In order to explain the influence of carbon on the embrittlement of 12%Cr steels, a systematic study of the effects of tempering on AISI 410 steel was carried out. Reversible temper embrittlement was detected and related to the mechanical properties and microstructural variations and to the segregation of carbon and alloy elements. Carbon was directly localized on samples using high-resolution autoradiography and was detected whatever its chemical state (in solution or as precipitates). It was observed that embrittlement was associated with the concentration of carbon in solid solution at martensitic lath interfaces but also with a decrease in the elemental carbon content of the prior austenitic interfaces.
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