TY - GEN
T1 - Oxidation and SCC initiation studies of type 304L SS in PWR primary water
AU - Scenini, F.
AU - Lindsay, J.
AU - Chang, Litao
AU - Wang, Y. L.
AU - Burke, M. G.
AU - Lozano-Perez, S.
AU - Pimentel, G.
AU - Tice, D.
AU - Mottershead, K.
AU - Addepalli, V.
N1 - Publisher Copyright:
© 2019, The Minerals, Metals & Materials Society.
PY - 2019
Y1 - 2019
N2 - Slow strain rate tensile (SSRT) tests were conducted on conventional and tapered samples manufactured from forged Type 304L stainless steel to assess the stress corrosion cracking (SCC) behaviour in simulated PWR primary water. Several testing and microstructural parameters were investigated in order to explore the conditions under which crack initiation might occur. Surface preparation appeared to play a very important role on SCC initiation whereby the machined surfaces were the least susceptible to SCC initiation whilst oxide polishing suspension (OPS) polished surfaces were more susceptible. On the machined surfaces the cracks were always transgranular (TG) in nature and associated with the machining marks. Conversely, on fine polished surfaces with oxide polishing suspension the crack morphology was mainly intergranular in nature, although minor transgranular cracking was observed. The regions in the proximity of the δ-ferrite/austenite interface were shown to be very susceptible to SCC initiation especially on the OPS polished surfaces and this was attributed to the strain localization upon dynamic deformation. Furthermore, intragranular inclusions appeared to dissolve and act as initiation sites for transgranular cracking to occur. The roles of strain rate, dynamic deformation and microstructure on the initiation of SCC are also discussed.
AB - Slow strain rate tensile (SSRT) tests were conducted on conventional and tapered samples manufactured from forged Type 304L stainless steel to assess the stress corrosion cracking (SCC) behaviour in simulated PWR primary water. Several testing and microstructural parameters were investigated in order to explore the conditions under which crack initiation might occur. Surface preparation appeared to play a very important role on SCC initiation whereby the machined surfaces were the least susceptible to SCC initiation whilst oxide polishing suspension (OPS) polished surfaces were more susceptible. On the machined surfaces the cracks were always transgranular (TG) in nature and associated with the machining marks. Conversely, on fine polished surfaces with oxide polishing suspension the crack morphology was mainly intergranular in nature, although minor transgranular cracking was observed. The regions in the proximity of the δ-ferrite/austenite interface were shown to be very susceptible to SCC initiation especially on the OPS polished surfaces and this was attributed to the strain localization upon dynamic deformation. Furthermore, intragranular inclusions appeared to dissolve and act as initiation sites for transgranular cracking to occur. The roles of strain rate, dynamic deformation and microstructure on the initiation of SCC are also discussed.
KW - 304L stainless steel
KW - Oxidation
KW - Slow strain rate test (SSRT)
KW - Stress corrosion cracking (SCC) initiation
UR - http://www.scopus.com/inward/record.url?scp=85064066688&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-04639-2_51
DO - 10.1007/978-3-030-04639-2_51
M3 - Conference contribution
AN - SCOPUS:85064066688
SN - 9783030046385
SN - 9783030046392
SN - 9783319515403
SN - 9783319651354
SN - 9783319728520
SN - 9783319950211
T3 - Minerals, Metals and Materials Series
SP - 793
EP - 810
BT - Minerals, Metals and Materials Series
PB - Springer International Publishing
T2 - 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019
Y2 - 18 August 2019 through 22 August 2019
ER -