• Lecis, Nora
• Montipò, Luigi
• Mariani, Marco

Abstract

<jats:p>Binder jetting is a sinter-based technique that allows the production of application-oriented designs with a reduced consumption of raw materials. The employment of powders from scrap metal recycling would minimise the lifecycle impact of the process. In our work, gas atomised powders tailored for binder jetting are compared to a feedstock obtained by recycling of 316L waste. The morphological features of particles, especially sphericity and size distribution, are measured by granulometry and scanning electron microscopy. Printed components are studied at the green and sintered state to observe the influence of each feedstock and the comparative analyses on density and final microstructures (residual porosity, grain size and phases distribution) allows to determine which are the most beneficial properties of the powders. CALPHAD modelling highlights the feedstock chemical composition effects on densification mechanisms: Ni and C content are responsible for δ phase formation and solidus temperature, thus affecting diffusive processes during sintering.</jats:p>

Topics

• density
• impedance spectroscopy
• morphology
• grain
• stainless steel
• grain size
• phase
• scanning electron microscopy
• chemical composition
• porosity
• sintering
• densification
• binder jetting
• CALPHAD