Liquid metal embrittlement of an austenitic 316L type and a ferritic-martensitic T91 type steel by mercury |
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Authors: | L. Medina-Almazá n,T. Auger,D. Gorse |
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Affiliation: | Centre d’Etude’s de Chimie Métallurgique UPR-CNRS 2801, 15 rue Georges Urbain, 94407 Vitry sur Seine cedex, France |
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Abstract: | The susceptibility to liquid metal embrittlement (LME) of 316L and T91 steels by mercury has been studied at room temperature. A dedicated experimental device using center crack tension (CCT) specimens was built. We developed a specimen preparation procedure that must be rigorously applied in order to investigate the embrittling effect of Hg. The high strength ferritic-martensitic steel of type T91 is embrittled by Hg at room temperature over a large range of crosshead speeds, between 6.67 × 10−7 and 6.67 × 10−3 m s−1. More surprisingly, the austenitic steel of type 316L is also embrittled by Hg between 1.67 × 10−8 and 2.5 × 10−4 m s−1. The fracture of the T91 and 316L CCT specimens in contact with Hg occurs by shear band decohesion over the above-mentioned range of crosshead speeds. |
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