Abstract
The low cycle fatigue properties of a newly developed low activation austenitic stainless steel, the IF-B alloy for fusion reactor first wall components, have been determined at 450°C. The results are analysed and compared with those of AISI 316L and AMCR-0033 alloys. The fatigue life of the IF-B alloy is better than AISI 316L below a total strain range of 1.5% and better than AMCR-0033 in the whole testing range. The presence of a marked strain hardening is observed which saturates at different values of stress and number of cycles depending on the total strain range imposed. The analysis of fracture surfaces by scanning electron microscopy shows that crack initiation occurs on the surface of the specimens and propagates in the transgranular mode with the presence of fatigue striations.
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