Gauge-Strain-Controlled Air and PWR Fatigue Life Data for 304 Stainless Steel — Some Eects of Surface Finish and Hold Time

TY - JOUR

T1 - Gauge-Strain-Controlled Air and PWR Fatigue Life Data for 304 Stainless Steel — Some Eects of Surface Finish and Hold Time

AU - Vankeerberghen, Marc

AU - De Smet, Michel

AU - Malekian, Christian

N1 - Score=10

PY - 2020/9/16

Y1 - 2020/9/16

N2 - We performed environmental fatigue testing in simulated primary water reactor (PWR) primary water and reference fatigue testing in air in the framework of an international, collaborative project (INCEFA-PLUS), where the eects of mean strain and stress, hold time, strain amplitude and surface finish on fatigue life of austenitic stainless steels in light water reactor environments are being studied. Our fatigue lives obtained on machined specimens in air at 300 C lie close to the NUREG/CR6909 mean air fatigue curve and are in line with INCEFA-PLUS air fatigue lives. Our environmental fatigue lives obtained in simulated PWR primary water at 300 C lie relatively close to the NUREG/CR6909 mean fatigue curve; derived from the NUREG/CR6909 mean air fatigue curve and the applicable environmental correction factor (Fen). The PWR results show that (1) a polished surface finish has a slightly higher and a ground surface finish a slightly lower fatigue life than the NUREG/CR6909 prediction; (2) the ratio of polished to ground specimen life is ~1.37 at 300 C and ~1.47 at 230 C; (3) holds—at zero strain after a positive strain-rate—have a slightly detrimental eect on fatigue life. These results are in line with the INCEFA-PLUS PWR fatigue lives. A novel gauge-strain extensometer was deployed in order to perform a true gauge-strain-controlled fatigue test in simulated PWR primary water.

AB - We performed environmental fatigue testing in simulated primary water reactor (PWR) primary water and reference fatigue testing in air in the framework of an international, collaborative project (INCEFA-PLUS), where the eects of mean strain and stress, hold time, strain amplitude and surface finish on fatigue life of austenitic stainless steels in light water reactor environments are being studied. Our fatigue lives obtained on machined specimens in air at 300 C lie close to the NUREG/CR6909 mean air fatigue curve and are in line with INCEFA-PLUS air fatigue lives. Our environmental fatigue lives obtained in simulated PWR primary water at 300 C lie relatively close to the NUREG/CR6909 mean fatigue curve; derived from the NUREG/CR6909 mean air fatigue curve and the applicable environmental correction factor (Fen). The PWR results show that (1) a polished surface finish has a slightly higher and a ground surface finish a slightly lower fatigue life than the NUREG/CR6909 prediction; (2) the ratio of polished to ground specimen life is ~1.37 at 300 C and ~1.47 at 230 C; (3) holds—at zero strain after a positive strain-rate—have a slightly detrimental eect on fatigue life. These results are in line with the INCEFA-PLUS PWR fatigue lives. A novel gauge-strain extensometer was deployed in order to perform a true gauge-strain-controlled fatigue test in simulated PWR primary water.

KW - environmental fatigue

KW - 304 stainless steel

KW - air

KW - PWR primary water

KW - 300°C

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/overview/40248185

U2 - 10.3390/met10091248

DO - 10.3390/met10091248

M3 - Article

VL - 2020-10

SP - 1

EP - 15

JO - Metals

JF - Metals

SN - 2075-4701

IS - 1248

M1 - 10-01248

ER -