Study on Liquid Metal Embrittlement of Carbon Steels (Report 1) : Penetration Behavior of Liquid Metal(Welding Physics, Processes & Instruments)

概要

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The effect of penetration of liquid metal on the flow stress and fracture properties of LME of carbon steels by Cd-5Zn, Cd-50Zn and pure Cd has been studided. Using smooth and notched speciments, experiments were conducted just abobe the melting points of the emrittlers, at 350℃, and crosshead rate in a tensile test was 5mm/min. It is shown that apart from the reduction in ductility the stress-strain curves are slightly altered due to the grain boundary penetration of liquid metals. The results of tensile test with notched specimen also indicate that for the occurrence of LME, the stress or load has to exceed a critical value. Moreover, the mean penetration length at fracture could be estimated, assuming that the fracture stress of steel with liquid metal equals the ultimate stress (i.e. actual stress) without liquid metal. The data suggest that such LME is evaluated by the mean penetration length.
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