Abstract
Uniaxial creep of the 316L austenitic steel is studied in static oxygen-controlled lead-bismuth eutectic (LBE) with an oxygen content of 10−6 wt. % decreasing to 10−11 wt. % and in air at 450–550 °C. Dissolution of the steel components (nickel, iron and chromium) in liquid metal with a following formation of a depletion zone and ingress of liquid metal inwards a depleted zone are observed in all LBE-experiments. At 500 and 550 °C, the 316L austeinitic steel ruptured much earlier in LBE than in air, while at 450 °C the specimens were still in-tact after long-term testing in LBE (7,178 h) and air (5,783 h). Dissolution of the steel in LBE at 550 and 500 °C is detected to localize close to the failure and unaffected steel surface close to the screw head of the cylindrical creep specimens where creep rate is comparatively low, while at 450 °C, a surface of the whole LBE-specimen is dissolved in liquid metal during a long-term LBE-test. Reference air-specimens show an insignificant surface oxidation at 450–550 °C and creep rate at least one order lower than for the LBE-specimens. Liquid metal embrittlement effect was not observed in 316L tested in LBE.
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