Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel
Source abstract
Abstract
Abstract The low cycle fatigue behaviour of a 9Cr1MoNbV martensitic steel has been investigated at 350 °C in air and in lead–bismuth eutectic (LBE) with low and high oxygen content. Total strain controlled tests were performed from Δet = 0.40% to 1.2%. The material exhibited a pronounced cyclic softening in both environments. LBE reduced the fatigue resistance. LBE accelerated the formation of the long crack by promoting the growth of the first short cracks. A clear change in propagation mode was observed. In air, ductile fatigue striations were observed while in LBE a brittle fracture decorated by voluminous and largely spaced striations were visible. From EBSD analysis, it was concluded that in LBE, the long crack advanced quickly by repeated and discontinuous cleavage.
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Research context
OpenAlex topics: High Temperature Alloys and Creep · Metallurgical Processes and Thermodynamics · Nuclear Materials and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
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