Grain boundary susceptibility to liquid metal embrittlement during wire arc additive manufacturing of a bronze/stainless steel bimetallic structure
Mahdi Mahmoudiniya (Universiteit Gent)
Marcel Hermans (TU Delft - Team Marcel Hermans)
Leo A I Kestens (TU Delft - Team Maria Santofimia Navarro, Universiteit Gent)
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Abstract
In the present study, the crystallography aspects of the liquid metal embrittlement (LME) phenomenon are investigated in a bi-metallic bronze-stainless steel structure, produced using wire arc additive manufacturing. Most of the LME cracks were found to be propagated along high-angle grain boundaries of the austenitic structure. Surprisingly, it was observed that in some cases, LME cracks propagated transgranularly in austenite grains, which is a rare phenomenon in LME of steels. The Ʃ3-coincidence site lattice (CLS) boundaries showed the highest resistance to LME compared to other CLS types. It was also found that the presence of elongated grains in additively manufactured microstructures can accelerate the LME phenomenon.
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