Dynamic strain aging in SA508-class 3 pressure vessel steel

The influence of dynamic strain aging (DSA) on deformation and fracture was investigated on ASME SA508-class 3 pressure Vessel steel. Serrated flow in stress-strain curves was observed between about 140 and 340 degrees C, which was varied by the strain rate and microstructural condition. The onset temperature of serration for the pearlite-ferrite microstructural condition was lower than that for the as-received, tempered martensite condition. The serrated flow range for both the microstructural conditions shifted to higher temperatures with increased strain rates. On the other hand, J-R curves were obtained by the direct current potential drop (DCPD) technique at three different loading rates (0.08, 0.5 and 3.0 mm/min). The Ji value for the crack initiation fracture toughness and the crack growth resistance dJ/da by the DCPD method were decreased by about 30-40% at the reactor operating temperature region. These behaviours could be attributed to a DSA effect. When the loading rate was fast, the minimum fracture toughness region by DSA was shifted to higher temperatures.
Publisher
Elsevier Sci Ltd
Issue Date
1995
Language
ENG
Citation

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING, v.62, no.2, pp.123 - 129

ISSN
0308-0161
URI
http://hdl.handle.net/10203/73164
Appears in Collection
NE-Journal Papers(저널논문)
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