Zeinab Jafari
The Influence of Boron Nitride(BN) Additives on the Microstructure and Mechanical Properties of 316L Stainless Steel Processed via Selective Laser Melting.
Rel. Abdollah Saboori. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Dei Materiali Per L'Industria 4.0, 2025
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Abstract
Metal Additive Manufacturing (AM) has transformed the production of metallic components by enabling the fabrication of complex geometries with exceptional precision. Among the available AM techniques, Laser Powder Bed Fusion (L-PBF) is one of the most widely adopted, offering not only high dimensional accuracy and design flexibility but also the possibility of developing novel alloys and metal matrix composites. AISI 316L stainless steel is frequently processed by L-PBF due to its excellent corrosion resistance and ductility. However, its relatively low hardness and limited wear resistance restrict its use in more demanding applications. To overcome these limitations, this study explores the incorporation of hexagonal boron nitride (BN) as a reinforcing phase to tailor the microstructure and enhance the mechanical properties of L-PBF 316L parts.
Microstructural analysis conducted through optical microscopy (OM) and scanning electron microscopy (SEM) revealed distinct changes in grain morphology and the occurrence of solidification cracks, largely associated with the rapid cooling inherent to the L-PBF process
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