Slow strain rate testing of a cyclically stabilized A 516 Gr. 70 piping steel in PWR conditions

Technical Report · Wed Nov 01 04:00:00 EST 1989

DOI:https://doi.org/10.2172/5498424· OSTI ID:5498424

Hanninen, H. E.; Cullen, W. H. ^[1]

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1. Valtion Teknillinen Tutkimuskeskus, Espoo (Finland). Metals Lab.

In fatigue, both monotonic and cyclic plastic zones are formed ahead of the crack tip, inside which the strain history can be studied on the basis of stable hysteresis loops and their development. A 516 Gr. 70 piping steel was prefatigued to represent the material structure anticipated in the process zone and in the area of the maximum tensile stress ahead of the crack-tip. With these materials, slow strain rate tests were performed both in bulk PWR-environments and in the simulated crack-tip environments (MnS-contaminated water). Environment-sensitive cracking occurred in the simulated crack tip environments and in tests where external polarization was used to polarize the specimens to 0.0 mV(SHE) in both the MnS-contaminated and pure PWR-water. No marked difference was observed between as-received material and prefatigued materials. Usually the residual hydrogen content of the gage length section was increased after SSRT-testing, but based on the limited number of tests no clear conclusions could be drawn. 39 refs., 18 figs., 6 tabs.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Engineering; Materials Engineering Associates, Inc., Lanham, MD (USA)
• Sponsoring Organization: NRC
• OSTI ID: 5498424
• Report Number(s): NUREG/CR-5327; MEA--2265; ON: TI90002601
• Country of Publication: United States
• Language: English

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