Authors:
Shandra Sainz (CEIT, Spain),
Odei Ruiz (CEIT, Spain),
Iñigo Iturriza (CEIT, Spain),
Brian Kernan (Desktop Metal, USA),
Ashley Morishige (Desktop Metal, USA),
Steve Hudelson (Desktop Metal, USA),
Francois Dary (Desktop Metal, USA)
Abstract:
Single Pass JettingTM technology was explored using the Desktop Metal’s Production SystemTM P-1 to develop a 440C stainless steel with Nb addition. A MIM powder grade was used as the raw material and the complete process towards its densification has been defined, from the selection of the appropriate powder conditioning and printing parameters to the identification of the sintering and heat-treating cycles considering metallurgical criteria. On those grounds, C and Nb content as well as the sintering atmosphere play a critical role. Chemical analysis and metallographic characterization were performed to analyse the evolution of the porosity and the microstructure. The steps of the heat treatment were selected based on retained austenite monitoring and a target hardness of 58±1 HRC. Testing samples were printed to evaluate the tensile and impact properties of the alloy against Standard MPIF35 .
DOI:
https://doi.org/10.59499/WP225372017