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

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Abstract

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.

Details

Original languageEnglish
Article number10-01248
Pages (from-to)1-15
Number of pages15
JournalMetals
Volume2020-10
Issue number1248
DOIs
Publication statusPublished - 16 Sep 2020

Keywords

  • environmental fatigue, 304 stainless steel, air, PWR primary water, 300°C

ID: 6910411