Strain-rate dependent fatigue behavior of T91 steel at 550 °C of liquid lead-bismuth eutectic
Source abstract
Abstract
Low cycle fatigue behavior of T91 steel was investigated in oxygen saturated liquid lead-bismuth eutectic (LBE) at 550 °C with different strain rates. The fatigue life of T91 steel decreases by about 85 % with decreasing strain rate from 0.4 % to 0.004 %/s. The crack tip was carefully analyzed by advanced characterization. The intergranular oxidation resistance of T91 steel decreases at lower strain rates, leading to fatigue failure mode changes from quasi-cleavage to cleavage cracking. Notably, the cracks (>200 μm) propagate along the recrystallization grain boundaries with Pb/Bi segregation but without oxides detected at 0.004 %/s.
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Research context
OpenAlex topics: Nuclear Materials and Properties · Thermodynamic and Structural Properties of Metals and Alloys · Nuclear reactor physics and engineering
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References (38)
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