF test, the strain in the gauge section was indirectly measured using a linear variable differential transformer (LVDT) attached at the shoulders of the specimens.…”

“…7 (a). The differences in microstructure could have affected the LCF life of two heats as described below [7]. Fig.…”

Coalesced Martensite in Pressure Vessel Steels

“…However, an examination of the literature shows that the structures have appeared in other publications but have not been recognised as such, even for pressure vessels steels [20][21][22][23]. Figure 4 shows the martensite obtained after austenitising at 1150 • C for 10 min, where abnormally large martensitic structures can be differentiated from an otherwise fine dispersion of martensite platelets.…”